Upgrade jest to 23.4.1 (#537)

Flow types regenerated via flow-typed install jest@23.4.1

Test plan: Travis

flow-typed/npm/jest_v23.x.x.js

@@ -1,5 +1,5 @@
-// flow-typed signature: 6e1fc0a644aa956f79029fec0709e597
-// flow-typed version: 07ebad4796/jest_v22.x.x/flow_>=v0.39.x
+// flow-typed signature: ad251f3a3446f6ab4e6691a94e701cad
+// flow-typed version: caa120caaa/jest_v23.x.x/flow_>=v0.39.x
 
 type JestMockFn<TArguments: $ReadOnlyArray<*>, TReturn> = {
   (...args: TArguments): TReturn,
@@ -55,18 +55,39 @@ type JestMockFn<TArguments: $ReadOnlyArray<*>, TReturn> = {
   mockImplementationOnce(
     fn: (...args: TArguments) => TReturn
   ): JestMockFn<TArguments, TReturn>,
+  /**
+   * Accepts a string to use in test result output in place of "jest.fn()" to
+   * indicate which mock function is being referenced.
+   */
+  mockName(name: string): JestMockFn<TArguments, TReturn>,
   /**
    * Just a simple sugar function for returning `this`
    */
   mockReturnThis(): void,
   /**
-   * Deprecated: use jest.fn(() => value) instead
+   * Accepts a value that will be returned whenever the mock function is called.
    */
   mockReturnValue(value: TReturn): JestMockFn<TArguments, TReturn>,
   /**
    * Sugar for only returning a value once inside your mock
    */
-  mockReturnValueOnce(value: TReturn): JestMockFn<TArguments, TReturn>
+  mockReturnValueOnce(value: TReturn): JestMockFn<TArguments, TReturn>,
+  /**
+   * Sugar for jest.fn().mockImplementation(() => Promise.resolve(value))
+   */
+  mockResolvedValue(value: TReturn): JestMockFn<TArguments, Promise<TReturn>>,
+  /**
+   * Sugar for jest.fn().mockImplementationOnce(() => Promise.resolve(value))
+   */
+  mockResolvedValueOnce(value: TReturn): JestMockFn<TArguments, Promise<TReturn>>,
+  /**
+   * Sugar for jest.fn().mockImplementation(() => Promise.reject(value))
+   */
+  mockRejectedValue(value: TReturn): JestMockFn<TArguments, Promise<any>>,
+  /**
+   * Sugar for jest.fn().mockImplementationOnce(() => Promise.reject(value))
+   */
+  mockRejectedValueOnce(value: TReturn): JestMockFn<TArguments, Promise<any>>
 };
 
 type JestAsymmetricEqualityType = {
@@ -113,6 +134,36 @@ type JestPromiseType = {
   resolves: JestExpectType
 };
 
+/**
+ * Jest allows functions and classes to be used as test names in test() and
+ * describe()
+ */
+type JestTestName = string | Function;
+
+/**
+ *  Plugin: jest-styled-components
+ */
+
+type JestStyledComponentsMatcherValue =
+  | string
+  | JestAsymmetricEqualityType
+  | RegExp
+  | typeof undefined;
+
+type JestStyledComponentsMatcherOptions = {
+  media?: string;
+  modifier?: string;
+  supports?: string;
+}
+
+type JestStyledComponentsMatchersType = {
+  toHaveStyleRule(
+    property: string,
+    value: JestStyledComponentsMatcherValue,
+    options?: JestStyledComponentsMatcherOptions
+  ): void,
+};
+
 /**
  *  Plugin: jest-enzyme
  */
@@ -120,14 +171,16 @@ type EnzymeMatchersType = {
   toBeChecked(): void,
   toBeDisabled(): void,
   toBeEmpty(): void,
+  toBeEmptyRender(): void,
   toBePresent(): void,
   toContainReact(element: React$Element<any>): void,
+  toExist(): void,
   toHaveClassName(className: string): void,
   toHaveHTML(html: string): void,
-  toHaveProp(propKey: string, propValue?: any): void,
+  toHaveProp: ((propKey: string, propValue?: any) => void) & ((props: Object) => void),
   toHaveRef(refName: string): void,
-  toHaveState(stateKey: string, stateValue?: any): void,
-  toHaveStyle(styleKey: string, styleValue?: any): void,
+  toHaveState: ((stateKey: string, stateValue?: any) => void) & ((state: Object) => void),
+  toHaveStyle: ((styleKey: string, styleValue?: any) => void) & ((style: Object) => void),
   toHaveTagName(tagName: string): void,
   toHaveText(text: string): void,
   toIncludeText(text: string): void,
@@ -136,8 +189,348 @@ type EnzymeMatchersType = {
   toMatchSelector(selector: string): void
 };
 
