ONOS-542 Defining application subsystem interfaces & public constructs.

Change-Id: Iba0d2cb69dace5beee8a68def9918059ce755b5c
diff --git a/core/api/src/test/java/org/onosproject/core/ApplicationIdStoreAdapter.java b/core/api/src/test/java/org/onosproject/core/ApplicationIdStoreAdapter.java
new file mode 100644
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+++ b/core/api/src/test/java/org/onosproject/core/ApplicationIdStoreAdapter.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2015 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.core;
+
+import java.util.Set;
+
+/**
+ * Adapter for testing against app id store.
+ */
+public class ApplicationIdStoreAdapter implements ApplicationIdStore {
+    @Override
+    public Set<ApplicationId> getAppIds() {
+        return null;
+    }
+
+    @Override
+    public ApplicationId getAppId(Short id) {
+        return null;
+    }
+
+    @Override
+    public ApplicationId getAppId(String name) {
+        return null;
+    }
+
+    @Override
+    public ApplicationId registerApplication(String identifier) {
+        return null;
+    }
+}
diff --git a/core/api/src/test/java/org/onosproject/core/DefaultApplicationTest.java b/core/api/src/test/java/org/onosproject/core/DefaultApplicationTest.java
new file mode 100644
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+++ b/core/api/src/test/java/org/onosproject/core/DefaultApplicationTest.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2015 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.core;
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Test;
+
+import java.util.Optional;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.onosproject.app.DefaultApplicationDescriptionTest.*;
+
+/**
+ * Basic tests of the default app descriptor.
+ */
+public class DefaultApplicationTest {
+
+    public static final ApplicationId APP_ID = new DefaultApplicationId(2, APP_NAME);
+
+    @Test
+    public void basics() {
+        Application app = new DefaultApplication(APP_ID, VER, DESC, ORIGIN,
+                                                 PERMS, Optional.of(FURL), FEATURES);
+        assertEquals("incorrect id", APP_ID, app.id());
+        assertEquals("incorrect version", VER, app.version());
+        assertEquals("incorrect description", DESC, app.description());
+        assertEquals("incorrect origin", ORIGIN, app.origin());
+        assertEquals("incorrect permissions", PERMS, app.permissions());
+        assertEquals("incorrect features repo", FURL, app.featuresRepo().get());
+        assertEquals("incorrect features", FEATURES, app.features());
+        assertTrue("incorrect toString", app.toString().contains(APP_NAME));
+    }
+
+    @Test
+    public void testEquality() {
+        Application a1 = new DefaultApplication(APP_ID, VER, DESC, ORIGIN,
+                                                PERMS, Optional.of(FURL), FEATURES);
+        Application a2 = new DefaultApplication(APP_ID, VER, DESC, ORIGIN,
+                                                PERMS, Optional.of(FURL), FEATURES);
+        Application a3 = new DefaultApplication(APP_ID, VER, DESC, ORIGIN,
+                                                PERMS, Optional.empty(), FEATURES);
+        Application a4 = new DefaultApplication(APP_ID, VER, DESC, ORIGIN + "asd",
+                                                PERMS, Optional.of(FURL), FEATURES);
+        new EqualsTester().addEqualityGroup(a1, a2)
+                .addEqualityGroup(a3).addEqualityGroup(a4).testEquals();
+    }
+
+}
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diff --git a/core/api/src/test/java/org/onosproject/core/UnavailableIdExceptionTest.java b/core/api/src/test/java/org/onosproject/core/UnavailableIdExceptionTest.java
new file mode 100644
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--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/core/UnavailableIdExceptionTest.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2015 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.core;
+
+import org.onlab.junit.ExceptionTest;
+
+public class UnavailableIdExceptionTest extends ExceptionTest {
+
+    @Override
+    protected Exception getDefault() {
+        return new UnavailableIdException();
+    }
+
+    @Override
+    protected Exception getWithMessage() {
+        return new UnavailableIdException(MESSAGE);
+    }
+
+    @Override
+    protected Exception getWithMessageAndCause() {
+        return new UnavailableIdException(MESSAGE, CAUSE);
+    }
+}
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