Document fallbackMockImplementation works for mock

Author: skovhus

README.md

@@ -50,7 +50,19 @@ describe('Party Tests', () => {
 
        expect(mock.getPartyType()).toBe('west coast party');
    });
-});
+
+    test('throwing an error if we forget to specify the return value')
+        const mock = mock<PartyProvider>(
+            {},
+            {
+                fallbackMockImplementation: () => {
+                    throw new Error('not mocked');
+                },
+            }
+        );
+
+        expect(() => mock.getPartyType()).toThrowError('not mocked');
+    });
 ```
 
 ## Assigning Mocks with a Type

src/Mock.spec.ts

@@ -124,6 +124,19 @@ describe('jest-mock-extended', () => {
         expect(mockObj.getSomethingWithArgs(1, 2)).toBe(1);
     });
 
+    test('Can specify fallbackMockImplementation', () => {
+        const mockObj = mock<MockInt>(
+            {},
+            {
+                fallbackMockImplementation: () => {
+                    throw new Error('not mocked');
+                },
+            }
+        );
+
+        expect(() => mockObj.getSomethingWithArgs(1, 2)).toThrowError('not mocked');
+    });
+
     test('Can specify multiple calledWith', () => {
         const mockObj = mock<MockInt>();
         mockObj.getSomethingWithArgs.calledWith(1, 2).mockReturnValue(3);