-type JestExpectType = {
-  not: JestExpectType & EnzymeMatchersType,
+// DOM testing library extensions https://github.com/kentcdodds/dom-testing-library#custom-jest-matchers
+type DomTestingLibraryType = {
+  toBeInTheDOM(): void,
+  toHaveTextContent(content: string): void,
+  toHaveAttribute(name: string, expectedValue?: string): void
+};
+
+// Jest JQuery Matchers: https://github.com/unindented/custom-jquery-matchers
+type JestJQueryMatchersType = {
+  toExist(): void,
+  toHaveLength(len: number): void,
+  toHaveId(id: string): void,
+  toHaveClass(className: string): void,
+  toHaveTag(tag: string): void,
+  toHaveAttr(key: string, val?: any): void,
+  toHaveProp(key: string, val?: any): void,
+  toHaveText(text: string | RegExp): void,
+  toHaveData(key: string, val?: any): void,
+  toHaveValue(val: any): void,
+  toHaveCss(css: {[key: string]: any}): void,
+  toBeChecked(): void,
+  toBeDisabled(): void,
+  toBeEmpty(): void,
+  toBeHidden(): void,
+  toBeSelected(): void,
+  toBeVisible(): void,
+  toBeFocused(): void,
+  toBeInDom(): void,
+  toBeMatchedBy(sel: string): void,
+  toHaveDescendant(sel: string): void,
+  toHaveDescendantWithText(sel: string, text: string | RegExp): void
+};
+
+
+// Jest Extended Matchers: https://github.com/jest-community/jest-extended
+type JestExtendedMatchersType = {
+  /**
+     * Note: Currently unimplemented
+     * Passing assertion
+     *
+     * @param {String} message
+     */
+  //  pass(message: string): void;
+
+    /**
+     * Note: Currently unimplemented
+     * Failing assertion
+     *
+     * @param {String} message
+     */
+  //  fail(message: string): void;
+
+    /**
+     * Use .toBeEmpty when checking if a String '', Array [] or Object {} is empty.
+     */
+    toBeEmpty(): void;
+
+    /**
+     * Use .toBeOneOf when checking if a value is a member of a given Array.
+     * @param {Array.<*>} members
+     */
+    toBeOneOf(members: any[]): void;
+
+    /**
+     * Use `.toBeNil` when checking a value is `null` or `undefined`.
+     */
+    toBeNil(): void;
+
+    /**
+     * Use `.toSatisfy` when you want to use a custom matcher by supplying a predicate function that returns a `Boolean`.
+     * @param {Function} predicate
+     */
+    toSatisfy(predicate: (n: any) => boolean): void;
+
+    /**
+     * Use `.toBeArray` when checking if a value is an `Array`.
+     */
+    toBeArray(): void;
+
+    /**
+     * Use `.toBeArrayOfSize` when checking if a value is an `Array` of size x.
+     * @param {Number} x
+     */
+    toBeArrayOfSize(x: number): void;
+
+    /**
+     * Use `.toIncludeAllMembers` when checking if an `Array` contains all of the same members of a given set.
+     * @param {Array.<*>} members
+     */
+    toIncludeAllMembers(members: any[]): void;
+
+    /**
+     * Use `.toIncludeAnyMembers` when checking if an `Array` contains any of the members of a given set.
+     * @param {Array.<*>} members
+     */
+    toIncludeAnyMembers(members: any[]): void;
+
+    /**
+     * Use `.toSatisfyAll` when you want to use a custom matcher by supplying a predicate function that returns a `Boolean` for all values in an array.
+     * @param {Function} predicate
+     */
+    toSatisfyAll(predicate: (n: any) => boolean): void;
+
+    /**
+     * Use `.toBeBoolean` when checking if a value is a `Boolean`.
+     */
+    toBeBoolean(): void;
+
+    /**
+     * Use `.toBeTrue` when checking a value is equal (===) to `true`.
+     */
+    toBeTrue(): void;
+
+    /**
+     * Use `.toBeFalse` when checking a value is equal (===) to `false`.
+     */
+    toBeFalse(): void;
+
+    /**
+     * Use .toBeDate when checking if a value is a Date.
+     */
+    toBeDate(): void;
+
+    /**
+     * Use `.toBeFunction` when checking if a value is a `Function`.
+     */
+    toBeFunction(): void;
+
+    /**
+     * Use `.toHaveBeenCalledBefore` when checking if a `Mock` was called before another `Mock`.
+     *
+     * Note: Required Jest version >22
+     * Note: Your mock functions will have to be asynchronous to cause the timestamps inside of Jest to occur in a differentJS event loop, otherwise the mock timestamps will all be the same
+     *
+     * @param {Mock} mock
+     */
+    toHaveBeenCalledBefore(mock: JestMockFn<any, any>): void;
+
+    /**
+     * Use `.toBeNumber` when checking if a value is a `Number`.
