fix(expect): objectContaining should recurse into sub-objects (jestjs#10508)

Author: ioancole

CHANGELOG.md

@@ -6,7 +6,8 @@
 
 ### Fixes
 
-- `[jest-mock]` Allow to mock methods in getters (TypeScript 3.9 export)
+- `[expect]` Fix `objectContaining` to work recursively into sub-objects ([#10508](https://github.com/facebook/jest/pull/10508))
+- `[jest-mock]` Allow to mock methods in getters (TypeScript 3.9 export) ([#10156](https://github.com/facebook/jest/pull/10156))
 
 ### Chore & Maintenance
 

packages/expect/src/__tests__/asymmetricMatchers.test.ts

@@ -163,6 +163,9 @@ test('ObjectContaining matches', () => {
     objectContaining({}).asymmetricMatch('jest'),
     objectContaining({foo: 'foo'}).asymmetricMatch({foo: 'foo', jest: 'jest'}),
     objectContaining({foo: undefined}).asymmetricMatch({foo: undefined}),
+    objectContaining({foo: {bar: [1]}}).asymmetricMatch({
+      foo: {bar: [1], qux: []},
+    }),
     objectContaining({first: objectContaining({second: {}})}).asymmetricMatch({
       first: {second: {}},
     }),

packages/expect/src/asymmetricMatchers.ts

@@ -178,6 +178,15 @@ class ObjectContaining extends AsymmetricMatcher<Record<string, unknown>> {
       return true;
     } else {
       for (const property in this.sample) {
+        if (
+          typeof this.sample[property] === 'object' &&
+          !(this.sample[property] instanceof AsymmetricMatcher)
+        ) {
+          this.sample[property] = objectContaining(
+            this.sample[property] as Record<string, unknown>,
+          );
+        }
+
         if (
           !hasProperty(other, property) ||
           !equals(this.sample[property], other[property])