[ONOS-4839] update file priority for input files

Change-Id: I4aa0cbbfb0f168efd7c1895c9bb0c6589088eefd
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/plugin/manager/InterFileLinkingTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/plugin/manager/InterFileLinkingTest.java
index b5fd40b..09641c1 100644
--- a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/plugin/manager/InterFileLinkingTest.java
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/plugin/manager/InterFileLinkingTest.java
@@ -984,4 +984,52 @@
         assertThat(leafref.getEffectiveDataType().getDataType(),
                 is(YangDataTypes.STRING));
     }
+
+    /**
+     * Checks priority of the file.
+     */
+    @Test
+    public void interFilePriority()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfilepriority";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.resolveDependenciesUsingLinker();
+
+        YangNode selfNode = null;
+        YangNode refNode1 = null;
+        YangNode refNode2 = null;
+
+        for (YangNode rootNode : utilManager.getYangNodeSet()) {
+            if (rootNode.getName().equals("module1")) {
+                selfNode = rootNode;
+            } else if (rootNode.getName().equals("module2")) {
+                refNode1 = rootNode;
+            } else {
+                refNode2 = rootNode;
+            }
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+        assertThat(yangNode.getPriority(), is(2));
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(refNode1 instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(refNode1.getNodeType(), is(MODULE_NODE));
+
+        YangModule referredNode1 = (YangModule) refNode1;
+        assertThat(referredNode1.getName(), is("module2"));
+        assertThat(referredNode1.getPriority(), is(3));
+    }
 }
diff --git a/utils/yangutils/plugin/src/test/resources/interfilepriority/module1.yang b/utils/yangutils/plugin/src/test/resources/interfilepriority/module1.yang
new file mode 100644
index 0000000..9a21b03
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfilepriority/module1.yang
@@ -0,0 +1,14 @@
+module module1 {
+    yang-version 1;
+    namespace "http://huawei.com";
+    prefix Ant;
+    import module2 {
+        prefix p;
+    }
+    leaf invalid-interval {
+        type p:hello;
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfilepriority/module2.yang b/utils/yangutils/plugin/src/test/resources/interfilepriority/module2.yang
new file mode 100644
index 0000000..0a3bdad
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfilepriority/module2.yang
@@ -0,0 +1,8 @@
+module module2 {
+    yang-version 1;
+    namespace "http://huawei.com";
+    prefix Ant2;
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfilepriority/module3.yang b/utils/yangutils/plugin/src/test/resources/interfilepriority/module3.yang
new file mode 100644
index 0000000..948c797
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfilepriority/module3.yang
@@ -0,0 +1,8 @@
+module module3 {
+    yang-version 1;
+    namespace "http://huawei.com";
+    prefix Ant;
+    import module1 {
+        prefix p;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfilepriority/module4.yang b/utils/yangutils/plugin/src/test/resources/interfilepriority/module4.yang
new file mode 100644
index 0000000..df6f8b2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfilepriority/module4.yang
@@ -0,0 +1,8 @@
+module module4 {
+    yang-version 1;
+    namespace "http://huawei.com";
+    prefix Ant;
+    import module3 {
+        prefix p;
+    }
+}