+     */
+    toBeNumber(): void;
+
+    /**
+     * Use `.toBeNaN` when checking a value is `NaN`.
+     */
+    toBeNaN(): void;
+
+    /**
+     * Use `.toBeFinite` when checking if a value is a `Number`, not `NaN` or `Infinity`.
+     */
+    toBeFinite(): void;
+
+    /**
+     * Use `.toBePositive` when checking if a value is a positive `Number`.
+     */
+    toBePositive(): void;
+
+    /**
+     * Use `.toBeNegative` when checking if a value is a negative `Number`.
+     */
+    toBeNegative(): void;
+
+    /**
+     * Use `.toBeEven` when checking if a value is an even `Number`.
+     */
+    toBeEven(): void;
+
+    /**
+     * Use `.toBeOdd` when checking if a value is an odd `Number`.
+     */
+    toBeOdd(): void;
+
+    /**
+     * Use `.toBeWithin` when checking if a number is in between the given bounds of: start (inclusive) and end (exclusive).
+     *
+     * @param {Number} start
+     * @param {Number} end
+     */
+    toBeWithin(start: number, end: number): void;
+
+    /**
+     * Use `.toBeObject` when checking if a value is an `Object`.
+     */
+    toBeObject(): void;
+
+    /**
+     * Use `.toContainKey` when checking if an object contains the provided key.
+     *
+     * @param {String} key
+     */
+    toContainKey(key: string): void;
+
+    /**
+     * Use `.toContainKeys` when checking if an object has all of the provided keys.
+     *
+     * @param {Array.<String>} keys
+     */
+    toContainKeys(keys: string[]): void;
+
+    /**
+     * Use `.toContainAllKeys` when checking if an object only contains all of the provided keys.
+     *
+     * @param {Array.<String>} keys
+     */
+    toContainAllKeys(keys: string[]): void;
+
+    /**
+     * Use `.toContainAnyKeys` when checking if an object contains at least one of the provided keys.
+     *
+     * @param {Array.<String>} keys
+     */
+    toContainAnyKeys(keys: string[]): void;
+
+    /**
+     * Use `.toContainValue` when checking if an object contains the provided value.
+     *
+     * @param {*} value
+     */
+    toContainValue(value: any): void;
+
+    /**
+     * Use `.toContainValues` when checking if an object contains all of the provided values.
+     *
+     * @param {Array.<*>} values
+     */
+    toContainValues(values: any[]): void;
+
+    /**
+     * Use `.toContainAllValues` when checking if an object only contains all of the provided values.
+     *
+     * @param {Array.<*>} values
+     */
+    toContainAllValues(values: any[]): void;
+
+    /**
+     * Use `.toContainAnyValues` when checking if an object contains at least one of the provided values.
+     *
+     * @param {Array.<*>} values
+     */
+    toContainAnyValues(values: any[]): void;
+
+    /**
+     * Use `.toContainEntry` when checking if an object contains the provided entry.
+     *
+     * @param {Array.<String, String>} entry
+     */
+    toContainEntry(entry: [string, string]): void;
+
+    /**
+     * Use `.toContainEntries` when checking if an object contains all of the provided entries.
+     *
+     * @param {Array.<Array.<String, String>>} entries
+     */
+    toContainEntries(entries: [string, string][]): void;
+
+    /**
+     * Use `.toContainAllEntries` when checking if an object only contains all of the provided entries.
+     *
+     * @param {Array.<Array.<String, String>>} entries
+     */
+    toContainAllEntries(entries: [string, string][]): void;
+
+    /**
+     * Use `.toContainAnyEntries` when checking if an object contains at least one of the provided entries.
+     *
+     * @param {Array.<Array.<String, String>>} entries
+     */
+    toContainAnyEntries(entries: [string, string][]): void;
+
+    /**
+     * Use `.toBeExtensible` when checking if an object is extensible.
+     */
+    toBeExtensible(): void;
+
+    /**
+     * Use `.toBeFrozen` when checking if an object is frozen.
+     */
+    toBeFrozen(): void;
+
+    /**
+     * Use `.toBeSealed` when checking if an object is sealed.
+     */
+    toBeSealed(): void;
+
+    /**
+     * Use `.toBeString` when checking if a value is a `String`.
+     */
+    toBeString(): void;
+
+    /**
+     * Use `.toEqualCaseInsensitive` when checking if a string is equal (===) to another ignoring the casing of both strings.
+     *
+     * @param {String} string
+     */
+    toEqualCaseInsensitive(string: string): void;
