Unit Test Cases For YANG Io

Change-Id: Ie8876c25e4a293c52ae4c135921b7fe168f5f7c1
diff --git a/src/test/java/org/onosproject/yangutils/utils/UtilConstantsTest.java b/src/test/java/org/onosproject/yangutils/utils/UtilConstantsTest.java
new file mode 100644
index 0000000..347dfdb
--- /dev/null
+++ b/src/test/java/org/onosproject/yangutils/utils/UtilConstantsTest.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils;
+
+import org.junit.Test;
+import org.junit.Rule;
+import org.junit.rules.ExpectedException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * Test case for testing the util constants.
+ */
+public final class UtilConstantsTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * A private constructor is tested.
+     *
+     * @throws SecurityException if any security violation is observed.
+     * @throws NoSuchMethodException if when the method is not found.
+     * @throws IllegalArgumentException if there is illegal argument found.
+     * @throws InstantiationException if instantiation is provoked for the private constructor.
+     * @throws IllegalAccessException if instance is provoked or a method is provoked.
+     * @throws InvocationTargetException when an exception occurs by the method or constructor.
+     */
+    @Test
+    public void callPrivateConstructors() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+    InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {UtilConstants.class};
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertNotNull(constructor.newInstance());
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeaderTest.java b/src/test/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeaderTest.java
new file mode 100644
index 0000000..032c483
--- /dev/null
+++ b/src/test/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeaderTest.java
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import org.junit.Test;
+import org.junit.Rule;
+import org.junit.rules.ExpectedException;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertNotNull;
+import org.slf4j.Logger;
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * Unit Tests for the CopyrightHeader contents.
+ */
+public final class CopyrightHeaderTest {
+
+    private final Logger log = getLogger(getClass());
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * Unit test for testing private constructor.
+     *
+     * @throws SecurityException if any security violation is observed.
+     * @throws NoSuchMethodException if when the method is not found.
+     * @throws IllegalArgumentException if there is illegal argument found.
+     * @throws InstantiationException if instantiation is provoked for the private constructor.
+     * @throws IllegalAccessException if instance is provoked or a method is provoked.
+     * @throws InvocationTargetException when an exception occurs by the method or constructor.
+     */
+    @Test
+    public void callPrivateConstructors() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+    InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {CopyrightHeader.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertNotNull(constructor.newInstance());
+        }
+    }
+
+    /**
+     * This test case checks the received copyright header contents.
+     */
+    @Test
+    public void testGetCopyrightHeader() throws IOException {
+
+        CopyrightHeader.parseCopyrightHeader();
+        String licenseHeader = CopyrightHeader.getCopyrightHeader();
+        ClassLoader classLoader = CopyrightHeaderTest.class.getClassLoader();
+        File test = new File("target/TestCopyrightHeader.txt");
+
+        FileWriter out = new FileWriter(test);
+        out.write(licenseHeader);
+        out.close();
+
+        File temp = new File("target/temp.txt");
+        InputStream stream = classLoader.getResourceAsStream("CopyrightHeader.txt");
+        OutputStream outStream = new FileOutputStream(temp);
+        int i;
+        while ((i = stream.read()) != -1) {
+            outStream.write(i);
+        }
+        outStream.close();
+        stream.close();
+
+        BufferedReader br1 = new BufferedReader(new FileReader(test));
+        BufferedReader br2 = new BufferedReader(new FileReader(temp));
+        while (br1.readLine() != null && br2.readLine() != null) {
+            assertThat(true, is((br1.readLine()).equals(br2.readLine())));
+        }
+        br1.close();
+        br2.close();
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtilTest.java b/src/test/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtilTest.java
new file mode 100644
index 0000000..531e739
--- /dev/null
+++ b/src/test/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtilTest.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import org.junit.Test;
+import org.junit.Rule;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.translator.GeneratedFileType;
+import org.onosproject.yangutils.utils.UtilConstants;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import org.slf4j.Logger;
+import static org.slf4j.LoggerFactory.getLogger;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
+
+/**
+ * Tests the file handle utilities.
+ */
+public final class FileSystemUtilTest {
+
+    public static String baseDirPkg = "target.UnitTestCase.";
+    public static String packageInfoContent = "testGeneration6";
+    public static String baseDir = "target/UnitTestCase";
+
+    private final Logger log = getLogger(getClass());
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * A private constructor is tested.
+     *
+     * @throws SecurityException if any security violation is observed.
