chore: use web test runner

.circleci/config.yml

@@ -7,7 +7,7 @@ version: 2
 defaults: &defaults
   working_directory: ~/repo
   docker:
-    - image: circleci/node:10.16.0-browsers
+    - image: circleci/node:10.18.1-browsers
 
 jobs:
   test:

karma.bs.config.js

@@ -1,25 +0,0 @@
-/* eslint-disable import/no-extraneous-dependencies */
-const merge = require('webpack-merge');
-const bsSettings = require('@open-wc/testing-karma-bs/bs-settings.js');
-const createBaseConfig = require('./karma.conf.js');
-
-module.exports = config => {
-  config.set(
-    merge.strategy({
-      browsers: 'replace',
-    })(bsSettings(config), createBaseConfig(config), {
-      browserStack: {
-        project: 'lion',
-      },
-      browsers: [
-        'bs_win10_chrome_latest',
-        // Only chrome for now
-        // 'bs_win10_firefox_latest',
-        // 'bs_win10_edge_latest',
-        // 'bs_osxmojave_safari_latest',
-        // 'bs_win10_ie_11',
-      ],
-    }),
-  );
-  return config;
-};

karma.conf.js

@@ -1,38 +0,0 @@
-/* eslint-disable import/no-extraneous-dependencies */
-const { createDefaultConfig } = require('@open-wc/testing-karma');
-const merge = require('webpack-merge');
-
-module.exports = config => {
-  config.set(
-    merge(createDefaultConfig(config), {
-      files: [
-        // runs all files ending with .test in the test folder,
-        // can be overwritten by passing a --grep flag. examples:
-        //
-        // npm run test -- --grep test/foo/bar.test.js
-        // npm run test -- --grep test/bar/*
-        {
-          pattern: config.grep ? config.grep : 'packages/**/*/test/**/*.test.js',
-          type: 'module',
-        },
-      ],
-
-      esm: {
-        nodeResolve: true,
-      },
-
-      // TODO: improve coverage
-      coverageIstanbulReporter: {
-        thresholds: {
-          global: {
-            statements: 80,
-            branches: 70,
-            functions: 70,
-            lines: 80,
-          },
-        },
-      },
-    }),
-  );
-  return config;
-};

package.json

@@ -22,12 +22,9 @@
     "storybook:build": "build-storybook",
     "storybook:build:start": "es-dev-server --root-dir storybook-static --open",
     "test": "run-p test:browser test:node",
-    "test:browser": "karma start --coverage",
-    "test:browser:watch": "karma start --auto-watch=true --single-run=false",
-    "test:bs": "karma start karma.bs.config.js --coverage",
-    "test:node": "lerna run test:node",
-    "test:prune-snapshots": "karma start --prune-snapshots",
-    "test:update-snapshots": "karma start --update-snapshots"
+    "test:browser": "wtr packages/**/*/test/**/*.test.js --coverage",
+    "test:browser:watch": "wtr packages/**/*/test/**/*.test.js --watch",
+    "test:node": "lerna run test:node"
   },
   "devDependencies": {
     "@commitlint/cli": "^7.0.0",
@@ -38,10 +35,8 @@
     "@open-wc/eslint-config": "^1.0.0",
     "@open-wc/testing": "^2.5.0",
     "@open-wc/testing-helpers": "^1.0.0",
-    "@open-wc/testing-karma": "^3.2.30",
-    "@open-wc/testing-karma-bs": "^1.3.30",
-    "@open-wc/testing-wallaby": "^0.1.12",
     "@storybook/addon-a11y": "~5.0.0",
+    "@web/test-runner": "^0.2.9",
     "@webcomponents/webcomponentsjs": "^2.2.5",
     "babel-eslint": "^8.2.6",
     "babel-polyfill": "^6.26.0",

web-test-runner.config.mjs

@@ -0,0 +1,12 @@
+export default {
+  coverage: process.argv.includes('--coverage')
+    ? {
+        thresholds: {
+          statements: 80,
+          branches: 70,
+          functions: 70,
+          lines: 80,
+        },
+      }
+    : undefined,
+};