test: Tweak style in checker

test_checker.py

@@ -18,7 +18,7 @@ def run_checker(task_file: FilePath, solution_file: FilePath, html: bool) \
         task = task_handle.read()
 
     args = [sys.executable,  # the Python itself
-                           "fja_checker/__main__.py"]
+            "fja_checker/__main__.py"]
     if html:
         args.append("--html")
     return subprocess.run(args + [solution_file, f"-o{task}"],
@@ -37,7 +37,7 @@ def run_tests(test_dir: FilePath, html: bool) -> None:
     files = filter(lambda x: os.path.isfile(x),
                    map(lambda x: os.path.join(test_dir, x),
                        os.listdir(test_dir)))
-    tests: Dict[FilePath, Set[FilePath]] = dict()
+    tests: Dict[FilePath, Set[FilePath]] = {}
     for basename, suff in map(lambda x: x.split('.', 1), files):
         if suff.endswith("ok") or suff.endswith("nok"):
             tests.setdefault(f"{basename}.q", set()).add(f"{basename}.{suff}")
@@ -65,17 +65,17 @@ def run_tests(test_dir: FilePath, html: bool) -> None:
 
 # Test entry points
 
-def test_reg_text():
+def test_reg_text() -> None:
     run_tests("test/checker/reg", False)
 
 
-def test_reg_html():
+def test_reg_html() -> None:
     run_tests("test/checker/reg", True)
 
 
-def test_cfl_text():
+def test_cfl_text() -> None:
     run_tests("test/checker/cfl", False)
 
 
-def test_cfl_html():
+def test_cfl_html() -> None:
     run_tests("test/checker/cfl", True)