chore: added test to verify append chunk tx

Signed-off-by: Manish Dait <daitmanish88@gmail.com>

Author: manishdait

hiero-enterprise-microprofile/src/test/java/org/hiero/microprofile/test/FileClientTests.java

@@ -48,9 +48,12 @@ void testAppendFile() throws HieroException {
     final byte[] contents = "Hello,".getBytes();
     final FileId fileId = fileClient.createFile(contents);
 
+    Assertions.assertNotNull(fileId);
+
     fileClient.appendFile(fileId, " Hiero!");
     byte[] bytes = fileClient.readFile(fileId);
 
+    Assertions.assertNotNull(bytes);
     Assertions.assertEquals("Hello, Hiero!", new String(bytes));
   }
 
@@ -59,6 +62,21 @@ void testAppendFileThrowsExceptionWhenContentExceedMaxSize() throws HieroExcepti
     final byte[] content = new byte[FileCreateRequest.FILE_MAX_SIZE + 1];
     final FileId fileId = fileClient.createFile(new byte[0]);
 
+    Assertions.assertNotNull(fileId);
     Assertions.assertThrows(HieroException.class, () -> fileClient.appendFile(fileId, content));
   }
+
+  @Test
+  void testChunkedAppendFile() throws HieroException {
+    final String content = "A".repeat(FileCreateRequest.FILE_CREATE_MAX_SIZE * 2);
+    final FileId fileId = fileClient.createFile(new byte[0]);
+
+    Assertions.assertNotNull(fileId);
+
+    fileClient.appendFile(fileId, content);
+    byte[] bytes = fileClient.readFile(fileId);
+
+    Assertions.assertNotNull(bytes);
+    Assertions.assertEquals(content, new String(bytes));
+  }
 }

hiero-enterprise-spring/src/test/java/org/hiero/spring/test/FileClientTests.java

@@ -372,9 +372,12 @@ void testAppendFile() throws HieroException {
     final byte[] contents = "Hello,".getBytes();
     final FileId fileId = fileClient.createFile(contents);
 
+    Assertions.assertNotNull(fileId);
+
     fileClient.appendFile(fileId, " Hiero!");
     byte[] bytes = fileClient.readFile(fileId);
 
+    Assertions.assertNotNull(bytes);
     Assertions.assertEquals("Hello, Hiero!", new String(bytes));
   }
 
@@ -383,9 +386,25 @@ void testAppendFileThrowsExceptionWhenContentExceedMaxSize() throws HieroExcepti
     final byte[] content = new byte[FileCreateRequest.FILE_MAX_SIZE + 1];
     final FileId fileId = fileClient.createFile(new byte[0]);
 
+    Assertions.assertNotNull(fileId);
     Assertions.assertThrows(HieroException.class, () -> fileClient.appendFile(fileId, content));
   }
 
+  @Test
+  void testChunkedAppendFile() throws HieroException {
+    // 2048 * 2 = 2 chunk
+    final String content = "A".repeat(FileCreateRequest.FILE_CREATE_MAX_SIZE * 2);
+    final FileId fileId = fileClient.createFile(new byte[0]);
+
+    Assertions.assertNotNull(fileId);
+
+    fileClient.appendFile(fileId, content);
+    byte[] bytes = fileClient.readFile(fileId);
+
+    Assertions.assertNotNull(bytes);
+    Assertions.assertEquals(content, new String(bytes));
+  }
+
   @Test
   void testGetFileSize() throws HieroException {
     final byte[] contents = "Hello, Hiero!".getBytes();