Simplify Bazel (#312)

test/BUILD.bazel

@@ -1,5 +1,20 @@
-load("@rules_cc//cc:defs.bzl", "cc_test")
-load("@magic_enum//bazel:copts.bzl", "COPTS")
+_TESTS = [
+    "test",
+    "test_flags",
+]
+
+_MSVC_FLAGS = ["/std:c++17", "/permissive-"]
+_COPTS = select({
+    "//conditions:default": ["-std=c++17"],
+    "@rules_cc//cc/compiler:msvc-cl": _MSVC_FLAGS,
+    "@rules_cc//cc/compiler:clang-cl": _MSVC_FLAGS, 
+})
+[cc_test(
+    name = test,
+    srcs = ["{}.cpp".format(test)],
+    deps = ["@magic_enum", ":catch2"],
+    copts = _COPTS,
+) for test in _TESTS]
 
 # bazel central registry has a catch2 module, but is newer than the one included
 # in this repository
@@ -7,17 +22,4 @@ cc_library(
     name = "catch2",
     includes = ["3rdparty/Catch2/include"],
     hdrs = ["3rdparty/Catch2/include/catch2/catch.hpp"],
-    copts = COPTS,
 )
-
-_TESTS = [
-    "test",
-    "test_flags",
-]
-
-[cc_test(
-    name = test,
-    srcs = ["{}.cpp".format(test)],
-    deps = ["@magic_enum", ":catch2"],
-    copts = COPTS,
-) for test in _TESTS]

test/MODULE.bazel

@@ -1,6 +1,6 @@
 module(name = "magic_enum_tests")
 
 bazel_dep(name = "magic_enum")
-bazel_dep(name = "rules_cc", version = "0.0.8")
-
 local_path_override(module_name = "magic_enum", path = "..")
+
+bazel_dep(name = "rules_cc", version = "0.0.8")