fix: work with base64 strings (#368)

Author: smackfu

__tests__/__image_snapshots__/integration-spec-js-to-match-image-snapshot-happy-path-should-work-with-base-64-encoded-strings-1-snap.png

@@ -53,32 +53,25 @@ exports[`toMatchImageSnapshot passes diffImageToSnapshot everything it needs to
   "receivedDir": undefined,
   "receivedImageBuffer": {
     "data": [
-      112,
-      114,
-      101,
-      116,
-      101,
-      110,
-      100,
-      116,
-      104,
-      105,
-      115,
-      105,
-      115,
-      97,
-      110,
-      105,
+      166,
+      183,
+      173,
+      122,
+      119,
       109,
-      97,
-      103,
-      101,
-      98,
-      117,
-      102,
-      102,
-      101,
-      114,
+      134,
+      43,
+      34,
+      177,
+      169,
+      226,
+      153,
+      168,
+      30,
+      110,
+      231,
+      223,
+      122,
     ],
     "type": "Buffer",
   },

__tests__/__snapshots__/index.spec.js.snap

@@ -103,6 +103,11 @@ describe('toMatchImageSnapshot', () => {
       const imageTypedArray = new Uint8Array(imageData.buffer);
       expect(() => expect(imageTypedArray).toMatchImageSnapshot()).not.toThrowError();
     });
+
+    it('should work with base64 encoded strings', () => {
+      const imageString = imageData.toString('base64');
+      expect(() => expect(imageString).toMatchImageSnapshot()).not.toThrowError();
+    });
   });
 
   describe('updates', () => {

__tests__/integration.spec.js

@@ -28,6 +28,9 @@ function toBuffer(data) {
   if (data == null || Buffer.isBuffer(data)) {
     return data;
   }
+  if (typeof data === 'string') {
+    return Buffer.from(data, 'base64');
+  }
 
   return Buffer.from(data);
 }