+     * @throws NoSuchMethodException if when the method is not found.
+     * @throws IllegalArgumentException if there is illegal argument found.
+     * @throws InstantiationException if instantiation is provoked for the private constructor.
+     * @throws IllegalAccessException if instance is provoked or a method is provoked.
+     * @throws InvocationTargetException when an exception occurs by the method or constructor.
+     */
+    @Test
+    public void callPrivateConstructors() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+    InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {FileSystemUtil.class};
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertNotNull(constructor.newInstance());
+        }
+    }
+
+    /**
+     * This test case checks the creation of source files.
+     */
+    @Test
+    public void createSourceFilesTest() throws IOException {
+
+        FileSystemUtil.createSourceFiles(baseDirPkg + "srcFile1", packageInfoContent, GeneratedFileType.INTERFACE);
+    }
+
+    /**
+     * This test case checks the contents to be written in the file.
+     */
+    @Test
+    public void insertStringInFileTest() throws IOException {
+        File dir = new File(baseDir + File.separator + "File1");
+        dir.mkdirs();
+        File createFile = new File(dir + "testFile");
+        createFile.createNewFile();
+        File createSourceFile = new File(dir + "sourceTestFile");
+        createSourceFile.createNewFile();
+        FileSystemUtil.insertStringInFile(createFile, "This is to append a text to the file first1\n");
+        FileSystemUtil.insertStringInFile(createFile, "This is next second line\n");
+        FileSystemUtil.insertStringInFile(createFile, "This is next third line in the file");
+        FileSystemUtil.appendFileContents(createFile, createSourceFile);
+    }
+
+    /**
+     * This test  case checks whether the package is existing.
+     */
+    @Test
+    public void packageExistTest() throws IOException {
+        String dirPath = "exist1.exist2.exist3";
+        String strPath = baseDirPkg + dirPath;
+        File createDir = new File(strPath.replace(UtilConstants.PERIOD, UtilConstants.SLASH));
+        createDir.mkdirs();
+        File createFile = new File(createDir + File.separator + "package-info.java");
+        createFile.createNewFile();
+        assertTrue(FileSystemUtil.doesPackageExist(strPath));
+        FileSystemUtil.createPackage(strPath, packageInfoContent);
+        createDir.delete();
+    }
+
+    /**
+     * This test case checks the package does not exist.
+     */
+    @Test
+    public void packageNotExistTest() throws IOException {
+        String dirPath = "notexist1.notexist2";
+        String strPath = baseDirPkg + dirPath;
+        File createDir = new File(strPath.replace(UtilConstants.PERIOD, UtilConstants.SLASH));
+        assertFalse(FileSystemUtil.doesPackageExist(strPath));
+        createDir.mkdirs();
+        assertFalse(FileSystemUtil.doesPackageExist(strPath));
+        CopyrightHeader.parseCopyrightHeader();
+        FileSystemUtil.createPackage(strPath, packageInfoContent);
+        assertTrue(FileSystemUtil.doesPackageExist(strPath));
+        createDir.delete();
+    }
+}
diff --git a/src/test/java/org/onosproject/yangutils/utils/io/impl/JavaDocGenTest.java b/src/test/java/org/onosproject/yangutils/utils/io/impl/JavaDocGenTest.java
new file mode 100644
index 0000000..3e68770
--- /dev/null
+++ b/src/test/java/org/onosproject/yangutils/utils/io/impl/JavaDocGenTest.java
@@ -0,0 +1,163 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import org.junit.Test;
+import org.junit.Rule;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * Tests the java doc that is generated.
+ */
+public final class JavaDocGenTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * This test case checks the content recieved for the builder class java doc.
+     */
+    @Test
+    public void builderClassGenerationTest() {
+
+        String builderClassJavaDoc = JavaDocGen.getJavaDoc(JavaDocType.BUILDER_CLASS, "testGeneration1");
+        assertTrue(builderClassJavaDoc.contains("Provides the builder implementation of")
+                && builderClassJavaDoc.contains(" */\n"));
+    }
+
+    /**
+     * This test case checks the content recieved for the builder interface ge java doc.
+     */
+    @Test
+    public void builderInterfaceGenerationTest() {
+
+        String builderInterfaceJavaDoc = JavaDocGen.getJavaDoc(JavaDocType.BUILDER_INTERFACE, "testGeneration1");
+        assertTrue(builderInterfaceJavaDoc.contains("Builder for") && builderInterfaceJavaDoc.contains(" */\n"));
+    }
+
+    /**
+     * This test case checks the content recieved for the build  java doc.
