add: tests

jest.config.js

@@ -0,0 +1,15 @@
+module.exports = {
+    testEnvironment: "jsdom",
+    setupFilesAfterEnv: ["@testing-library/jest-dom", "<rootDir>/jest.setup.js"],
+    moduleNameMapper: {
+        "\\.(css|less|scss|sass)$": "identity-obj-proxy",
+    },
+    transform: {
+        "^.+\\.[t|j]sx?$": "babel-jest",
+    },
+    transformIgnorePatterns: [
+        'node_modules/(?!(@thi.ng)/)',
+        "node_modules/(?!node-fetch|katex|react-markdown|remark-math|rehype-katex|rehype-raw)"
+    ],
+
+};