Adding image snapshots for graphs

e2e/jest.config.js

@@ -0,0 +1,11 @@
+// jest.config.js
+module.exports = {
+  // verbose: true,
+  transform: {
+    '^.+\\.jsx?$': '../transformer.js'
+  },
+  preset: 'jest-puppeteer',
+  'globalSetup': 'jest-environment-puppeteer/setup',
+  'globalTeardown': 'jest-environment-puppeteer/teardown',
+  'testEnvironment': 'jest-environment-puppeteer'
+}