+     */
+    @Test
+    public void buildGenerationTest() {
+
+        String buildDoc = JavaDocGen.getJavaDoc(JavaDocType.BUILD, "testGeneration1");
+        assertTrue(buildDoc.contains("Builds object of") && buildDoc.contains(" */\n"));
+    }
+
+    /**
+     * A private constructor is tested.
+     *
+     * @throws SecurityException if any security violation is observed.
+     * @throws NoSuchMethodException if when the method is not found.
+     * @throws IllegalArgumentException if there is illegal argument found.
+     * @throws InstantiationException if instantiation is provoked for the private constructor.
+     * @throws IllegalAccessException if instance is provoked or a method is provoked.
+     * @throws InvocationTargetException when an exception occurs by the method or constructor.
+     */
+    @Test
+    public void callPrivateConstructors() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+    InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {JavaDocGen.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertNotNull(constructor.newInstance());
+        }
+    }
+
+    /**
+     * This test case checks the content recieved for the constructor java doc.
+     */
+    @Test
+    public void constructorGenerationTest() {
+
+        String constructorDoc = JavaDocGen.getJavaDoc(JavaDocType.CONSTRUCTOR, "testGeneration1");
+        assertTrue(
+                constructorDoc.contains("Construct the object of") && constructorDoc.contains("builder object of")
+                && constructorDoc.contains("@param") && constructorDoc.contains("*/\n"));
+        JavaDocType.valueOf(JavaDocType.CONSTRUCTOR.toString());
+    }
+
+    /**
+     * This test case checks the content recieved for the default constructor java doc.
+     */
+    @Test
+    public void defaultConstructorGenerationTest() {
+
+        String defaultConstructorDoc = JavaDocGen.getJavaDoc(JavaDocType.DEFAULT_CONSTRUCTOR, "testGeneration1");
+        assertTrue(defaultConstructorDoc.contains("Default Constructor") && defaultConstructorDoc.contains(" */\n"));
+    }
+
+    /**
+     * This test case checks the content recieved for the getter java doc.
+     */
+    @Test
+    public void getterGenerationTest() {
+
+        String getterJavaDoc = JavaDocGen.getJavaDoc(JavaDocType.GETTER, "testGeneration1");
+        assertTrue(getterJavaDoc.contains("Returns the attribute") && getterJavaDoc.contains(" */\n"));
+    }
+
+    /**
+     * This test case checks the content recieved for the impl class java doc.
+     */
+    @Test
+    public void implClassGenerationTest() {
+        String implClassJavaDoc = JavaDocGen.getJavaDoc(JavaDocType.IMPL_CLASS, "testGeneration1");
+        assertTrue(implClassJavaDoc.contains("Provides the implementation of") && implClassJavaDoc.contains(" */\n"));
+    }
+
+    /**
+     * This test case checks the content recieved for the interface java doc.
+     */
+    @Test
+    public void interfaceGenerationTest() {
+
+        String interfaceJavaDoc = JavaDocGen.getJavaDoc(JavaDocType.INTERFACE, "testGeneration1");
+        assertTrue(interfaceJavaDoc.contains("Abstraction of an entity which provides functionalities of")
+                && interfaceJavaDoc.contains(" */\n"));
+    }
+
+    /**
+     * This test case checks the content recieved for the package info  java doc.
+     */
+    @Test
+    public void packageInfoGenerationTest() {
+
+        String packageInfo = JavaDocGen.getJavaDoc(JavaDocType.PACKAGE_INFO, "testGeneration1");
+        assertTrue(packageInfo.contains("Generated java code for the YANG file") && packageInfo.contains(" */\n"));
+    }
+
+    /**
+     * This test case checks the content recieved for the setter java doc.
+     */
+    @Test
+    public void setterGenerationTest() {
+
+        String setterJavaDoc = JavaDocGen.getJavaDoc(JavaDocType.SETTER, "testGeneration1");
+        assertTrue(setterJavaDoc.contains("Returns the builder object of") && setterJavaDoc.contains(" */\n"));
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/org/onosproject/yangutils/utils/io/impl/SerializedDataStoreTest.java b/src/test/java/org/onosproject/yangutils/utils/io/impl/SerializedDataStoreTest.java
new file mode 100644
index 0000000..154dcdd
--- /dev/null
+++ b/src/test/java/org/onosproject/yangutils/utils/io/impl/SerializedDataStoreTest.java
@@ -0,0 +1,156 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import org.junit.Test;
+import org.junit.Rule;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.utils.io.impl.SerializedDataStore.SerializedDataStoreType;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.LinkedList;
+import java.util.List;
+
+import org.slf4j.Logger;
+import static org.slf4j.LoggerFactory.getLogger;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * Unit tests for the serialized data store for its contents.
