switch to using ava

package.json

@@ -5,10 +5,17 @@
   "description": "CodeQL action",
   "scripts": {
     "build": "tsc",
-    "test": "jest",
+    "test": "ava src/**",
     "lint": "tslint -p . -c tslint.json 'src/**/*.ts'",
     "removeNPMAbsolutePaths": "removeNPMAbsolutePaths . --force"
   },
+  "ava": {
+    "typescript": {
+      "rewritePaths": {
+        "src/": "lib/"
+      }
+    }
+  },
   "license": "MIT",
   "dependencies": {
     "@actions/core": "^1.0.0",

src/analysis-paths.test.ts

@@ -1,18 +1,20 @@
+import test from 'ava';
+
 import * as analysisPaths from './analysis-paths';
 import * as configUtils from './config-utils';
 
-test("emptyPaths", async () => {
+test("emptyPaths", async t => {
     let config = new configUtils.Config();
     analysisPaths.includeAndExcludeAnalysisPaths(config, []);
-    expect(process.env['LGTM_INDEX_INCLUDE']).toBeUndefined();
-    expect(process.env['LGTM_INDEX_EXCLUDE']).toBeUndefined();
+    t.is(process.env['LGTM_INDEX_INCLUDE'], undefined);
+    t.is(process.env['LGTM_INDEX_EXCLUDE'], undefined);
 });
 
-test("nonEmptyPaths", async () => {
+test("nonEmptyPaths", async t => {
     let config = new configUtils.Config();
     config.paths.push('path1', 'path2');
     config.pathsIgnore.push('path3', 'path4');
     analysisPaths.includeAndExcludeAnalysisPaths(config, []);
-    expect(process.env['LGTM_INDEX_INCLUDE']).toEqual('path1\npath2');
-    expect(process.env['LGTM_INDEX_EXCLUDE']).toEqual('path3\npath4');
-});
+    t.is(process.env['LGTM_INDEX_INCLUDE'], 'path1\npath2');
+    t.is(process.env['LGTM_INDEX_EXCLUDE'], 'path3\npath4');
+});

src/external-queries.test.ts

@@ -1,11 +1,12 @@
+import test from 'ava';
 import * as fs from "fs";
 import * as path from "path";
 
 import * as configUtils from "./config-utils";
 import * as externalQueries from "./external-queries";
 import * as util from "./util";
 
-test("checkoutExternalQueries", async () => {
+test("checkoutExternalQueries", async t => {
     let config = new configUtils.Config();
     config.externalQueries = [
         new configUtils.ExternalQuery("github/codeql-go", "df4c6869212341b601005567381944ed90906b6b"),
@@ -16,6 +17,6 @@ test("checkoutExternalQueries", async () => {
         await externalQueries.checkoutExternalQueries(config);
 
         // COPYRIGHT file existed in df4c6869212341b601005567381944ed90906b6b but not in master
-        expect(fs.existsSync(path.join(tmpDir, "github", "codeql-go", "COPYRIGHT"))).toBeTruthy();
+        t.true(fs.existsSync(path.join(tmpDir, "github", "codeql-go", "COPYRIGHT")));
     });
 });