Update TsoStartTest to check for JSON error messages

Signed-off-by: Frank Giordano <giofr01@yahoo.com>

Author: frankgiordano

src/test/java/zowe/client/sdk/zostso/methods/TsoStartTest.java

@@ -96,9 +96,16 @@ public void tstTsoStartInvalidJsonThrowsZosmfRequestExceptionWithCorrectMessageF
             mocked.when(() -> TsoUtils.getResponseStr(any()))
                     .thenReturn("invalid json response");
 
-            ZosmfRequestException ex = assertThrows(ZosmfRequestException.class,
-                    () -> tsoStart.start(input));
-            assertTrue(ex.getMessage().contains("invalid json response"));
+            ZosmfRequestException ex = assertThrows(
+                    ZosmfRequestException.class,
+                    () -> tsoStart.start(input)
+            );
+
+            assertNotNull(ex.getMessage());
+            assertTrue(
+                    ex.getMessage().contains("Unrecognized token")
+                            || ex.getMessage().toLowerCase().contains("json")
+            );
         }
     }