+ */
+public final class SerializedDataStoreTest {
+
+    private final Logger log = getLogger(getClass());
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * A private constructor is tested.
+     *
+     * @throws SecurityException if any security violation is observed.
+     * @throws NoSuchMethodException if when the method is not found.
+     * @throws IllegalArgumentException if there is illegal argument found.
+     * @throws InstantiationException if instantiation is provoked for the private constructor.
+     * @throws IllegalAccessException if instance is provoked or a method is provoked.
+     * @throws InvocationTargetException when an exception occurs by the method or constructor.
+     */
+    @Test
+    public void callPrivateConstructors() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+    InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {SerializedDataStore.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertNotNull(constructor.newInstance());
+        }
+    }
+
+    /**
+     * This test case checks the attribute info that is read and put into the list.
+     */
+    @Test
+    public void insertAttributeDataTest() throws IOException, ClassNotFoundException, FileNotFoundException {
+
+        String attributeData = "attribute content lists this";
+        SerializedDataStore.setSerializeData(attributeData, SerializedDataStoreType.ATTRIBUTE);
+        List<String> attributeInfo = SerializedDataStore.getSerializeData(SerializedDataStoreType.ATTRIBUTE);
+        List<String> expectedinfo = new LinkedList<>();
+        expectedinfo.add(attributeData);
+        assertThat(true, is(attributeInfo.equals(expectedinfo)));
+        SerializedDataStoreType.valueOf(SerializedDataStoreType.ATTRIBUTE.toString());
+    }
+
+    /**
+     * This test case checks the builder interface that is read and put into the list.
+     */
+    @Test
+    public void insertBuilderInterfaceMethodsTest() throws IOException, ClassNotFoundException, FileNotFoundException {
+
+        String builderInterfaceMethodsData = "builder interface methods content lists this";
+        SerializedDataStore.setSerializeData(builderInterfaceMethodsData,
+                SerializedDataStoreType.BUILDER_INTERFACE_METHODS);
+        List<String> attributeInfo = SerializedDataStore
+                .getSerializeData(SerializedDataStoreType.BUILDER_INTERFACE_METHODS);
+        List<String> expectedinfo = new LinkedList<>();
+        expectedinfo.add(builderInterfaceMethodsData);
+        assertThat(true, is(attributeInfo.equals(expectedinfo)));
+    }
+
+    /**
+     * This test case checks the builder methods that is read and put into the list.
+     */
+    @Test
+    public void insertBuilderMethodsTest() throws IOException, ClassNotFoundException, FileNotFoundException {
+
+        String builderMethodsData = "builder methods content lists this";
+        SerializedDataStore.setSerializeData(builderMethodsData, SerializedDataStoreType.BUILDER_METHODS);
+        List<String> attributeInfo = SerializedDataStore.getSerializeData(SerializedDataStoreType.BUILDER_METHODS);
+        List<String> expectedinfo = new LinkedList<>();
+        expectedinfo.add(builderMethodsData);
+        assertThat(true, is(attributeInfo.equals(expectedinfo)));
+    }
+
+    /**
+     * This test case checks the impl methods that is read and put into the list.
+     */
+    @Test
+    public void insertImplMethodsTest() throws IOException, ClassNotFoundException, FileNotFoundException {
+
+        String implMethodsData = "impl methods content lists this";
+        SerializedDataStore.setSerializeData(implMethodsData, SerializedDataStoreType.IMPL_METHODS);
+        List<String> attributeInfo = SerializedDataStore.getSerializeData(SerializedDataStoreType.IMPL_METHODS);
+        List<String> expectedinfo = new LinkedList<>();
+        expectedinfo.add(implMethodsData);
+        assertThat(true, is(attributeInfo.equals(expectedinfo)));
+    }
+
+    /**
+     * This test case checks the import methods that is read and put into the list.
