first commit

server-ce/test/cypress/.gitignore

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+downloads/
+results/
+data/

server-ce/test/cypress/support/e2e.js

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+import '@testing-library/cypress/add-commands'
+
+Cypress.on('uncaught:exception', (err, runnable) => {
+  if (err.message.includes('ResizeObserver')) {
+    // spurious error from PDF preview
+    return false
+  }
+  if (err.message.includes('rcube_webmail')) {
+    // spurious error from mailtrap
+    return false
+  }
+})