1 files changed, 58 insertions, 0 deletions
diff --git a/activerecord/test/cases/connection_adapters/adapter_leasing_test.rb b/activerecord/test/cases/connection_adapters/adapter_leasing_test.rb
new file mode 100644
index 0000000000..72838ff56b
--- /dev/null
+++ b/activerecord/test/cases/connection_adapters/adapter_leasing_test.rb
@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+require "cases/helper"
+
+module ActiveRecord
+  module ConnectionAdapters
+    class AdapterLeasingTest < ActiveRecord::TestCase
+      class Pool < ConnectionPool
+        def insert_connection_for_test!(c)
+          synchronize do
+            adopt_connection(c)
+            @available.add c
+          end
+        end
+      end
+
+      def setup
+        @adapter = AbstractAdapter.new nil, nil
+      end
+
+      def test_in_use?
+        assert_not @adapter.in_use?, "adapter is not in use"
+        assert @adapter.lease, "lease adapter"
+        assert @adapter.in_use?, "adapter is in use"
+      end
+
+      def test_lease_twice
+        assert @adapter.lease, "should lease adapter"
+        assert_raises(ActiveRecordError) do
+          @adapter.lease
+        end
+      end
+
+      def test_expire_mutates_in_use
+        assert @adapter.lease, "lease adapter"
+        assert @adapter.in_use?, "adapter is in use"
+        @adapter.expire
+        assert_not @adapter.in_use?, "adapter is in use"
+      end
+
+      def test_close
+        pool = Pool.new(ConnectionSpecification.new("primary", {}, nil))
+        pool.insert_connection_for_test! @adapter
+        @adapter.pool = pool
+
+        # Make sure the pool marks the connection in use
+        assert_equal @adapter, pool.connection
+        assert_predicate @adapter, :in_use?
+
+        # Close should put the adapter back in the pool
+        @adapter.close
+        assert_not_predicate @adapter, :in_use?
+
+        assert_equal @adapter, pool.connection
+      end
+    end
+  end
+end