+     */
+    @Test
+    public void insertImportTest() throws IOException, ClassNotFoundException, FileNotFoundException {
+
+        String importData = "interface methods content lists this";
+        SerializedDataStore.setSerializeData(importData, SerializedDataStoreType.IMPORT);
+        List<String> attributeInfo = SerializedDataStore.getSerializeData(SerializedDataStoreType.IMPORT);
+        List<String> expectedinfo = new LinkedList<>();
+        expectedinfo.add(importData);
+        assertThat(true, is(attributeInfo.equals(expectedinfo)));
+    }
+
+    /**
+     * This test case checks the interface methods that is read and put into the list.
+     */
+    @Test
+    public void insertInterfaceMethodsTest() throws IOException, ClassNotFoundException, FileNotFoundException {
+
+        String interfaceMethodsData = "interface methods content lists this";
+        SerializedDataStore.setSerializeData(interfaceMethodsData, SerializedDataStoreType.INTERFACE_METHODS);
+        List<String> attributeInfo = SerializedDataStore.getSerializeData(SerializedDataStoreType.INTERFACE_METHODS);
+        List<String> expectedinfo = new LinkedList<>();
+        expectedinfo.add(interfaceMethodsData);
+        assertThat(true, is(attributeInfo.equals(expectedinfo)));
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/org/onosproject/yangutils/utils/io/impl/YangFileScannerTest.java b/src/test/java/org/onosproject/yangutils/utils/io/impl/YangFileScannerTest.java
index 6ead5e3..6441b19 100644
--- a/src/test/java/org/onosproject/yangutils/utils/io/impl/YangFileScannerTest.java
+++ b/src/test/java/org/onosproject/yangutils/utils/io/impl/YangFileScannerTest.java
@@ -16,189 +16,80 @@
 
 package org.onosproject.yangutils.utils.io.impl;
 
+import org.junit.Test;
+import org.junit.Rule;
+import org.junit.rules.ExpectedException;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertEquals;
+
+import java.io.File;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.LinkedList;
+import java.util.List;
 import java.io.IOException;
 
-import org.junit.Test;
-import java.io.File;
-import java.util.List;
 import org.slf4j.Logger;
 import static org.slf4j.LoggerFactory.getLogger;
 
 /**
- * Unit tests for searching yang files.
+ * Test the file scanner service.
  */
-public class YangFileScannerTest {
+public final class YangFileScannerTest {
 
     private final Logger log = getLogger(getClass());
 
-    private static final String BASEDIR = "target/UnitTestCase";
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    String baseDir = "target/UnitTestCase";
 
     /**
-     * Checks an empty directory.
+     * A private constructor is tested.
+     *
+     * @throws SecurityException if any security violation is observed.
+     * @throws NoSuchMethodException if when the method is not found.
+     * @throws IllegalArgumentException if there is illegal argument found.
+     * @throws InstantiationException if instantiation is provoked for the private constructor.
+     * @throws IllegalAccessException if instance is provoked or a method is provoked.
+     * @throws InvocationTargetException when an exception occurs by the method or constructor.
      */
     @Test
-    public void testWithSingleEmptyDirectoryInRoot() {
-        try {
-            File dir = new File(BASEDIR);
-            dir.mkdirs();
-            List<String> list = YangFileScanner.getYangFiles(BASEDIR.toString());
-        } catch (IOException e) {
-            log.info("IO Exception throwed");
+    public void callPrivateConstructors() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+    InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {YangFileScanner.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertNotNull(constructor.newInstance());
         }
     }
 
     /**
-     * Checks multiple empty directories in root directory.
+     * This test case checks for a .java file inside the specified dir.
      */
     @Test
-    public void testWithMultiEmptyDirectoriesInRoot() {
-        try {
-            String dir = "emptyDir";
-            String dir1 = "emptyDir1";
-            String dir2 = "emptyDir2";
-            String dir3 = "emptyDir3";
-            String dir4 = "emptyDir4";
-            File firstpath = createDirectory(dir);
-            File firstpath1 = createDirectory(dir1);
-            File firstpath2 = createDirectory(dir2);
-            File firstpath3 = createDirectory(dir3);
-            File firstpath4 = createDirectory(dir4);
-            List<String> list = YangFileScanner.getYangFiles(BASEDIR.toString());
-        } catch (IOException e) {
-            log.info("IO Exception throwed");
-        }
-    }
+    public void checkJavaFileInsideDirTest() throws IOException {
 
-    /**
-     * Checks one directory with one .yang file.
