[WIP] Enable coverage for tests

config/babel.config.js

@@ -5,19 +5,28 @@
  */
 
 module.exports = api => {
+    const isProd = process.env.NODE_ENV === 'production';
+
+    const plugins = [
+        '@babel/plugin-proposal-class-properties',
+        '@babel/plugin-transform-destructuring',
+        '@babel/plugin-transform-modules-commonjs',
+        '@babel/plugin-transform-parameters',
+        '@babel/plugin-transform-spread',
+        '@babel/plugin-proposal-object-rest-spread',
+        '@babel/plugin-proposal-optional-chaining',
+        '@babel/plugin-proposal-nullish-coalescing-operator',
+        '@babel/plugin-transform-classes',
+    ];
+
+    if (!isProd) {
+        // plugins.push('istanbul');
+    }
+
     api.cache(true);
+
     return {
         presets: ['@babel/preset-react', '@babel/preset-typescript'],
-        plugins: [
-            '@babel/plugin-proposal-class-properties',
-            '@babel/plugin-transform-destructuring',
-            '@babel/plugin-transform-modules-commonjs',
-            '@babel/plugin-transform-parameters',
-            '@babel/plugin-transform-spread',
-            '@babel/plugin-proposal-object-rest-spread',
-            '@babel/plugin-proposal-optional-chaining',
-            '@babel/plugin-proposal-nullish-coalescing-operator',
-            '@babel/plugin-transform-classes',
-        ],
+        plugins,
     };
 };

config/eslintrc.js

@@ -6,6 +6,7 @@
 
 const fs = require('fs');
 
+// TODO: go through directories recursively and look for gitignore inside
 const entriesInGitignore = fs
     .readFileSync('.gitignore', 'utf8')
     .split('\n')

config/jest.config.js

@@ -29,6 +29,8 @@ module.exports = (disabledMocks = []) => ({
         ...(disabledMocks.includes('serialport')
             ? {}
             : { serialport: `${mockDir}/emptyMock.ts` }),
+        // Force module uuid to resolve with the CJS entry point, because Jest does not support package.json.exports. See https://github.com/uuidjs/uuid/issues/451
+        uuid: require.resolve('uuid'),
     },
     transform: {
         '^.+\\.[jt]sx?$': [
@@ -41,4 +43,8 @@ module.exports = (disabledMocks = []) => ({
     transformIgnorePatterns: ['node_modules/(?!(pc-nrfconnect-shared)/)'],
     setupFilesAfterEnv: [`${__dirname}/../test/setupTests.ts`],
     snapshotSerializers: ['enzyme-to-json/serializer'],
+
+    coverageDirectory: 'coverage/jest-coverage',
+    collectCoverage: true,
+    coverageReporters: ['json', 'text'],
 });

config/nyc.config.js

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2022 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-4-Clause
+ */
+
+module.exports = {
+    all: true,
+    'check-coverage': true,
+    'temp-dir': 'coverage/playwright/.nyc_output',
+    'report-dir': 'coverage/playwright-coverage',
+    reporter: 'json',
+    // must be overwritten by projects that do not  have src dir
+    include: '/src',
+    exclude: ['test-e2e'],
+    branches: 30,
+    lines: 30,
+    functions: 20,
+    statements: 30,
+};

index.d.ts

@@ -641,6 +641,9 @@ interface Window {
     appDir: string;
     appDataDir: string;
     appLogDir: string;
+
+    collectIstanbulCoverage?: (str: string) => void;
+    __coverage__?: string;
 }
 
 // Let typescript compiler in `npm run lint` resolve css modules