tests/run-tests: Allow to skip set tests.

If sets are not enabled, set literals lead to SyntaxError during parsing,
so it requires feature_check. Set tests are skipped based on set_*.py
pattern.

tests/feature_check/set_check.py

@@ -0,0 +1,2 @@
+# check if set literal syntax is supported
+{1}

tests/run-tests

@@ -195,12 +195,18 @@ def run_tests(pyb, tests, args):
 
     skip_tests = set()
     skip_native = False
+    skip_set_type = False
 
     # Check if micropython.native is supported, and skip such tests if it's not
     native = run_micropython(pyb, args, 'feature_check/native_check.py')
     if native == b'CRASH':
         skip_native = True
 
+    # Check if set type (and set literals) is supported, and skip such tests if it's not
+    native = run_micropython(pyb, args, 'feature_check/set_check.py')
+    if native == b'CRASH':
+        skip_set_type = True
+
     # Check if emacs repl is supported, and skip such tests if it's not
     t = run_micropython(pyb, args, 'feature_check/repl_emacs_check.py')
     if not 'True' in str(t, 'ascii'):
@@ -304,8 +310,14 @@ def run_tests(pyb, tests, args):
         test_name = os.path.splitext(test_basename)[0]
         is_native = test_name.startswith("native_") or test_name.startswith("viper_")
         is_endian = test_name.endswith("_endian")
+        is_set_type = test_name.startswith("set_")
+
+        skip_it = test_file in skip_tests
+        skip_it |= skip_native and is_native
+        skip_it |= skip_endian and is_endian
+        skip_it |= skip_set_type and is_set_type
 
-        if test_file in skip_tests or (skip_native and is_native) or (skip_endian and is_endian):
+        if skip_it:
             print("skip ", test_file)
             skipped_tests.append(test_name)
             continue