[ONOS-4350] Inter Jar dependency implementation and code restructuring.

Change-Id: Iacac75e4187aed93ce1754c170a9c19707e5b8c3
diff --git a/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeaderTest.java b/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeaderTest.java
new file mode 100644
index 0000000..40ac92c
--- /dev/null
+++ b/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeaderTest.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2016-present 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 java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Calendar;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static org.apache.commons.io.FileUtils.contentEquals;
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.utils.io.impl.CopyrightHeader.getCopyrightHeader;
+
+/**
+ * Unit Tests for the CopyrightHeader contents.
+ */
+public final class CopyrightHeaderTest {
+
+    private static final String COPYRIGHTS_FIRST_LINE = "/*\n * Copyright " + Calendar.getInstance().get(Calendar.YEAR)
+            + "-present Open Networking Laboratory\n";
+    @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);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+
+    /**
+     * This test case checks the received copyright header contents.
+     *
+     * @throws IOException when fails to do IO operations
+     */
+    @Test
+    public void testGetCopyrightHeader() throws IOException {
+
+        String path = "src/test/resources/CopyrightHeader.txt";
+
+        File testRsc = new File(path);
+        FileInputStream in = new FileInputStream(testRsc);
+
+        File testFile = new File("target/TestHeader.txt");
+        FileOutputStream out = new FileOutputStream(testFile);
+
+        out.write(COPYRIGHTS_FIRST_LINE.getBytes());
+        int c = 0;
+        while ((c = in.read()) != -1) {
+            out.write(c);
+        }
+
+        String licenseHeader = getCopyrightHeader();
+        File test = new File("target/TestCopyrightHeader.txt");
+
+        FileWriter writer = new FileWriter(test);
+        writer.write(licenseHeader);
+        writer.close();
+        out.close();
+        out.flush();
+        in.close();
+
+        assertThat(true, is(contentEquals(test, testFile)));
+        test.delete();
+        testFile.delete();
+    }
+}
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