+
+    /**
+     * Use `.toStartWith` when checking if a `String` starts with a given `String` prefix.
+     *
+     * @param {String} prefix
+     */
+    toStartWith(prefix: string): void;
+
+    /**
+     * Use `.toEndWith` when checking if a `String` ends with a given `String` suffix.
+     *
+     * @param {String} suffix
+     */
+    toEndWith(suffix: string): void;
+
+    /**
+     * Use `.toInclude` when checking if a `String` includes the given `String` substring.
+     *
+     * @param {String} substring
+     */
+    toInclude(substring: string): void;
+
+    /**
+     * Use `.toIncludeRepeated` when checking if a `String` includes the given `String` substring the correct number of times.
+     *
+     * @param {String} substring
+     * @param {Number} times
+     */
+    toIncludeRepeated(substring: string, times: number): void;
+
+    /**
+     * Use `.toIncludeMultiple` when checking if a `String` includes all of the given substrings.
+     *
+     * @param {Array.<String>} substring
+     */
+    toIncludeMultiple(substring: string[]): void;
+};
+
+interface JestExpectType {
+  not:
+    & JestExpectType
+    & EnzymeMatchersType
+    & DomTestingLibraryType
+    & JestJQueryMatchersType
+    & JestStyledComponentsMatchersType
+    & JestExtendedMatchersType,
   /**
    * If you have a mock function, you can use .lastCalledWith to test what
    * arguments it was last called with.
@@ -148,10 +541,6 @@ type JestExpectType = {
    * strict equality.
    */
   toBe(value: any): void,
-  /**
-   * Use .toHaveBeenCalled to ensure that a mock function got called.
-   */
-  toBeCalled(): void,
   /**
    * Use .toBeCalledWith to ensure that a mock function was called with
    * specific arguments.
@@ -227,21 +616,55 @@ type JestExpectType = {
    * Use .toHaveBeenCalled to ensure that a mock function got called.
    */
   toHaveBeenCalled(): void,
+  toBeCalled(): void;
   /**
    * Use .toHaveBeenCalledTimes to ensure that a mock function got called exact
    * number of times.
    */
   toHaveBeenCalledTimes(number: number): void,
+  toBeCalledTimes(number: number): void;
+  /**
+   *
+   */
+  toHaveBeenNthCalledWith(nthCall: number, ...args: Array<any>): void;
+  nthCalledWith(nthCall: number, ...args: Array<any>): void;
+  /**
+   *
+   */
+  toHaveReturned(): void;
+  toReturn(): void;
+  /**
+   *
+   */
+  toHaveReturnedTimes(number: number): void;
+  toReturnTimes(number: number): void;
+  /**
+   *
+   */
+  toHaveReturnedWith(value: any): void;
+  toReturnWith(value: any): void;
+  /**
+   *
+   */
+  toHaveLastReturnedWith(value: any): void;
+  lastReturnedWith(value: any): void;
+  /**
+   *
+   */
+  toHaveNthReturnedWith(nthCall: number, value: any): void;
+  nthReturnedWith(nthCall: number, value: any): void;
   /**
    * Use .toHaveBeenCalledWith to ensure that a mock function was called with
    * specific arguments.
    */
   toHaveBeenCalledWith(...args: Array<any>): void,
+  toBeCalledWith(...args: Array<any>): void,
   /**
    * Use .toHaveBeenLastCalledWith to ensure that a mock function was last called
    * with specific arguments.
    */
   toHaveBeenLastCalledWith(...args: Array<any>): void,
+  lastCalledWith(...args: Array<any>): void,
   /**
    * Check that an object has a .length property and it is set to a certain
    * numeric value.
@@ -260,9 +683,17 @@ type JestExpectType = {
    */
   toMatchObject(object: Object | Array<Object>): void,
   /**
-   * This ensures that a React component matches the most recent snapshot.
+   * Use .toStrictEqual to check that a javascript object matches a subset of the properties of an object.
    */
-  toMatchSnapshot(name?: string): void,
+  toStrictEqual(value: any): void,
+  /**
+   * This ensures that an Object matches the most recent snapshot.
+   */
+  toMatchSnapshot(propertyMatchers?: {[key: string]: JestAsymmetricEqualityType}, name?: string): void,
+  /**
+   * This ensures that an Object matches the most recent snapshot.
+   */
+  toMatchSnapshot(name: string): void,
   /**
    * Use .toThrow to test that a function throws when it is called.
    * If you want to test that a specific error gets thrown, you can provide an
@@ -278,7 +709,7 @@ type JestExpectType = {
    * matching the most recent snapshot when it is called.
    */
   toThrowErrorMatchingSnapshot(): void
-};
+}
 
