1 files changed, 53 insertions, 0 deletions
diff --git a/activesupport/test/cache/behaviors/connection_pool_behavior.rb b/activesupport/test/cache/behaviors/connection_pool_behavior.rb
new file mode 100644
index 0000000000..500d51a134
--- /dev/null
+++ b/activesupport/test/cache/behaviors/connection_pool_behavior.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+module ConnectionPoolBehavior
+  def test_connection_pool
+    emulating_latency do
+      begin
+        cache = ActiveSupport::Cache.lookup_store(store, pool_size: 2, pool_timeout: 1)
+        cache.clear
+
+        threads = []
+
+        assert_raises Timeout::Error do
+          # One of the three threads will fail in 1 second because our pool size
+          # is only two.
+          3.times do
+            threads << Thread.new do
+              cache.read("latency")
+            end
+          end
+
+          threads.each(&:join)
+        end
+      ensure
+        threads.each(&:kill)
+      end
+    end
+  end
+
+  def test_no_connection_pool
+    emulating_latency do
+      begin
+        cache = ActiveSupport::Cache.lookup_store(store)
+        cache.clear
+
+        threads = []
+
+        assert_nothing_raised do
+          # Default connection pool size is 5, assuming 10 will make sure that
+          # the connection pool isn't used at all.
+          10.times do
+            threads << Thread.new do
+              cache.read("latency")
+            end
+          end
+
+          threads.each(&:join)
+        end
+      ensure
+        threads.each(&:kill)
+      end
+    end
+  end
+end