Merge pull request #2 from epeters-jrmngndr/npm-test

Add React Unit Tests

frontend/babel.config.cjs

@@ -0,0 +1,18 @@
+module.exports = {
+  presets: [
+    [
+      '@babel/preset-env',
+      {
+        targets: {
+          node: 'current',
+        },
+      },
+    ],
+    '@babel/preset-react',
+  ],
+  plugins: [
+    '@babel/plugin-transform-class-properties',
+    '@babel/plugin-transform-runtime',
+    '@babel/plugin-transform-modules-commonjs'
+  ],
+};

frontend/jest.config.cjs

@@ -0,0 +1,13 @@
+// jest.config.js
+module.exports = {
+  moduleNameMapper: {
+    "\\.(css|less|scss|sass)$": "identity-obj-proxy",
+  },
+  clearMocks: true,
+  coverageDirectory: "coverage",
+  testEnvironment: "jsdom",
+  transform: {
+    '^.+\\.jsx?$': 'babel-jest',
+  },
+  setupFilesAfterEnv: ['./jest.setup.cjs'],
+};

frontend/jest.setup.cjs

@@ -0,0 +1,13 @@
+// Jest isn't compatible with more recent versions of react-markdown, and so this warning arises about future incompatibility. Suppress it, for now.
+beforeAll(() => {
+  jest.spyOn(console, 'error').mockImplementation((msg) => {
+    if (msg.includes('Support for defaultProps will be removed from function components')) {
+      return;
+    }
+    console.error(msg);
+  });
+});
+
+afterAll(() => {
+  console.error.mockRestore();
+});