Add unit tests for ContentTypesCallback and FetchResultCallback, verifying onRequestFinish and onRequestFail methods, ensuring correct handling of responses and errors, and testing the always callable functionality to enhance test coverage.

Author: harshithad0703

contentstack/src/test/java/com/contentstack/sdk/TestContentTypesCallback.java

@@ -0,0 +1,73 @@
+package com.contentstack.sdk;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Unit tests for ContentTypesCallback.
+ */
+public class TestContentTypesCallback {
+
+    /**
+     * Simple concrete implementation for testing.
+     */
+    private static class TestCallback extends ContentTypesCallback {
+
+        ContentTypesModel lastContentTypesModel;
+        Error lastError;
+        boolean onCompletionCalled = false;
+        boolean alwaysCalled = false;
+
+        @Override
+        public void onCompletion(ContentTypesModel contentTypesModel, Error error) {
+            onCompletionCalled = true;
+            lastContentTypesModel = contentTypesModel;
+            lastError = error;
+        }
+
+        @Override
+        public void always() {
+            alwaysCalled = true;
+        }
+    }
+
+    @Test
+    public void testOnRequestFinishCallsOnCompletionWithModelAndNullError() {
+        TestCallback callback = new TestCallback();
+        // Assuming ContentTypesModel has a public no-arg constructor
+        ContentTypesModel model = new ContentTypesModel();
+
+        callback.onRequestFinish(model);
+
+        assertTrue(callback.onCompletionCalled);
+        assertEquals(model, callback.lastContentTypesModel);
+        assertNull(callback.lastError);
+        assertFalse(callback.alwaysCalled);
+    }
+
+    @Test
+    public void testOnRequestFailCallsOnCompletionWithErrorAndNullModel() {
+        TestCallback callback = new TestCallback();
+        Error error = new Error(); // SDK Error with no-arg ctor
+
+        callback.onRequestFail(ResponseType.NETWORK, error);
+
+        assertTrue(callback.onCompletionCalled);
+        assertNull(callback.lastContentTypesModel);
+        assertEquals(error, callback.lastError);
+        assertFalse(callback.alwaysCalled);
+    }
+
+    @Test
+    public void testAlwaysCanBeOverridden() {
+        TestCallback callback = new TestCallback();
+
+        callback.always();
+
+        assertTrue(callback.alwaysCalled);
+        assertFalse(callback.onCompletionCalled);
+        assertNull(callback.lastContentTypesModel);
+        assertNull(callback.lastError);
+    }
+}

contentstack/src/test/java/com/contentstack/sdk/TestFetchResultCallback.java

@@ -0,0 +1,71 @@
+package com.contentstack.sdk;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Unit tests for FetchResultCallback.
+ */
+public class TestFetchResultCallback {
+
+    private static class TestCallback extends FetchResultCallback {
+
+        ResponseType lastResponseType;
+        Error lastError;
+        boolean onCompletionCalled = false;
+        boolean alwaysCalled = false;
+
+        @Override
+        public void onCompletion(ResponseType responseType, Error error) {
+            onCompletionCalled = true;
+            lastResponseType = responseType;
+            lastError = error;
+        }
+
+        @Override
+        public void always() {
+            alwaysCalled = true;
+        }
+    }
+
+    @Test
+    public void testOnRequestFinishCallsOnCompletionWithNullError() {
+        TestCallback callback = new TestCallback();
+        ResponseType responseType = ResponseType.NETWORK; // or CACHE, etc.
+
+        callback.onRequestFinish(responseType);
+
+        assertTrue(callback.onCompletionCalled);
+        assertEquals(responseType, callback.lastResponseType);
+        assertNull(callback.lastError);           // success => null error
+        assertFalse(callback.alwaysCalled);
+    }
+
+    @Test
+    public void testOnRequestFailCallsOnCompletionWithError() {
+        TestCallback callback = new TestCallback();
+        ResponseType responseType = ResponseType.NETWORK;
+        Error error = new Error();               // SDK Error has no-arg ctor
+
+        callback.onRequestFail(responseType, error);
+
+        assertTrue(callback.onCompletionCalled);
+        assertEquals(responseType, callback.lastResponseType);
+        assertEquals(error, callback.lastError);
+        assertFalse(callback.alwaysCalled);
+    }
+
+    @Test
+    public void testAlwaysOverrideCallable() {
+        TestCallback callback = new TestCallback();
+
+        callback.always();
+
+        assertTrue(callback.alwaysCalled);
+        // onCompletion should not be touched here
+        assertFalse(callback.onCompletionCalled);
+        assertNull(callback.lastResponseType);
+        assertNull(callback.lastError);
+    }
+}