Unit Test Cases For YANG Io

Change-Id: Ie8876c25e4a293c52ae4c135921b7fe168f5f7c1
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
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+++ b/src/test/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtilTest.java
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+/*
+ * 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();
+    }
+}