dtoc: Update fdt tests to use test_util

Use the common functions to run tests and report results. Ensure that the
result code indicates success or failure.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

tools/dtoc/test_fdt.py

@@ -780,25 +780,17 @@ def RunTests(args):
     Args:
         args: List of positional args provided to fdt. This can hold a test
             name to execute (as in 'fdt -t testFdt', for example)
+
+    Returns:
+        Return code, 0 on success
     """
     result = unittest.TestResult()
-    sys.argv = [sys.argv[0]]
     test_name = args and args[0] or None
-    for module in (TestFdt, TestNode, TestProp, TestFdtUtil):
-        if test_name:
-            try:
-                suite = unittest.TestLoader().loadTestsFromName(test_name, module)
-            except AttributeError:
-                continue
-        else:
-            suite = unittest.TestLoader().loadTestsFromTestCase(module)
-        suite.run(result)
+    test_util.run_test_suites(
+        result, False, False, False, None, test_name, None,
+        [TestFdt, TestNode, TestProp, TestFdtUtil])
 
-    print(result)
-    for _, err in result.errors:
-        print(err)
-    for _, err in result.failures:
-        print(err)
+    return test_util.report_result('fdt', test_name, result)
 
 if __name__ != '__main__':
     sys.exit(1)
@@ -816,6 +808,7 @@ parser.add_option('-T', '--test-coverage', action='store_true',
 
 # Run our meagre tests
 if options.test:
-    RunTests(args)
+    ret_code = RunTests(args)
+    sys.exit(ret_code)
 elif options.test_coverage:
     RunTestCoverage()