Add unit tests for EntryResultCallBack, 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/TestEntryResultCallBack.java

@@ -0,0 +1,83 @@
+package com.contentstack.sdk;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Unit tests for EntryResultCallBack.
+ */
+public class TestEntryResultCallBack {
+
+    @Test
+    public void testOnRequestFinishCallsOnCompletionWithNullError() {
+        class TestCallback extends EntryResultCallBack {
+            boolean finished = false;
+            ResponseType lastResponse;
+            Error lastError;
+
+            @Override
+            public void onCompletion(ResponseType responseType, Error error) {
+                finished = true;
+                lastResponse = responseType;
+                lastError = error;
+            }
+        }
+
+        TestCallback callback = new TestCallback();
+
+        ResponseType responseType = ResponseType.NETWORK; // use SDK's ResponseType
+        callback.onRequestFinish(responseType);
+
+        assertTrue(callback.finished);
+        assertEquals(responseType, callback.lastResponse);
+        assertNull(callback.lastError);
+    }
+
+    @Test
+    public void testOnRequestFailCallsOnCompletionWithError() {
+        class TestCallback extends EntryResultCallBack {
+            boolean finished = false;
+            ResponseType lastResponse;
+            Error lastError;
+
+            @Override
+            public void onCompletion(ResponseType responseType, Error error) {
+                finished = true;
+                lastResponse = responseType;
+                lastError = error;
+            }
+        }
+
+        TestCallback callback = new TestCallback();
+
+        ResponseType responseType = ResponseType.NETWORK;
+        Error error = new Error();
+        callback.onRequestFail(responseType, error);
+
+        assertTrue(callback.finished);
+        assertEquals(responseType, callback.lastResponse);
+        assertEquals(error, callback.lastError);
+    }
+
+    @Test
+    public void testAlwaysCallable() {
+        class TestCallback extends EntryResultCallBack {
+            boolean alwaysCalled = false;
+
+            @Override
+            public void onCompletion(ResponseType responseType, Error error) {
+                // do nothing
+            }
+
+            @Override
+            void always() {
+                alwaysCalled = true;
+            }
+        }
+
+        TestCallback callback = new TestCallback();
+        callback.always();
+        assertTrue(callback.alwaysCalled);
+    }
+}