test: Add tests

.babelrc.js

@@ -7,6 +7,6 @@ module.exports = {
   plugins: [
     ['@babel/proposal-object-rest-spread', { loose }],
     cjs && ['@babel/transform-modules-commonjs', { loose }],
-    ['@babel/transform-runtime', { useESModules: !cjs }],
-  ].filter(Boolean),
-}
+    ['@babel/transform-runtime', { useESModules: !cjs }]
+  ].filter(Boolean)
+}

.eslintrc

@@ -11,7 +11,8 @@
   },
   "env": {
     "browser": true,
-    "node": true
+    "node": true,
+    "jest": true
   },
   "globals": {
     "Promise": true
@@ -19,7 +20,5 @@
   "rules": {
     "valid-jsdoc": 2
   },
-  "plugins": [
-    "import"
-  ]
-}
+  "plugins": ["import"]
+}

.travis.yml

@@ -1,7 +1,9 @@
 language: node_js
 node_js: 11
 sudo: false
-script: npm run lint
+script:
+  - npm run lint
+  - npm test
 deploy:
   skip_cleanup: true
   provider: script

__mocks__/axios.js

@@ -0,0 +1,8 @@
+module.exports = mockAxios
+
+function mockAxios() {
+  return new Promise((resolve, reject) => {
+    mockAxios.resolvePromise = resolve
+    mockAxios.rejectPromise = reject
+  })
+}

