added unit test with different date format

Author: sureshanaparti

core/src/test/java/com/cloud/serializer/GsonHelperTest.java

@@ -21,6 +21,7 @@
 import com.cloud.storage.DataStoreRole;
 import com.cloud.utils.DateUtil;
 import com.google.gson.Gson;
+import com.google.gson.JsonSyntaxException;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -96,7 +97,7 @@ public void testGsonDateFormatSerialization() {
     }
 
     @Test
-    public void testGsonDateFormatDeserialization() throws Exception {
+    public void testGsonDateFormatDeserializationWithSameDateFormat() throws Exception {
         String json = "{\"str\":\"TestString\",\"num\":999,\"date\":\"2025-08-22T15:39:43+0000\"}";
         TestClass testObj = gson.fromJson(json, TestClass.class);
 
@@ -106,6 +107,63 @@ public void testGsonDateFormatDeserialization() throws Exception {
         assertEquals(expectedDate, testObj.getDate());
     }
 
+    @Test (expected = JsonSyntaxException.class)
+    public void testGsonDateFormatDeserializationWithDifferentDateFormat() throws Exception {
+        String json = "{\"str\":\"TestString\",\"num\":999,\"date\":\"22/08/2025T15:39:43+0000\"}";
+        gson.fromJson(json, TestClass.class);
+        /* Deserialization throws the below exception:
+        com.google.gson.JsonSyntaxException: 22/08/2025T15:39:43+0000
+
+            at com.google.gson.DefaultTypeAdapters$DefaultDateTypeAdapter.deserializeToDate(DefaultTypeAdapters.java:376)
+            at com.google.gson.DefaultTypeAdapters$DefaultDateTypeAdapter.deserialize(DefaultTypeAdapters.java:351)
+            at com.google.gson.DefaultTypeAdapters$DefaultDateTypeAdapter.deserialize(DefaultTypeAdapters.java:307)
+            at com.google.gson.JsonDeserializationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:92)
+            at com.google.gson.JsonObjectDeserializationVisitor.visitFieldUsingCustomHandler(JsonObjectDeserializationVisitor.java:117)
+            at com.google.gson.ReflectingFieldNavigator.visitFieldsReflectively(ReflectingFieldNavigator.java:63)
+            at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:120)
+            at com.google.gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationContextDefault.java:76)
+            at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:54)
+            at com.google.gson.Gson.fromJson(Gson.java:551)
+            at com.google.gson.Gson.fromJson(Gson.java:498)
+            at com.google.gson.Gson.fromJson(Gson.java:467)
+            at com.google.gson.Gson.fromJson(Gson.java:417)
+            at com.google.gson.Gson.fromJson(Gson.java:389)
+            at com.cloud.serializer.GsonHelperTest.testGsonDateFormatDeserializationWithDifferentDateFormat(GsonHelperTest.java:113)
+            at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
+            at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
+            at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
+            at java.base/java.lang.reflect.Method.invoke(Method.java:566)
+            at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
+            at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
+            at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
+            at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
+            at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
+            at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
+            at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
+            at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
+            at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
+            at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
+            at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
+            at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
+            at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
+            at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
+            at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
+            at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
+            at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
+            at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
+            at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
+            at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
+            at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
+            at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
+            at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:231)
+            at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:55)
+        Caused by: java.text.ParseException: Unparseable date: "22/08/2025T15:39:43+0000"
+            at java.base/java.text.DateFormat.parse(DateFormat.java:395)
+            at com.google.gson.DefaultTypeAdapters$DefaultDateTypeAdapter.deserializeToDate(DefaultTypeAdapters.java:374)
+            ... 42 more
+         */
+    }
+
     private static class TestClass {
         private String str;
         private int num;