[test] Remove decode_output argument to shared.run_process. NFC

Author: sbc100

scripts/test/shared.py

@@ -302,15 +302,11 @@ def remove_readonly_and_try_again(func, path, exc_info):
         pass
 
 
-def run_process(cmd, check=True, input=None, decode_output=True, *args, **kw):
-    if input and type(input) is str:
-        input = bytes(input, 'utf-8')
-    ret = subprocess.run(cmd, check=check, input=input, *args, **kw)
-    if decode_output and ret.stdout is not None:
-        ret.stdout = ret.stdout.decode('utf-8')
-    if ret.stderr is not None:
-        ret.stderr = ret.stderr.decode('utf-8')
-    return ret
+def run_process(cmd, check=True, text=True, *args, **kw):
+    """Trivial wrapper around subprocess.run that defaults to check=True and
+    text=True
+    """
+    return subprocess.run(cmd, check=check, text=text, *args, **kw)
 
 
 def fail_with_error(msg):

test/unit/test_features.py

@@ -422,8 +422,8 @@ def test_explicit_detect_features(self):
     def test_emit_all_features(self):
         p = shared.run_process(shared.WASM_OPT +
                                ['--emit-target-features', '-all', '-o', '-'],
-                               input="(module)", check=False,
-                               capture_output=True, decode_output=False)
+                               input=b"(module)", check=False, text=False,
+                               capture_output=True)
         self.assertEqual(p.returncode, 0)
         p2 = shared.run_process(shared.WASM_OPT +
                                 ['--print-features', '-o', os.devnull],