Add unit tests for TestQueryResultsCallBack, verifying onCompletion and always methods to ensure correct behavior and enhance test coverage.

Author: harshithad0703

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

@@ -0,0 +1,72 @@
+package com.contentstack.sdk;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class TestQueryResultsCallBack {
+
+    private static class TestQueryResultsCallback extends QueryResultsCallBack {
+
+        ResponseType lastResponseType;
+        QueryResult lastQueryResult;
+        Error lastError;
+        boolean onCompletionCalled = false;
+        boolean alwaysCalled = false;
+
+        @Override
+        public void onCompletion(ResponseType responseType, QueryResult queryresult, Error error) {
+            onCompletionCalled = true;
+            lastResponseType = responseType;
+            lastQueryResult = queryresult;
+            lastError = error;
+        }
+
+        @Override
+        void always() {
+            alwaysCalled = true;
+        }
+    }
+
+    @Test
+    public void testOnRequestFinishCallsOnCompletionWithQueryResultAndNullError() {
+        TestQueryResultsCallback callback = new TestQueryResultsCallback();
+
+        // Use any valid ResponseType constant from your SDK
+        ResponseType responseType = ResponseType.NETWORK; // change if needed
+
+        // We don't need a real QueryResult instance here; we just check behavior
+        callback.onRequestFinish(responseType, null);
+
+        assertTrue(callback.onCompletionCalled);
+        assertEquals(responseType, callback.lastResponseType);
+        assertNull(callback.lastQueryResult);  // we passed null
+        assertNull(callback.lastError);        // onRequestFinish must send null error
+        assertFalse(callback.alwaysCalled);
+    }
+
+    @Test
+    public void testOnRequestFailCallsOnCompletionWithErrorAndNullQueryResult() {
+        TestQueryResultsCallback callback = new TestQueryResultsCallback();
+
+        ResponseType responseType = ResponseType.NETWORK; // change if needed
+        Error error = new Error();                        // SDK Error with no-arg ctor
+
+        callback.onRequestFail(responseType, error);
+
+        assertTrue(callback.onCompletionCalled);
+        assertEquals(responseType, callback.lastResponseType);
+        assertNull(callback.lastQueryResult);             // must be null on failure
+        assertEquals(error, callback.lastError);
+        assertFalse(callback.alwaysCalled);
+    }
+
+    @Test
+    public void testAlwaysOverrideIsCallable() {
+        TestQueryResultsCallback callback = new TestQueryResultsCallback();
+
+        callback.always();
+
+        assertTrue(callback.alwaysCalled);
+    }
+}