From 5bd05287d43bb08df1ac95ff3c49d855ab68b817 Mon Sep 17 00:00:00 2001
From: Ben Heidemann <ben@heidemann.co.uk>
Date: Sat, 10 Apr 2021 12:16:19 +0100
Subject: [PATCH] test: add mock function create helper to utils

---
 tests/lib/test-utils.js | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/tests/lib/test-utils.js b/tests/lib/test-utils.js
index fd4461a..1d7b5c3 100644
--- a/tests/lib/test-utils.js
+++ b/tests/lib/test-utils.js
@@ -159,6 +159,24 @@ const parseBJSON = json =>
       value
   );
 
+function createMockFn(implementation = undefined) {
+  const calls = [];
+  const mockFn = function(...args) {
+    calls.push({
+      args,
+    });
+    if (typeof implementation === 'function') {
+      return implementation(...args);
+    }
+  }
+  Object.defineProperty(mockFn, 'calls', {
+    get() {
+      return calls;
+    }
+  });
+  return mockFn;
+}
+
 module.exports = {
   uniqueName: uniqueName,
   setup: setup,
@@ -172,5 +190,6 @@ module.exports = {
   cleanup: cleanup,
   typedArrayEqual: typedArrayEqual,
   parseBJSON,
-  shimIndexedDB
+  shimIndexedDB,
+  createMockFn
 };