 type JestObjectType = {
   /**
@@ -391,6 +822,13 @@ type JestObjectType = {
    * Executes only the macro task queue (i.e. all tasks queued by setTimeout()
    * or setInterval() and setImmediate()).
    */
+  advanceTimersByTime(msToRun: number): void,
+  /**
+   * Executes only the macro task queue (i.e. all tasks queued by setTimeout()
+   * or setInterval() and setImmediate()).
+   *
+   * Renamed to `advanceTimersByTime`.
+   */
   runTimersToTime(msToRun: number): void,
   /**
    * Executes only the macro-tasks that are currently pending (i.e., only the
@@ -424,7 +862,7 @@ type JestObjectType = {
    * Creates a mock function similar to jest.fn but also tracks calls to
    * object[methodName].
    */
-  spyOn(object: Object, methodName: string): JestMockFn<any, any>,
+  spyOn(object: Object, methodName: string, accessType?: "get" | "set"): JestMockFn<any, any>,
   /**
    * Set the default timeout interval for tests and before/after hooks in milliseconds.
    * Note: The default timeout interval is 5 seconds if this method is not called.
@@ -462,17 +900,17 @@ declare var describe: {
   /**
    * Creates a block that groups together several related tests in one "test suite"
    */
-  (name: string, fn: () => void): void,
+  (name: JestTestName, fn: () => void): void,
 
