add jest setup, WIP porting tests

.gitignore

@@ -4,6 +4,9 @@
 # distribution folder
 /dist
 
+# coverage
+/coverage
+
 .DS_Store
 
 npm-debug.log*

demo/.env

@@ -0,0 +1,5 @@
+# This is used to skip the error where
+# e.g. babel-jest is a sub-dependency in the parent dir
+# but is also used by react-scripts:
+# "There might be a problem with the project dependency tree"
+SKIP_PREFLIGHT_CHECK=true

jest.config.json

@@ -0,0 +1,9 @@
+{
+  "rootDir": "src",
+  "transform": {
+    "^.+\\.(t|j)sx?$": "ts-jest"
+  },
+  "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
+  "moduleFileExtensions": ["ts", "tsx", "js", "jsx", "json", "node"],
+  "coverageDirectory": "<rootDir>/../coverage"
+}

package.json

@@ -24,12 +24,15 @@
     "clean": "rimraf dist",
     "format": "prettier --write 'src/**/*' 'demo/src/**/*'",
     "prepare": "npm run clean && npm run build",
-    "start": "tsc -w"
+    "start": "tsc -w",
+    "test": "jest --config jest.config.json --coverage"
   },
   "devDependencies": {
+    "@types/jest": "^24.0.11",
     "@types/react": "^16.8.14",
     "chai": "^3.5.0",
     "enzyme": "^2.3.0",
+    "jest": "^24.7.1",
     "jsdom": "^9.0.0",
     "mocha": "^3.3.0",
     "npm-run-all": "^4.1.5",
@@ -38,6 +41,7 @@
     "react-addons-test-utils": "^15.0.2",
     "react-dom": "^15.4.0",
     "rimraf": "^2.3.4",
+    "ts-jest": "^24.0.2",
     "typescript": "^3.4.4"
   },
   "dependencies": {

src/__tests__/CircularProgressbar.test.tsx

@@ -0,0 +1,5 @@
+describe('<CircularProgressbar />', () => {
+  test('something', () => {
+    expect(true).toBe(true);
+  });
+});