unittest: Allow SkipTest to work within a subTest.

Signed-off-by: Damien George <damien@micropython.org>

python-stdlib/unittest/tests/test_subtest.py

@@ -0,0 +1,14 @@
+import unittest
+
+
+class Test(unittest.TestCase):
+    def test_subtest_skip(self):
+        for i in range(4):
+            with self.subTest(i=i):
+                print("sub test", i)
+                if i == 2:
+                    self.skipTest("skip 2")
+
+
+if __name__ == "__main__":
+    unittest.main()

python-stdlib/unittest/unittest/__init__.py

@@ -348,7 +348,13 @@ def _handle_test_exception(
     exc = exc_info[1]
     traceback = exc_info[2]
     ex_str = _capture_exc(exc, traceback)
-    if isinstance(exc, AssertionError):
+    if isinstance(exc, SkipTest):
+        reason = exc.args[0]
+        test_result.skippedNum += 1
+        test_result.skipped.append((current_test, reason))
+        print(" skipped:", reason)
+        return
+    elif isinstance(exc, AssertionError):
         test_result.failuresNum += 1
         test_result.failures.append((current_test, ex_str))
         if verbose:
@@ -396,11 +402,6 @@ def _run_suite(c, test_result: TestResult, suite_name=""):
                 print(" FAIL")
             else:
                 print(" ok")
-        except SkipTest as e:
-            reason = e.args[0]
-            print(" skipped:", reason)
-            test_result.skippedNum += 1
-            test_result.skipped.append((name, c, reason))
         except Exception as ex:
             _handle_test_exception(
                 current_test=(name, c), test_result=test_result, exc_info=(type(ex), ex, None)