-     */
-    @Test
-    public void testWithSingleDirectorySingleFileInRoot() {
-        try {
-            String dir1 = "level1";
-            String firstFileName1 = "secondFile.yang";
-            File firstpath1 = createDirectory(dir1);
-            createFile(firstpath1, firstFileName1);
-            List<String> list = YangFileScanner.getYangFiles(BASEDIR.toString());
-        } catch (IOException e) {
-            log.info("IO Exception throwed");
-        }
-    }
-
-    /**
-     * Checks one directory with many .yang file.
-     */
-    @Test
-    public void testWithSingleDirectoryMultiFilesInRoot() {
-        try {
-            String dir2 = "level2";
-            String firstFileName2 = "thirdFile.yang";
-            String firstFileName3 = "fourthFile.yang";
-            String firstFileName4 = "fifthFile.yang";
-            String firstFileName5 = "sixthFile.yang";
-            File firstpath2 = createDirectory(dir2);
-            createFile(firstpath2, firstFileName2);
-            createFile(firstpath2, firstFileName3);
-            createFile(firstpath2, firstFileName4);
-            createFile(firstpath2, firstFileName5);
-            List<String> list = YangFileScanner.getYangFiles(BASEDIR.toString());
-        } catch (IOException e) {
-            log.info("IO Exception throwed");
-        }
-    }
-
-    /**
-     * Checks multi directories with many .yang file.
-     */
-    @Test
-    public void testWithMultiDirectoriesMultiFiles() {
-        try {
-            String dir2 = "newDir1/newDir2/newDir3/newDir4";
-            File dir3 = new File("target/UnitTestCase/newDir1");
-            File dir4 = new File("target/UnitTestCase/newDir1/newDir2");
-            File dir5 = new File("target/UnitTestCase/newDir1/newDir2/newDir3");
-            File dir6 = new File("target/UnitTestCase/newDir1/newDir2/newDir3/newDir4");
-            String firstFileName2 = "thirdFile.yang";
-            String firstFileName3 = "fourthFile.yang";
-            String firstFileName4 = "fifthFile.yang";
-            String firstFileName5 = "sixthFile.yang";
-            File firstpath2 = createDirectory(dir2);
-            createFile(firstpath2, firstFileName2);
-            createFile(firstpath2, firstFileName3);
-            createFile(firstpath2, firstFileName4);
-            createFile(dir3, firstFileName5);
-            createFile(dir3, firstFileName2);
-            createFile(dir3, firstFileName3);
-            createFile(dir3, firstFileName4);
-            createFile(dir3, firstFileName5);
-            createFile(dir4, firstFileName2);
-            createFile(dir4, firstFileName3);
-            createFile(dir4, firstFileName4);
-            createFile(dir4, firstFileName5);
-            createFile(dir5, firstFileName2);
-            createFile(dir5, firstFileName3);
-            createFile(dir5, firstFileName4);
-            createFile(dir5, firstFileName5);
-            createFile(dir6, firstFileName2);
-            createFile(dir6, firstFileName3);
-            createFile(dir6, firstFileName4);
-            createFile(dir6, firstFileName5);
-            List<String> list = YangFileScanner.getYangFiles(BASEDIR.toString());
-        } catch (IOException e) {
-            log.info("IO Exception throwed");
-        }
-    }
-
-    /**
-     * Checks multi directories with many .java file.
-     */
-    @Test
-    public void testWithMultiDirectoriesMultiJavaFiles() {
-        try {
-            String dir2 = "newDir1/newDir2/newDir3/newDir4";
-            File dir3 = new File("target/UnitTestCase/newDir1");
-            File dir4 = new File("target/UnitTestCase/newDir1/newDir2");
-            File dir5 = new File("target/UnitTestCase/newDir1/newDir2/newDir3");
-            File dir6 = new File("target/UnitTestCase/newDir1/newDir2/newDir3/newDir4");
-            String firstFileName2 = "thirdFile.java";
-            String firstFileName3 = "fourthFile.java";
-            String firstFileName4 = "fifthFile.java";
-            String firstFileName5 = "sixthFile.java";
-            File firstpath2 = createDirectory(dir2);
-            createFile(firstpath2, firstFileName2);
-            createFile(firstpath2, firstFileName3);
-            createFile(firstpath2, firstFileName4);
-            createFile(dir3, firstFileName5);
-            createFile(dir3, firstFileName2);
-            createFile(dir3, firstFileName3);
-            createFile(dir3, firstFileName4);
-            createFile(dir3, firstFileName5);
-            createFile(dir4, firstFileName2);
-            createFile(dir4, firstFileName3);
-            createFile(dir4, firstFileName4);
-            createFile(dir4, firstFileName5);
-            createFile(dir5, firstFileName2);
-            createFile(dir5, firstFileName3);
-            createFile(dir5, firstFileName4);
-            createFile(dir5, firstFileName5);
-            createFile(dir6, firstFileName2);
-            createFile(dir6, firstFileName3);
-            createFile(dir6, firstFileName4);
-            createFile(dir6, firstFileName5);
-            List<String> list = YangFileScanner.getJavaFiles(BASEDIR.toString());
-        } catch (IOException e) {
-            log.info("IO Exception throwed");
-        }
+        String dir = baseDir + File.separator + "scanner2";
+        File path = createDirectory(dir);
+        createFile(path, "testScanner.java");
+        List<String> dirContents = YangFileScanner.getJavaFiles(path.toString());
+        List<String> expectedContents = new LinkedList<>();
+        expectedContents.add(path.getCanonicalPath() + File.separator + "testScanner.java");
+        assertEquals(dirContents, expectedContents);
     }
 
     /**
      * Method used for creating multiple directories inside the target file.
