New internal testing utility: withErrorSpy(it, "should...", ...)

src/__tests__/__snapshots__/exports.ts.snap

@@ -314,6 +314,7 @@ Array [
   "mockSingleLink",
   "stripSymbols",
   "subscribeAndCount",
+  "withErrorSpy",
 ]
 `;
 

src/utilities/testing/index.ts

@@ -13,3 +13,4 @@ export { createMockClient } from './mocking/mockClient';
 export { stripSymbols } from './stripSymbols';
 export { default as subscribeAndCount } from './subscribeAndCount';
 export { itAsync } from './itAsync';
+export { withErrorSpy } from './withErrorSpy';

src/utilities/testing/itAsync.ts

@@ -14,12 +14,13 @@ function wrap<TResult>(key?: "only" | "skip" | "todo") {
 }
 
 const wrappedIt = wrap();
-export function itAsync(...args: Parameters<typeof wrappedIt>) {
-  return wrappedIt.apply(this, args);
-}
 
-export namespace itAsync {
-  export const only = wrap("only");
-  export const skip = wrap("skip");
-  export const todo = wrap("todo");
-}
+export const itAsync = Object.assign(function (
+  ...args: Parameters<typeof wrappedIt>
+) {
+  return wrappedIt.apply(this, args);
+}, {
+  only: wrap("only"),
+  skip: wrap("skip"),
+  todo: wrap("todo"),
+});

src/utilities/testing/withErrorSpy.ts

@@ -0,0 +1,21 @@
+export function withErrorSpy<
+  TArgs extends any[],
+  TResult,
+>(
+  it: (...args: TArgs) => TResult,
+  ...args: TArgs
+) {
+  const fn = args[1];
+  args[1] = function () {
+    const args = arguments;
+    const errorSpy = jest.spyOn(console, 'error');
+    errorSpy.mockImplementation(() => {});
+    return new Promise(resolve => {
+      resolve(fn?.apply(this, args));
+    }).finally(() => {
+      expect(errorSpy).toMatchSnapshot();
+      errorSpy.mockReset();
+    });
+  };
+  return it(...args);
+}