Skip to main content

Function: spy()

spy<T>(instanceToSpy): T

Defined in: ts-mockito.ts:47

Wraps a real object so its methods call through to the real implementation by default, while individual methods can still be stubbed with when.

Type Parameters​

T​

T

Parameters​

instanceToSpy​

T

the real object instance to spy on

Returns​

T

the spied mock; pass it to instance to get an object backed by the real one

Example​

const foo = new Foo();
const spiedFoo = spy(foo);
when(spiedFoo.getBar(3)).thenReturn('one');
console.log(foo.getBar(3)); // 'one'
console.log(foo.getBaz()); // calls the real method