Add jsonrpc createClientMock

packages/jsonrpc/src/createClientMock.test.ts

@@ -0,0 +1,18 @@
+import createClientMock from './createClientMock'
+
+describe('createClientMock', () => {
+
+  interface IService {
+    add(a: number, b: number): number
+    concat(a: string, b: string): string
+  }
+
+  it('creates a mock for all methods', async () => {
+    const [client, mock] = createClientMock<IService>(['add', 'concat'])
+    mock.add.mockReturnValue(Promise.resolve(3))
+    mock.concat.mockImplementation((a, b) => Promise.resolve(a + b))
+    expect(await client.add(4, 5)).toBe(3)
+    expect(await client.concat('a', 'b')).toBe('ab')
+  })
+
+})

packages/jsonrpc/src/createClientMock.ts

@@ -0,0 +1,34 @@
+import { FunctionPropertyNames, TAsyncified } from './types'
+
+export type TMocked<T> = {
+  [K in keyof T]:
+    T[K] extends (...args: infer A) => infer R
+    ? jest.Mock<R, A>
+    : never
+}
+
+/**
+ * Creates an object with methods mocked using jest. This methods should not
+ * be exported in this module because it adds a dependency to jest, which is
+ * a dev dependency.
+ *
+ * During tests, users should require this method by writing:
+ *
+ *     import createClientMock from '@rondo.dev/jsonrpc/lib/createClientMock'
+ *
+ * @private
+ */
+export default function createClientMock<T extends object>(
+  methods: Array<FunctionPropertyNames<T>>,
+): [TAsyncified<T>, TMocked<TAsyncified<T>>] {
+  const client = methods
+  .reduce((obj, prop) => {
+    obj[prop] = jest.fn()
+    return obj
+  }, {} as any)
+
+  return [
+    client as TAsyncified<T>,
+    client as TMocked<TAsyncified<T>>,
+  ]
+}

packages/jsonrpc/tsconfig.esm.json

@@ -3,5 +3,8 @@
   "compilerOptions": {
     "outDir": "esm"
   },
-  "references": []
+  "references": [
+    {"path": "../logger/tsconfig.esm.json"},
+    {"path": "../redux/tsconfig.esm.json"}
+  ]
 }

packages/jsonrpc/tsconfig.json

@@ -6,6 +6,7 @@
     "rootDir": "src"
   },
   "references": [
-    {"path": "../logger"}
+    {"path": "../logger"},
+    {"path": "../redux"}
   ]
 }