   /**
    * Only run this describe block
    */
-  only(name: string, fn: () => void): void,
+  only(name: JestTestName, fn: () => void): void,
 
   /**
    * Skip running this describe block
    */
-  skip(name: string, fn: () => void): void
+  skip(name: JestTestName, fn: () => void): void
 };
 
 /** An individual test unit */
@@ -480,54 +918,72 @@ declare var it: {
   /**
    * An individual test unit
    *
-   * @param {string} Name of Test
+   * @param {JestTestName} Name of Test
    * @param {Function} Test
    * @param {number} Timeout for the test, in milliseconds.
    */
   (
-    name: string,
+    name: JestTestName,
     fn?: (done: () => void) => ?Promise<mixed>,
     timeout?: number
   ): void,
+  /**
+   * each runs this test against array of argument arrays per each run
+   *
+   * @param {table} table of Test
+   */
+  each(
+    table: Array<Array<mixed>>
+  ): (
+    name: JestTestName,
+    fn?: (...args: Array<any>) => ?Promise<mixed>
+  ) => void,
   /**
    * Only run this test
    *
-   * @param {string} Name of Test
+   * @param {JestTestName} Name of Test
    * @param {Function} Test
    * @param {number} Timeout for the test, in milliseconds.
    */
   only(
-    name: string,
+    name: JestTestName,
     fn?: (done: () => void) => ?Promise<mixed>,
     timeout?: number
-  ): void,
+  ): {
+    each(
+      table: Array<Array<mixed>>
+    ): (
+      name: JestTestName,
+      fn?: (...args: Array<any>) => ?Promise<mixed>
+    ) => void,
+  },
   /**
    * Skip running this test
    *
-   * @param {string} Name of Test
+   * @param {JestTestName} Name of Test
    * @param {Function} Test
    * @param {number} Timeout for the test, in milliseconds.
    */
   skip(
-    name: string,
+    name: JestTestName,
     fn?: (done: () => void) => ?Promise<mixed>,
     timeout?: number
   ): void,
   /**
    * Run the test concurrently
    *
-   * @param {string} Name of Test
+   * @param {JestTestName} Name of Test
    * @param {Function} Test
    * @param {number} Timeout for the test, in milliseconds.
    */
   concurrent(
-    name: string,
+    name: JestTestName,
     fn?: (done: () => void) => ?Promise<mixed>,
     timeout?: number
   ): void
 };
 declare function fit(
-  name: string,
+  name: JestTestName,
   fn: (done: () => void) => ?Promise<mixed>,
   timeout?: number
 ): void;
@@ -542,23 +998,83 @@ declare var xit: typeof it;
 /** A disabled individual test */
 declare var xtest: typeof it;
 
