testing: Don't automatically run on import (denoland/deno_std#129)

Original: ec1675a8ca

test.ts

@@ -23,3 +23,5 @@ import "testing/test.ts";
 import "textproto/test.ts";
 import "ws/sha1_test.ts";
 import "ws/test.ts";
+
+import "testing/main.ts";

testing/main.ts

@@ -0,0 +1,3 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { runTests } from "mod.ts";
+runTests();

testing/mod.ts

@@ -238,7 +238,7 @@ function green_ok() {
   return FG_GREEN + "ok" + RESET;
 }
 
-async function runTests() {
+export async function runTests() {
   let passed = 0;
   let failed = 0;
 
@@ -283,5 +283,3 @@ async function runTests() {
     }, 0);
   }
 }
-
-setTimeout(runTests, 0);