Fix tests run in parallel

RyanCavanaugh · RyanCavanaugh · commit d9bfbfe3bef1 · 2018-05-24T13:01:44.000-07:00
diff --git a/src/harness/unittests/tsbuild.ts b/src/harness/unittests/tsbuild.ts
@@ -21,6 +21,7 @@ namespace ts {
             const host = new fakes.CompilerHost(fs);
             const builder = createSolutionBuilder(host, reportDiagnostic, { dry: false, force: false, verbose: false });
 
+            clearDiagnostics();
             fs.chdir("/src/tests");
             builder.buildProjects(["."]);
             assertDiagnosticMessages(/*empty*/);
