test: fix GET image test to allow for different last-modified

Author: brett-vendia

__tests__/integration.js

@@ -210,12 +210,39 @@ describe.each(EACH_MATRIX)('%s:%s: integration tests', (eventSourceName, framewo
         'accept-ranges': ['bytes'],
         'cache-control': ['public, max-age=0'],
         'content-length': [15933],
-        'content-type': ['image/png'],
-        'etag': ['W/"3e3d-1774e01e5d1"'],
-        'last-modified': ['Fri, 29 Jan 2021 11:58:03 GMT']
+        'content-type': ['image/png']
       },
       isBase64Encoded: true
     }, { shouldConvertContentLengthToInt: true })
+    const etagRegex = /^W\/.*$/
+    const lastModifiedRegex = /^.* GMT$/
+    switch (eventSourceName) {
+      case 'alb':
+        case 'apiGatewayV1':
+        expect(response.multiValueHeaders.etag.length).toEqual(1)
+        expect(response.multiValueHeaders.etag[0]).toMatch(etagRegex)
+        expect(response.multiValueHeaders['last-modified'].length).toEqual(1)
+        expect(response.multiValueHeaders['last-modified'][0]).toMatch(lastModifiedRegex)
+        delete response.multiValueHeaders.etag
+        delete response.multiValueHeaders['last-modified']
+        break
+        case 'apiGatewayV2':
+          expect(response.headers.etag).toMatch(etagRegex)
+          expect(response.headers['last-modified']).toMatch(lastModifiedRegex)
+          delete response.headers.etag
+          delete response.headers['last-modified']
+          break
+        case 'lambdaEdge':
+          expect(response.headers.etag.length).toEqual(1)
+          expect(response.headers.etag[0].key).toMatch('etag')
+          expect(response.headers.etag[0].value).toMatch(etagRegex)
+          expect(response.headers['last-modified'].length).toEqual(1)
+          expect(response.headers['last-modified'][0].key).toMatch('last-modified')
+          expect(response.headers['last-modified'][0].value).toMatch(lastModifiedRegex)
+          delete response.headers.etag
+          delete response.headers['last-modified']
+          break
+    }
     expect(response).toEqual(expectedResponse)
   })