jest.config.js

@@ -0,0 +1,185 @@
+// For a detailed explanation regarding each configuration property, visit:
+// https://jestjs.io/docs/en/configuration.html
+
+module.exports = {
+  // All imported modules in your tests should be mocked automatically
+  // automock: false,
+
+  // Stop running tests after `n` failures
+  // bail: 0,
+
+  // Respect "browser" field in package.json when resolving modules
+  // browser: false,
+
+  // The directory where Jest should store its cached dependency information
+  // cacheDirectory: "C:\\Users\\simone\\AppData\\Local\\Temp\\jest",
+
+  // Automatically clear mock calls and instances between every test
+  clearMocks: true,
+
+  // Indicates whether the coverage information should be collected while executing the test
+  // collectCoverage: false,
+
+  // An array of glob patterns indicating a set of files for which coverage information should be collected
+  // collectCoverageFrom: null,
+
+  // The directory where Jest should output its coverage files
+  coverageDirectory: 'coverage'
+
+  // An array of regexp pattern strings used to skip coverage collection
+  // coveragePathIgnorePatterns: [
+  //   "\\\\node_modules\\\\"
+  // ],
+
+  // A list of reporter names that Jest uses when writing coverage reports
+  // coverageReporters: [
+  //   "json",
+  //   "text",
+  //   "lcov",
+  //   "clover"
+  // ],
+
+  // An object that configures minimum threshold enforcement for coverage results
+  // coverageThreshold: null,
+
+  // A path to a custom dependency extractor
+  // dependencyExtractor: null,
+
+  // Make calling deprecated APIs throw helpful error messages
+  // errorOnDeprecated: false,
+
+  // Force coverage collection from ignored files using an array of glob patterns
+  // forceCoverageMatch: [],
+
+  // A path to a module which exports an async function that is triggered once before all test suites
+  // globalSetup: null,
+
+  // A path to a module which exports an async function that is triggered once after all test suites
+  // globalTeardown: null,
+
+  // A set of global variables that need to be available in all test environments
+  // globals: {},
+
+  // An array of directory names to be searched recursively up from the requiring module's location
+  // moduleDirectories: [
+  //   "node_modules"
+  // ],
+
+  // An array of file extensions your modules use
+  // moduleFileExtensions: [
+  //   "js",
+  //   "json",
+  //   "jsx",
+  //   "ts",
+  //   "tsx",
+  //   "node"
+  // ],
+
+  // A map from regular expressions to module names that allow to stub out resources with a single module
+  // moduleNameMapper: {},
+
+  // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
+  // modulePathIgnorePatterns: [],
+
+  // Activates notifications for test results
+  // notify: false,
+
+  // An enum that specifies notification mode. Requires { notify: true }
+  // notifyMode: "failure-change",
+
+  // A preset that is used as a base for Jest's configuration
+  // preset: null,
+
+  // Run tests from one or more projects
+  // projects: null,
+
+  // Use this configuration option to add custom reporters to Jest
+  // reporters: undefined,
+
+  // Automatically reset mock state between every test
+  // resetMocks: false,
+
+  // Reset the module registry before running each individual test
+  // resetModules: false,
+
+  // A path to a custom resolver
+  // resolver: null,
+
+  // Automatically restore mock state between every test
+  // restoreMocks: false,
+
+  // The root directory that Jest should scan for tests and modules within
+  // rootDir: null,
+
+  // A list of paths to directories that Jest should use to search for files in
+  // roots: [
+  //   "<rootDir>"
+  // ],
+
+  // Allows you to use a custom runner instead of Jest's default test runner
+  // runner: "jest-runner",
+
+  // The paths to modules that run some code to configure or set up the testing environment before each test
+  // setupFiles: [],
+
+  // A list of paths to modules that run some code to configure or set up the testing framework before each test
+  // setupFilesAfterEnv: [],
+
+  // A list of paths to snapshot serializer modules Jest should use for snapshot testing
+  // snapshotSerializers: [],
+
+  // The test environment that will be used for testing
+  // testEnvironment: "jest-environment-jsdom",
+
+  // Options that will be passed to the testEnvironment
+  // testEnvironmentOptions: {},
+
+  // Adds a location field to test results
+  // testLocationInResults: false,
+
+  // The glob patterns Jest uses to detect test files
+  // testMatch: [
+  //   "**/__tests__/**/*.[jt]s?(x)",
+  //   "**/?(*.)+(spec|test).[tj]s?(x)"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
+  // testPathIgnorePatterns: [
+  //   "\\\\node_modules\\\\"
+  // ],
+
+  // The regexp pattern or array of patterns that Jest uses to detect test files
+  // testRegex: [],
+
+  // This option allows the use of a custom results processor
+  // testResultsProcessor: null,
+
+  // This option allows use of a custom test runner
+  // testRunner: "jasmine2",
+
+  // This option sets the URL for the jsdom environment. It is reflected in properties such as location.href
+  // testURL: "http://localhost",
+
+  // Setting this value to "fake" allows the use of fake timers for functions such as "setTimeout"
+  // timers: "real",
+
+  // A map from regular expressions to paths to transformers
+  // transform: null,
+
+  // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
+  // transformIgnorePatterns: [
+  //   "\\\\node_modules\\\\"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them
+  // unmockedModulePathPatterns: undefined,
+
+  // Indicates whether each individual test should be reported during the run
+  // verbose: null,
+
+  // An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode
+  // watchPathIgnorePatterns: [],
+
+  // Whether to use watchman for file crawling
+  // watchman: true,
+}

