Fix typo in comment (microsoft#1711)

PeterJCLaw · brettcannon · commit 9022527acd98 · 2018-05-22T16:27:19.000-07:00
diff --git a/src/test/testRunner.ts b/src/test/testRunner.ts
@@ -38,7 +38,7 @@ type Instrumenter = istanbul.Instrumenter & { coverState: CoverState };
 type TestCallback = (error?: Error, failures?: number) => void;
 
 // Linux: prevent a weird NPE when mocha on Linux requires the window size from the TTY.
-// Since we are not running in a tty environment, we just implementt he method statically.
+// Since we are not running in a tty environment, we just implement the method statically.
 const tty = require('tty');
 if (!tty.getWindowSize) {
     tty.getWindowSize = function (): number[] { return [80, 75]; };
