diff --git a/core/drupalci.yml b/core/drupalci.yml
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+++ b/core/drupalci.yml
@@ -0,0 +1,57 @@
+# This is the DrupalCI testbot build file for Drupal core.
+# Learn to make one for your own drupal.org project:
+# https://www.drupal.org/drupalorg/docs/drupal-ci/customizing-drupalci-testing
+build:
+  assessment:
+    validate_codebase:
+      phplint:
+      # Re-run composer install to ensure the dependencies resolve for the
+      # containerized PHP version.
+      container_composer:
+        options: ' install --prefer-dist --no-suggest --no-progress --no-interaction'
+        halt-on-fail: true
+      csslint:
+        halt-on-fail: false
+      eslint:
+        # A test must pass eslinting standards check in order to continue processing.
+        halt-on-fail: true
+      phpcs:
+        # phpcs will use core's specified version of Coder.
+        sniff-all-files: false
+        halt-on-fail: false
+    testing:
+      # run_tests task is executed several times in order of performance speeds.
+      # halt-on-fail can be set on the run_tests tasks in order to fail fast.
+      # suppress-deprecations is false in order to be alerted to usages of
+      # deprecated code.
+      run_tests.phpunit:
+        types: 'PHPUnit-Unit'
+        testgroups: '--all'
+        suppress-deprecations: false
+        halt-on-fail: false
+      run_tests.kernel:
+        types: 'PHPUnit-Kernel'
+        testgroups: '--all'
+        suppress-deprecations: false
+        halt-on-fail: false
+      run_tests.simpletest:
+         types: 'Simpletest'
+         testgroups: '--all'
+         suppress-deprecations: false
+         halt-on-fail: false
+      run_tests.functional:
+        types: 'PHPUnit-Functional'
+        testgroups: '--all'
+        suppress-deprecations: false
+        halt-on-fail: false
+      # Functional JavaScript tests require a concurrency of 1 because there is
+      # only one instance of PhantomJS on the testbot machine.
+      run_tests.javascript:
+        concurrency: 1
+        types: 'PHPUnit-FunctionalJavascript'
+        testgroups: '--all'
+        suppress-deprecations: false
+        halt-on-fail: false
+      # Run nightwatch testing.
+      # @see https://www.drupal.org/project/drupal/issues/2869825
+      nightwatchjs: