Add Sinon snippets

Author: robinjmurphy

README.md

@@ -636,6 +636,28 @@ function (err, req, res, next) {
 }
 ```
 
+### Sinon
+
+#### `sbc⇥` sandbox.create
+```js
+sinon.sandbox.create();
+```
+
+#### `sbr⇥` sandbox.restore
+```js
+sandbox.restore();
+```
+
+#### `ac⇥` assert.called
+```js
+sinon.assert.called({1:spy});
+```
+
+#### `acw⇥` assert.calledWith
+```js
+sinon.assert.calledWith({1:spy}, {2:args});
+```
+
 ### Miscellaneous
 
 #### `us⇥` use strict

snippets/sinon.cson

@@ -0,0 +1,13 @@
+".source.js, .source.ts, .source.tsx, .source.js-semantic":
+  "sinon sandbox.create":
+    prefix: "sbc"
+    body: "sinon.sandbox.create();"
+  "sinon sandbox.restore":
+    prefix: "sbr"
+    body: "sandbox.restore();"
+  "sinon assert.called":
+    prefix: "ac"
+    body: "sinon.assert.called(${1:spy});"
+  "sinon assert.calledWith":
+    prefix: "acw"
+    body: "sinon.assert.calledWith(${1:spy}, ${2:args});"