test
方法:Jest 封装的测试方法,一般填写两个参数,测试用例描述和测试方法expect
方法:预期方法,就是你调用了什么方法,传递了什么参数,得到的预期是什么单元测试和集成测试
Asynchronous Code
钩子:
babel-jest
// For a detailed explanation regarding each configuration property, visit:// https://jestjs.io/docs/en/configuration.htmlmodule.exports = {// All imported modules in your tests should be mocked automatically// automock: false,// Stop running tests after `n` failures// bail: 0,// The directory where Jest should store its cached dependency information// cacheDirectory: "/private/var/folders/pv/cf9vq9sj6y32mtgw93mxjjfr0000gn/T/jest_dx",// Automatically clear mock calls and instances between every testclearMocks: 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: undefined,// The directory where Jest should output its coverage filescoverageDirectory: 'coverage',// An array of regexp pattern strings used to skip coverage collection// coveragePathIgnorePatterns: [// "/node_modules/"// ],// Indicates which provider should be used to instrument code for coverage// coverageProvider: "babel",// 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: undefined,// A path to a custom dependency extractor// dependencyExtractor: undefined,// 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: undefined,// A path to a module which exports an async function that is triggered once after all test suites// globalTeardown: undefined,// A set of global variables that need to be available in all test environments// globals: {},// The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.// maxWorkers: "50%",// 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 or to arrays of 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: undefined,// Run tests from one or more projects// projects: undefined,// 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: undefined,// Automatically restore mock state between every test// restoreMocks: false,// The root directory that Jest should scan for tests and modules within// rootDir: undefined,// 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: [],// The number of seconds after which a test is considered as slow and reported as such in the results.// slowTestThreshold: 5,// 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: undefined,// 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: undefined,// 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: undefined,// 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,};