package.json

@@ -20,18 +20,19 @@
     "src"
   ],
   "scripts": {
-    "build:commonjs": "cross-env BABEL_ENV=commonjs babel src --out-dir lib",
-    "build:es": "babel src --out-dir es",
+    "build:commonjs": "cross-env BABEL_ENV=commonjs babel src/index.js --out-dir lib",
+    "build:es": "babel src/index.js --out-dir es",
     "build": "run-p build:*",
     "clean": "rimraf lib es coverage",
     "format": "prettier --write \"src/**/*.{js,md}\"",
     "lint": "eslint src",
     "prepare": "npm run clean && npm run build",
     "prepublishOnly": "npm run build",
-    "release": "standard-version"
+    "release": "standard-version",
+    "test": "jest"
   },
   "dependencies": {
-    "@babel/runtime": "^7.3.1",
+    "@babel/runtime": "^7.4.5",
     "lru-cache": "^5.1.1"
   },
   "peerDependencies": {
@@ -39,24 +40,27 @@
     "axios": "^0.18.0"
   },
   "devDependencies": {
-    "@babel/cli": "^7.2.3",
-    "@babel/core": "^7.3.3",
-    "@babel/plugin-transform-runtime": "^7.2.0",
-    "@babel/preset-env": "^7.3.1",
+    "@babel/cli": "^7.4.4",
+    "@babel/core": "^7.4.5",
+    "@babel/plugin-transform-runtime": "^7.4.4",
+    "@babel/preset-env": "^7.4.5",
     "axios": "^0.18.0",
     "babel-eslint": "^10.0.1",
     "cross-env": "^5.2.0",
     "cz-conventional-changelog": "^2.1.0",
-    "eslint": "^5.14.0",
-    "eslint-config-prettier": "^4.0.0",
-    "eslint-plugin-import": "^2.16.0",
-    "eslint-plugin-prettier": "^3.0.1",
+    "eslint": "^5.16.0",
+    "eslint-config-prettier": "^4.3.0",
+    "eslint-plugin-import": "^2.17.3",
+    "eslint-plugin-prettier": "^3.1.0",
     "husky": "^1.3.1",
-    "lint-staged": "^8.1.4",
+    "jest": "^24.8.0",
+    "lint-staged": "^8.1.7",
     "npm-run-all": "^4.1.5",
-    "prettier": "^1.16.4",
-    "react": "^16.8.2",
-    "react-dom": "^16.8.2",
+    "prettier": "^1.17.1",
+    "react": "^16.8.6",
+    "react-dom": "^16.8.6",
+    "react-hooks-testing-library": "^0.5.0",
+    "react-test-renderer": "^16.8.6",
     "rimraf": "^2.6.3",
     "standard-version": "^6.0.1"
   },

src/index.test.js

@@ -0,0 +1,82 @@
+import { renderHook, act } from 'react-hooks-testing-library'
+import axios from 'axios'
+
+import useAxios from './'
+
+test('should set loading to true', async () => {
+  const { result } = renderHook(() => useAxios())
+
+  expect(result.current[0].loading).toBe(true)
+})
+
+test('should set loading to false when request completes and return data', async () => {
+  const { result, waitForNextUpdate } = renderHook(() => useAxios())
+
+  act(() => {
+    axios.resolvePromise({ data: 'whatever' })
+  })
+
+  await waitForNextUpdate()
+
+  expect(result.current[0].loading).toBe(false)
+  expect(result.current[0].data).toBe('whatever')
+})
+
+test('should set loading to false when request completes and return error', async () => {
+  const { result, waitForNextUpdate } = renderHook(() => useAxios())
+  const error = new Error('boom')
+
+  act(() => {
+    axios.rejectPromise(error)
+  })
+
+  await waitForNextUpdate()
+
+  expect(result.current[0].loading).toBe(false)
+  expect(result.current[0].error).toBe(error)
+})
+
+test('should refetch', async () => {
+  const { result, waitForNextUpdate } = renderHook(() => useAxios())
+
+  act(() => {
+    axios.resolvePromise({ data: 'whatever' })
+  })
+
+  await waitForNextUpdate()
+
+  act(() => {
+    result.current[1]()
+  })
+
+  expect(result.current[0].loading).toBe(true)
+})
+
+describe('manual option', () => {
+  test('should set loading to false', async () => {
+    const { result } = renderHook(() => useAxios('', { manual: true }))
+
+    expect(result.current[0].loading).toBe(false)
+  })
+
+  test('should execute request manually', async () => {
+    const { result, waitForNextUpdate } = renderHook(() =>
+      useAxios('', { manual: true })
+    )
+
+    act(() => {
+      result.current[1]()
+    })
+
+    expect(result.current[0].loading).toBe(true)
+
+    act(() => {
+      axios.resolvePromise({ data: 'whatever' })
+    })
+
+    await waitForNextUpdate()
+
+    expect(result.current[0].loading).toBe(false)
+    expect(result.current[0].data).toBe('whatever')
+  })
+})