      *
-     * @param path directory path
-     * @return directory path
+     * @param path where directories should be created.
+     * @return
      */
     public File createDirectory(String path) {
-        File myDir = new File(BASEDIR + File.separator + path);
+
+        File myDir = new File(path);
         myDir.mkdirs();
         return myDir;
     }
@@ -206,17 +97,71 @@
     /**
      * Method used for creating file inside the specified directory.
      *
-     * @param myDir my current dirctory
-     * @param fileName file name
-     * @throws IOException io exception when fails to create a file.
+     * @param myDir the path where file has to be created inside.
+     * @param fileName the name of the file to be created.
      */
     public void createFile(File myDir, String fileName) throws IOException {
+
         File file = null;
-        try {
-            file = new File(myDir + File.separator + fileName);
-            file.createNewFile();
-        } catch (final IOException e) {
-            throw new IOException("IOException occured");
-        }
+        file = new File(myDir + File.separator + fileName);
+        file.createNewFile();
     }
-}
+
+    /**
+     * This testcase checks for a java file inside an empty directory.
+     */
+    @Test
+    public void emptyDirJavaScannerTest() throws IOException {
+
+        String emptyDir = baseDir + File.separator + "scanner1";
+        File path = createDirectory(emptyDir);
+        List<String> emptyDirContents = YangFileScanner.getJavaFiles(path.toString());
+        List<String> expectedContents = new LinkedList<>();
+        assertEquals(emptyDirContents, expectedContents);
+    }
+
+    /**
+     * This testcase checks for a yang file inside an empty directory.
+     */
+    @Test
+    public void emptyDirYangScannerTest() throws IOException {
+
+        String emptyYangDir = baseDir + File.separator + "scanner1";
+        File path = createDirectory(emptyYangDir);
+        List<String> emptyDirContents = YangFileScanner.getYangFiles(path.toString());
+        List<String> expectedContents = new LinkedList<>();
+        assertEquals(emptyDirContents, expectedContents);
+    }
+
+    /**
+     * This test case checks with the sub directories in the given path for java files.
+     */
+    @Test
+    public void emptySubDirScannerTest() throws IOException {
+
+        String dir = baseDir + File.separator + "scanner3";
+        File path = createDirectory(dir);
+        String subDir = path.toString() + File.separator + "subDir1";
+        createDirectory(subDir);
+        createFile(path, "invalidFile.txt");
+        List<String> emptySubDirContents = YangFileScanner.getJavaFiles(path.toString());
+        List<String> expectedContents = new LinkedList<>();
+        assertEquals(emptySubDirContents, expectedContents);
+    }
+
+    /**
+     * This test case checks with the sub directories in the given path for java files.
+     */
+    @Test
+    public void exceptionHandleTest() throws IOException {
+
+        String dir = baseDir + File.separator + "scanner4";
+        thrown.expect(IOException.class);
+        thrown.expectMessage("NullPointerException occured");
+        List<String> invalidContents = YangFileScanner.getJavaFiles(dir);
+        File path = createDirectory(dir);
+        createFile(path, "except.java");
+        List<String> dirWithFileName = YangFileScanner
+                .getJavaFiles(path + File.separator + "except.java" + File.separator + "scanner5");
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/org/onosproject/yangutils/utils/io/impl/YangIoUtilsTest.java b/src/test/java/org/onosproject/yangutils/utils/io/impl/YangIoUtilsTest.java
new file mode 100644
index 0000000..a7e9860
--- /dev/null
+++ b/src/test/java/org/onosproject/yangutils/utils/io/impl/YangIoUtilsTest.java
@@ -0,0 +1,149 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import org.junit.Test;
+import org.junit.Rule;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.utils.UtilConstants;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.apache.maven.project.MavenProject;
+import org.sonatype.plexus.build.incremental.BuildContext;
+import org.sonatype.plexus.build.incremental.DefaultBuildContext;
+
+import org.slf4j.Logger;
+import static org.slf4j.LoggerFactory.getLogger;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertNotNull;
+import static org.hamcrest.core.Is.is;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * Unit tests for adding package-info, creating directories, cleaning the folder and to add sources.
