test: yield to warnings printer

Author: legendecas

test/fixtures/stacktrace.ts

@@ -1,4 +1,8 @@
 enum Foo {
 	A = "Hello, TypeScript!",
 }
-throw new Error(Foo.A);
+
+// Allow warnings about source maps to be shown for testing purposes.
+setImmediate(() => {
+  throw new Error(Foo.A);
+});

test/loader.test.js

@@ -47,7 +47,7 @@ test("should warn and inaccurate stracktrace", async () => {
 
 	strictEqual(result.stdout, "");
 	match(result.stderr, /Source maps are disabled/);
-	match(result.stderr, /stacktrace.ts:5:7/); // inaccurate
+	match(result.stderr, /stacktrace.ts:7:11/); // inaccurate
 	strictEqual(result.code, 1);
 });
 
@@ -60,7 +60,7 @@ test("should not warn and accurate stracktrace", async () => {
 
 	doesNotMatch(result.stderr, /Source maps are disabled/);
 	strictEqual(result.stdout, "");
-	match(result.stderr, /stacktrace.ts:4:7/); // accurate
+	match(result.stderr, /stacktrace.ts:7:9/); // accurate
 	strictEqual(result.code, 1);
 });