Add runIfMain method (denoland/deno_std#215)

Original: https://github.com/denoland/deno_std/commit/817a0fb439ff92cd67da8d4f1dae12a2a08121e1

1 files changed, 6 insertions, 0 deletions

diff --git a/testing/mod.ts b/testing/mod.ts
index e8e00ca74..45a38919a 100644
--- a/testing/mod.ts
+++ b/testing/mod.ts
@@ -290,3 +290,9 @@ export async function runTests() {
     }, 0);
   }
 }
+
+export async function runIfMain(meta: ImportMeta) {
+  if (window.location.toString() === meta.url) {
+    runTests();
+  }
+}