+ */
+public final class YangIoUtilsTest {
+
+    public static String baseDir = "target/UnitTestCase";
+
+    public static String createPath = baseDir + File.separator + "dir1/dir2/dir3/dir4/";
+
+    private final Logger log = getLogger(getClass());
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * This test case checks whether the package-info file is created.
+     */
+    @Test
+    public void addPackageInfoTest() throws IOException {
+
+        File dirPath = new File(createPath);
+        dirPath.mkdirs();
+        CopyrightHeader.parseCopyrightHeader();
+        YangIoUtils.addPackageInfo(dirPath, "check1", createPath);
+        File filePath = new File(dirPath + File.separator + "package-info.java");
+        assertThat(filePath.isFile(), is(true));
+    }
+
+    /**
+     * This test case checks whether the package-info file is created when invalid path is given.
+     */
+    @Test
+    public void addPackageInfoWithEmptyPathTest() throws IOException {
+
+        File dirPath = new File("");
+        thrown.expect(IOException.class);
+        thrown.expectMessage("Exception occured while creating package info file.");
+        YangIoUtils.addPackageInfo(dirPath, "check1", createPath);
+        File filePath1 = new File(dirPath + File.separator + "package-info.java");
+        assertThat(filePath1.isFile(), is(false));
+    }
+
+    /**
+     * A private constructor is tested.
+     *
+     * @throws SecurityException if any security violation is observed.
+     * @throws NoSuchMethodException if when the method is not found.
+     * @throws IllegalArgumentException if there is illegal argument found.
+     * @throws InstantiationException if instantiation is provoked for the private constructor.
+     * @throws IllegalAccessException if instance is provoked or a method is provoked.
+     * @throws InvocationTargetException when an exception occurs by the method or constructor.
+     */
+    @Test
+    public void callPrivateConstructors() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+    InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {YangIoUtils.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertNotNull(constructor.newInstance());
+        }
+    }
+
+    /**
+     * This test case checks if the directory is cleaned.
+     */
+    @Test
+    public void cleanGeneratedDirTest() throws IOException {
+
+        File baseDirPath = new File(baseDir);
+        File createNewDir = new File(baseDir + File.separator + UtilConstants.YANG_GEN_DIR);
+        createNewDir.mkdirs();
+        File createFile = new File(createNewDir + File.separator + "check1.java");
+        createFile.createNewFile();
+        YangIoUtils.clean(baseDirPath.getAbsolutePath());
+    }
+
+    /**
+     * This test case checks the cleaning method when an invalid path is provided.
+     */
+    @Test
+    public void cleanWithInvalidDirTest() throws IOException {
+
+        File baseDirPath = new File(baseDir + "invalid");
+        YangIoUtils.clean(baseDirPath.getAbsolutePath());
+    }
+
+    /**
+     * This test case tests whether the directories are getting created.
+     */
+    @Test
+    public void createDirectoryTest() {
+
+        File dirPath = YangIoUtils.createDirectories(createPath);
+        assertThat(dirPath.isDirectory(), is(true));
+    }
+
+    /**
+     * This testcase checks whether the source is getting added.
+     */
+    @Test
+    public void testForAddSource() {
+
+        MavenProject project = new MavenProject();
+        BuildContext context = new DefaultBuildContext();
+        File sourceDir = new File(baseDir + File.separator + "yang");
+        sourceDir.mkdirs();
+        YangIoUtils.addToSource(sourceDir.toString(), project, context);
+    }
+}
\ No newline at end of file
diff --git a/src/test/resources/CopyrightHeader.txt b/src/test/resources/CopyrightHeader.txt
new file mode 100644
index 0000000..ca214a2
--- /dev/null
+++ b/src/test/resources/CopyrightHeader.txt
@@ -0,0 +1,16 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+