+type JestPrettyFormatColors = {
+  comment: { close: string, open: string },
+  content: { close: string, open: string },
+  prop: { close: string, open: string },
+  tag: { close: string, open: string },
+  value: { close: string, open: string },
+};
+
+type JestPrettyFormatIndent = string => string;
+type JestPrettyFormatRefs = Array<any>;
+type JestPrettyFormatPrint = any => string;
+type JestPrettyFormatStringOrNull = string | null;
+
+type JestPrettyFormatOptions = {|
+  callToJSON: boolean,
+  edgeSpacing: string,
+  escapeRegex: boolean,
+  highlight: boolean,
+  indent: number,
+  maxDepth: number,
+  min: boolean,
+  plugins: JestPrettyFormatPlugins,
+  printFunctionName: boolean,
+  spacing: string,
+  theme: {|
+    comment: string,
+    content: string,
+    prop: string,
+    tag: string,
+    value: string,
+  |},
+|};
+
+type JestPrettyFormatPlugin = {
+  print: (
+    val: any,
+    serialize: JestPrettyFormatPrint,
+    indent: JestPrettyFormatIndent,
+    opts: JestPrettyFormatOptions,
+    colors: JestPrettyFormatColors,
+  ) => string,
+  test: any => boolean,
+};
+
+type JestPrettyFormatPlugins = Array<JestPrettyFormatPlugin>;
+
 /** The expect function is used every time you want to test a value */
 declare var expect: {
   /** The object that you want to make assertions against */
-  (value: any): JestExpectType & JestPromiseType & EnzymeMatchersType,
+  (value: any):
+    & JestExpectType
+    & JestPromiseType
+    & EnzymeMatchersType
+    & DomTestingLibraryType
+    & JestJQueryMatchersType
+    & JestStyledComponentsMatchersType
+    & JestExtendedMatchersType,
+
   /** Add additional Jasmine matchers to Jest's roster */
   extend(matchers: { [name: string]: JestMatcher }): void,
   /** Add a module that formats application-specific data structures. */
-  addSnapshotSerializer(serializer: (input: Object) => string): void,
+  addSnapshotSerializer(pluginModule: JestPrettyFormatPlugin): void,
   assertions(expectedAssertions: number): void,
   hasAssertions(): void,
   any(value: mixed): JestAsymmetricEqualityType,
-  anything(): void,
-  arrayContaining(value: Array<mixed>): void,
-  objectContaining(value: Object): void,
+  anything(): any,
+  arrayContaining(value: Array<mixed>): Array<mixed>,
+  objectContaining(value: Object): Object,
   /** Matches any received string that contains the exact expected string. */
-  stringContaining(value: string): void,
-  stringMatching(value: string | RegExp): void
+  stringContaining(value: string): string,
+  stringMatching(value: string | RegExp): string,
+  not: {
+    arrayContaining: (value: $ReadOnlyArray<mixed>) => Array<mixed>,
+    objectContaining: (value: {}) => Object,
+    stringContaining: (value: string) => string,
+    stringMatching: (value: string | RegExp) => string,
+  },
 };
 
 // TODO handle return type
@@ -575,14 +1091,14 @@ declare var jest: JestObjectType;
 declare var jasmine: {
   DEFAULT_TIMEOUT_INTERVAL: number,
   any(value: mixed): JestAsymmetricEqualityType,
-  anything(): void,
-  arrayContaining(value: Array<mixed>): void,
+  anything(): any,
+  arrayContaining(value: Array<mixed>): Array<mixed>,
   clock(): JestClockType,
   createSpy(name: string): JestSpyType,
   createSpyObj(
     baseName: string,
     methodNames: Array<string>
   ): { [methodName: string]: JestSpyType },
-  objectContaining(value: Object): void,
-  stringMatching(value: string): void
+  objectContaining(value: Object): Object,
+  stringMatching(value: string): string
 };

package.json

@@ -36,7 +36,7 @@
     "fs-extra": "3.0.1",
     "html-webpack-plugin": "2.29.0",
     "isomorphic-fetch": "^2.2.1",
-    "jest": "20.0.4",
+    "jest": "23.4.1",
     "json-stable-stringify": "^1.0.1",
     "lodash.clonedeep": "^4.5.0",
     "lodash.isequal": "^4.5.0",