From fba491f2c4e878cc9c7ae9788d9316cb21e30e01 Mon Sep 17 00:00:00 2001
From: Armand Philippot <git@armandphilippot.com>
Date: Thu, 24 Mar 2022 15:53:30 +0100
Subject: build: configure jest

Since Next.js v12, Jest is already configured with the
next/jest package.
I also added a package to mock next/router.
---
 jest.config.js | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 jest.config.js

(limited to 'jest.config.js')

diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..8f397f6
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,44 @@
+const nextJest = require('next/jest');
+
+const createJestConfig = nextJest({
+  // Provide the path to your Next.js app to load next.config.js and .env files in your test environment
+  dir: './',
+});
+
+/*
+ * Add any custom config to be passed to Jest
+ *
+ * For a detailed explanation regarding each configuration property and type
+ * check, visit:
+ * https://jestjs.io/docs/configuration
+ */
+const customJestConfig = {
+  // if using TypeScript with a baseUrl set to the root directory then you need the below for alias' to work
+  moduleDirectories: ['node_modules', '<rootDir>/'],
+
+  // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
+  moduleNameMapper: {
+    /** Module Path Aliases */
+    '^@i18n/(.*)$': '<rootDir>/src/i18n/$1',
+    '^@assets/(.*)$': '<rootDir>/src/assets/$1',
+    '^@content/(.*)$': '<rootDir>/src/content/$1',
+    '^@components/(.*)$': '<rootDir>/src/components/$1',
+    '^@pages/(.*)$': '<rootDir>/src/pages/$1',
+    '^@services/(.*)$': '<rootDir>/src/services/$1',
+    '^@styles/(.*)$': '<rootDir>/src/styles/$1',
+    '^@ts/(.*)$': '<rootDir>/src/ts/$1',
+    '^@utils/(.*)$': '<rootDir>/src/utils/$1',
+  },
+
+  // Add more setup options before each test is run
+  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
+
+  // The test environment that will be used for testing
+  testEnvironment: 'jest-environment-jsdom',
+};
+
+/**
+ * createJestConfig is exported this way to ensure that next/jest can load the
+ * Next.js config which is async.
+ */
+module.exports = createJestConfig(customJestConfig);
-- 
cgit v1.2.3


From 641cfdb0b28ffa0e6cd5d2342bc218613ce4d051 Mon Sep 17 00:00:00 2001
From: Armand Philippot <git@armandphilippot.com>
Date: Thu, 24 Mar 2022 19:14:15 +0100
Subject: test(jest): define a custom render function to set providers

---
 __tests__/utils/test-utils.tsx | 44 ++++++++++++++++++++++++++++++++++++++++++
 jest.config.js                 |  6 ++++++
 tsconfig.json                  |  5 +++--
 3 files changed, 53 insertions(+), 2 deletions(-)
 create mode 100644 __tests__/utils/test-utils.tsx

(limited to 'jest.config.js')

diff --git a/__tests__/utils/test-utils.tsx b/__tests__/utils/test-utils.tsx
new file mode 100644
index 0000000..4befd47
--- /dev/null
+++ b/__tests__/utils/test-utils.tsx
@@ -0,0 +1,44 @@
+import { render, RenderOptions } from '@testing-library/react';
+import { ThemeProvider } from 'next-themes';
+import { FC } from 'react';
+import { IntlProvider } from 'react-intl';
+
+type ProvidersConfig = {
+  locale?: 'en' | 'fr';
+};
+
+type CustomRenderOptions = {
+  providers: ProvidersConfig;
+  testingLibrary: Omit<RenderOptions, 'wrapper'>;
+};
+
+/**
+ * Return a component wrapped with Intl and Theme Provider.
+ *
+ * @returns A component wrapped Intl and Theme providers.
+ */
+const AllTheProviders: FC<ProvidersConfig> = ({ children, locale = 'en' }) => {
+  return (
+    <IntlProvider locale={locale}>
+      <ThemeProvider>{children}</ThemeProvider>
+    </IntlProvider>
+  );
+};
+
+/**
+ * Render a component with all the providers.
+ *
+ * @param {JSX.Element} ui - A React component.
+ * @param {CustomRenderOptions} [options] - An object of render options and providers options.
+ * @returns A React component wrapped with all the providers.
+ */
+const customRender = (ui: JSX.Element, options?: CustomRenderOptions) => {
+  const Component = () => ui;
+  render(<Component />, {
+    wrapper: () => <AllTheProviders {...options?.providers} />,
+    ...options?.testingLibrary,
+  });
+};
+
+export * from '@testing-library/react';
+export { customRender as render };
diff --git a/jest.config.js b/jest.config.js
index 8f397f6..8ca07f3 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -26,6 +26,7 @@ const customJestConfig = {
     '^@pages/(.*)$': '<rootDir>/src/pages/$1',
     '^@services/(.*)$': '<rootDir>/src/services/$1',
     '^@styles/(.*)$': '<rootDir>/src/styles/$1',
+    '^@test-utils': '<rootDir>/__tests__/utils/test-utils',
     '^@ts/(.*)$': '<rootDir>/src/ts/$1',
     '^@utils/(.*)$': '<rootDir>/src/utils/$1',
   },
@@ -35,6 +36,11 @@ const customJestConfig = {
 
   // The test environment that will be used for testing
   testEnvironment: 'jest-environment-jsdom',
+
+  testPathIgnorePatterns: [
+    '<rootDir>/__tests__/jest/__mocks__',
+    '<rootDir>/__tests__/utils',
+  ],
 };
 
 /**
diff --git a/tsconfig.json b/tsconfig.json
index e110340..318ac6d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -23,8 +23,9 @@
       "@pages/*": ["src/pages/*"],
       "@services/*": ["src/services/*"],
       "@styles/*": ["src/styles/*"],
-      "@utils/*": ["src/utils/*"],
-      "@ts/*": ["src/ts/*"]
+      "@test-utils": ["__tests__/utils/test-utils"],
+      "@ts/*": ["src/ts/*"],
+      "@utils/*": ["src/utils/*"]
     }
   },
   "include": [
-- 
cgit v1.2.3