Add retry behavior to help with persistently flaky tests.

Gemfile

@@ -17,6 +17,9 @@ gem "minitest-reporters", "~> 1.6.0"
 # For an "after_all" callback.
 gem "minitest-hooks", "~> 1.5.0"
 
+# Retry certain flaky tests.
+gem "minitest-retry", "~> 0.2.2"
+
 # Test metadata for CI environment.
 gem "minitest-ci", "~> 3.4.0"
 

Gemfile.lock

@@ -105,6 +105,8 @@ GEM
       builder
       minitest (>= 5.0)
       ruby-progressbar
+    minitest-retry (0.2.2)
+      minitest (>= 5.0)
     minitest-sprint (1.2.2)
       path_expander (~> 1.1)
     multi_json (1.15.0)
@@ -213,6 +215,7 @@ DEPENDENCIES
   minitest-ci (~> 3.4.0)
   minitest-hooks (~> 1.5.0)
   minitest-reporters (~> 1.6.0)
+  minitest-retry (~> 0.2.2)
   minitest-sprint (~> 1.2.0)
   multi_json (~> 1.15.0)
   net-smtp (~> 0.5.0)

test/support/retry.rb

@@ -0,0 +1,13 @@
+# While not ideal, retry certain flaky tests in CI.
+if ENV["CI"] == "true"
+  require "minitest/retry"
+  Minitest::Retry.use!(
+    methods_to_retry: [
+      "Test::AdminUi::TestApis#test_form",
+    ],
+
+    exceptions_to_retry: [
+      Selenium::WebDriver::Error::UnknownError,
+    ],
+  )
+end