Simple testing

index.js

@@ -0,0 +1,22 @@
+const log = require('lambda-log')
+const {base64Pixel, pixelSize} = require('./lib/constants')
+
+/**
+ * Serve a 1x1 pixel and log metrics
+ */
+exports.handler = async (event) => {
+  if (event.path === '/i.gif') {
+    return {
+      statusCode: 200,
+      body: base64Pixel,
+      isBase64Encoded: true,
+      headers: {'content-type': 'image/gif', 'content-length': pixelSize},
+    }
+  } else {
+    return {
+      statusCode: 404,
+      body: 'Pixel not found',
+      headers: {'content-type': 'text/plain'},
+    }
+  }
+}

index.test.js

@@ -0,0 +1,21 @@
+const {handler} = require('./index')
+
+describe('index', () => {
+
+  it('returns 404s for unknown paths', async () => {
+    expect(await handler({})).toMatchObject({statusCode: 404})
+    expect(await handler({path: '/any/path'})).toMatchObject({statusCode: 404})
+    expect(await handler({path: '/any/i.gif'})).toMatchObject({statusCode: 404})
+    expect(await handler({path: '/i.png'})).toMatchObject({statusCode: 404})
+  })
+
+  it('returns a pixel', async () => {
+    const resp = await handler({path: '/i.gif'})
+    expect(resp.statusCode).toEqual(200)
+    expect(resp.headers['content-type']).toEqual('image/gif')
+    expect(resp.headers['content-length']).toEqual(35)
+    expect(resp.isBase64Encoded).toEqual(true)
+    expect(new Buffer(resp.body, 'base64').byteLength).toEqual(35)
+  })
+
+})

lib/constants.js

@@ -0,0 +1,8 @@
+exports.pixel = Buffer.from([
+  0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x01, 0x00, 0x01, 0x00,
+  0x80, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x2c,
+  0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x02,
+  0x02, 0x44, 0x01, 0x00, 0x3b,
+])
+exports.pixelSize = Buffer.byteLength(exports.pixel)
+exports.base64Pixel = exports.pixel.toString('base64')

package.json

@@ -26,6 +26,9 @@
     "url": "https://github.com/PRX/pixel.prx.org/issues"
   },
   "homepage": "https://github.com/PRX/pixel.prx.org",
+  "dependencies": {
+    "lambda-log": "^2.2.0"
+  },
   "devDependencies": {
     "express": "^4.16.4",
     "jest": "^24.7.1",

yarn.lock

@@ -2175,7 +2175,7 @@ json-schema@0.2.3:
   version "0.2.3"
   resolved "https://registry.yarnpkg.com/json-schema/-/json-schema-0.2.3.tgz#b480c892e59a2f05954ce727bd3f2a4e882f9e13"
 
-json-stringify-safe@~5.0.1:
+json-stringify-safe@^5.0.1, json-stringify-safe@~5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz#1296a2d58fd45f19a0f6ce01d65701e2c735b6eb"
 
@@ -2218,6 +2218,13 @@ kleur@^3.0.2:
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/kleur/-/kleur-3.0.3.tgz#a79c9ecc86ee1ce3fa6206d1216c501f147fc07e"
 
+lambda-log@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/lambda-log/-/lambda-log-2.2.0.tgz#39981bbded4fc2ed4f71f8b0c0c4682971a8d9c1"
+  integrity sha512-RM2NiHkz7ahL1TLBuDBnPy4G1BtA1rn25/YVvCidC3agjvnCPU6g1awYiHAEEnTt6ah93Ay/7oMULQrCuPeUdA==
+  dependencies:
+    json-stringify-safe "^5.0.1"
+
 latest-version@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/latest-version/-/latest-version-3.1.0.tgz#a205383fea322b33b5ae3b18abee0dc2f356ee15"