[ONOS-4563][ONOS-4564][ONOS-4551][ONOS-4538]defect fix

Change-Id: Ia3fe844e1e846d2e1d2c4359eefc815e7767aef9
diff --git a/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BitListenerTest.java b/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BitListenerTest.java
index 3aceb34..6487172 100644
--- a/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BitListenerTest.java
+++ b/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BitListenerTest.java
@@ -26,10 +26,14 @@
 import org.onosproject.yangutils.datamodel.YangModule;
 import org.onosproject.yangutils.datamodel.YangNode;
 import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUnion;
 import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
 
 import java.io.IOException;
+import java.util.List;
 import java.util.ListIterator;
 import java.util.Set;
 
@@ -80,6 +84,84 @@
     }
 
     /**
+     * Checks bit statement with typedef.
+     */
+    @Test
+    public void processBitTypedefStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/BitTypedefStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangTypeDef typedef = (YangTypeDef) yangNode.getChild();
+        assertThat(typedef.getName(), is("type15"));
+
+        YangType type = typedef.getTypeList().iterator().next();
+        assertThat(type.getDataType(), is(YangDataTypes.BITS));
+        assertThat(type.getDataTypeName(), is("bits"));
+        Set<YangBit> bitSet = ((YangBits) type.getDataTypeExtendedInfo()).getBitSet();
+        for (YangBit tmp : bitSet) {
+            if (tmp.getBitName().equals("disable-nagle")) {
+                assertThat(tmp.getPosition(), is(0));
+            } else if (tmp.getBitName().equals("auto-sense-speed")) {
+                assertThat(tmp.getPosition(), is(1));
+            }
+        }
+    }
+
+    /**
+     * Checks bit statement with union.
+     */
+    @Test
+    public void processBitUnionStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/BitUnionStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("type15"));
+
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UNION));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("union"));
+
+        YangUnion yangUnion = (YangUnion) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        List<YangType<?>> typeList = yangUnion.getTypeList();
+        ListIterator<YangType<?>> typeListIterator = typeList.listIterator();
+        YangType<?> yangType = typeListIterator.next();
+
+        assertThat(yangType.getDataType(), is(YangDataTypes.BITS));
+        assertThat(yangType.getDataTypeName(), is("bits"));
+        Set<YangBit> bitSet = ((YangBits) yangType.getDataTypeExtendedInfo()).getBitSet();
+        for (YangBit tmp : bitSet) {
+            if (tmp.getBitName().equals("disable-nagle")) {
+                assertThat(tmp.getPosition(), is(0));
+            } else if (tmp.getBitName().equals("auto-sense-speed")) {
+                assertThat(tmp.getPosition(), is(1));
+            }
+        }
+    }
+
+    /**
      * Checks if enum with same name is not allowed.
      */
     @Test(expected = ParserException.class)