Add sinon package for mocking

node_modules/@sinonjs/commons/CHANGES.md

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+# Changes
+
+## 1.8.0
+
+- [`4282205`](https://github.com/sinonjs/commons/commit/4282205343a4dcde2a35ccf2a8c2094300dad369)
+  Emit deprecationg warnings in node, and keep console info in browsers (mshaaban0)
+
+_Released on 2020-05-20._
+
+## 1.7.2
+
+- [`76ad9c1`](https://github.com/sinonjs/commons/commit/76ad9c16bad29f72420ed55bdf45b65d076108c8)
+  Fix generators causing exceptions in function-name (Sebastian Mayr)
+
+_Released on 2020-04-08._
+
+## 1.7.1
+
+- [`0486d25`](https://github.com/sinonjs/commons/commit/0486d250ecec9b5f9aa2210357767e413f4162d3)
+  Upgrade eslint-config-sinon, add eslint-plugin-jsdoc (Morgan Roderick)
+    >
+    > This adds linting of jsdoc
+    >
+
+_Released on 2020-02-19._