1 files changed, 43 insertions, 0 deletions
diff --git a/activerecord/test/cases/arel/nodes/extract_test.rb b/activerecord/test/cases/arel/nodes/extract_test.rb
new file mode 100644
index 0000000000..8fc1e04d67
--- /dev/null
+++ b/activerecord/test/cases/arel/nodes/extract_test.rb
@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require_relative "../helper"
+
+class Arel::Nodes::ExtractTest < Arel::Spec
+  it "should extract field" do
+    table = Arel::Table.new :users
+    table[:timestamp].extract("date").to_sql.must_be_like %{
+      EXTRACT(DATE FROM "users"."timestamp")
+    }
+  end
+
+  describe "as" do
+    it "should alias the extract" do
+      table = Arel::Table.new :users
+      table[:timestamp].extract("date").as("foo").to_sql.must_be_like %{
+        EXTRACT(DATE FROM "users"."timestamp") AS foo
+      }
+    end
+
+    it "should not mutate the extract" do
+      table = Arel::Table.new :users
+      extract = table[:timestamp].extract("date")
+      before = extract.dup
+      extract.as("foo")
+      assert_equal extract, before
+    end
+  end
+
+  describe "equality" do
+    it "is equal with equal ivars" do
+      table = Arel::Table.new :users
+      array = [table[:attr].extract("foo"), table[:attr].extract("foo")]
+      assert_equal 1, array.uniq.size
+    end
+
+    it "is not equal with different ivars" do
+      table = Arel::Table.new :users
+      array = [table[:attr].extract("foo"), table[:attr].extract("bar")]
+      assert_equal 2, array.uniq.size
+    end
+  end
+end