Set up backend tests setup

Author: Austin-X

course-matrix/backend/jest.config.ts

@@ -0,0 +1,25 @@
+import type { Config } from "jest";
+
+const config: Config = {
+  preset: "ts-jest",
+  moduleNameMapper: {
+    "\\.(css|scss)$": "identity-obj-proxy",
+    "^.+\\.svg": "<rootDir>/tests/mocks/svgMock.tsx",
+  },
+  // to obtain access to the matchers.
+  setupFilesAfterEnv: ["<rootDir>/tests/setupTests.ts"],
+  moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"],
+  modulePaths: ["<rootDir>"],
+  testEnvironment: "jsdom",
+  transform: {
+    "^.+\\.(ts|tsx)$": [
+      "ts-jest",
+      {
+        tsconfig: "tsconfig.test.json",
+      },
+    ],
+    "^.+\\.(js|jsx)$": "babel-jest",
+  },
+};
+
+export default config;