feat(expect): toContainEqual (#52)

src/index.ts

@@ -28,6 +28,7 @@ declare global {
       toMatch(expected: string | RegExp): void
       toMatchObject(expected: any): void
       toContain(item: any): void
+      toContainEqual(item: any): void
       toBeTruthy(): void
       toBeFalsy(): void
       toBeNaN(): void

src/integrations/chai/jest-expect.ts

@@ -23,10 +23,30 @@ export function JestChaiExpect(): ChaiPlugin {
       else
         return this.match(expected)
     })
-
     utils.addMethod(proto, 'toContain', function(this: Chai.Assertion, item: any) {
       return this.contain(item)
     })
+
+    utils.addMethod(proto, 'toContainEqual', function(this: Chai.AssertionStatic, expected: any) {
+      const obj = utils.flag(this, 'object')
+      const index = Array.from(obj).findIndex((item) => {
+        try {
+          chai.assert.deepEqual(item, expected)
+        }
+        catch {
+          return false
+        }
+        return true
+      })
+
+      this.assert(
+        index !== -1,
+        'expected #{this} to deep equally contain #{exp}',
+        'expected #{this} to not deep equally contain #{exp}',
+        expected,
+      )
+    },
+    )
     utils.addMethod(proto, 'toBeTruthy', function(this: Chai.AssertionStatic) {
       const obj = utils.flag(this, 'object')
       this.assert(

test/core/test/jest-expect.test.ts

@@ -10,6 +10,10 @@ describe('jest-expect', () => {
     expect(0).toBeFalsy()
     expect('Hello').toMatch(/llo/)
     expect('Hello').toMatch('llo')
+    expect('Hello').toContain('llo')
+    expect(['Hello']).toContain('Hello')
+    expect([{ text: 'Hello' }]).toContainEqual({ text: 'Hello' })
+    expect([{ text: 'Bye' }]).not.toContainEqual({ text: 'Hello' })
   })
 
   it('object', () => {