[turbolizer] Add test suite

Bug: v8:7327
Change-Id: Icb9df07963b2fd6686946713d802e12e1d595e95
Reviewed-on: https://chromium-review.googlesource.com/c/1274087Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56566}

tools/turbolizer/package.json

@@ -6,7 +6,8 @@
     "build": "rollup -c",
     "watch": "tsc --watch",
     "deploy": "./deploy.sh",
-    "format": "tsfmt -r"
+    "format": "tsfmt -r",
+    "test": "ts-mocha -p tsconfig.test.json test/**/*-test.ts"
   },
   "author": "The V8 team",
   "license": "MIT",
@@ -23,6 +24,9 @@
     "url": "https://github.com/v8/v8.git"
   },
   "devDependencies": {
+    "chai": "^4.2.0",
+    "mocha": "^5.2.0",
+    "ts-mocha": "^2.0.0",
     "typescript": "^2.9.1",
     "typescript-formatter": "^7.2.2"
   }

tools/turbolizer/test/source-resolver-test.ts

+import {SourceResolver} from '../src/source-resolver';
+import {expect} from 'chai';
+import {describe, it} from 'mocha';
+
+describe('SourceResolver', () => {
+  it('should be constructible', () => {
+    let a:SourceResolver = new SourceResolver();
+    expect(a.sources.length).to.equal(0);
+  });
+});

tools/turbolizer/tsconfig.test.json

+{
+    "extends": "./tsconfig.json",
+    "compilerOptions": {
+        "module": "commonjs"
+    }
+}