1 files changed, 64 insertions, 0 deletions
diff --git a/spec/ruby/core/struct/hash_spec.rb b/spec/ruby/core/struct/hash_spec.rb
new file mode 100644
index 0000000000..53361eb7a9
--- /dev/null
+++ b/spec/ruby/core/struct/hash_spec.rb
@@ -0,0 +1,64 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/accessor'
+
+describe "Struct#hash" do
+
+  it "returns the same integer for structs with the same content" do
+    [StructClasses::Ruby.new("1.8.6", "PPC"),
+     StructClasses::Car.new("Hugo", "Foo", "1972")].each do |stc|
+      stc.hash.should == stc.dup.hash
+      stc.hash.should be_kind_of(Integer)
+    end
+  end
+
+  it "returns the same value if structs are #eql?" do
+    car = StructClasses::Car.new("Honda", "Accord", "1998")
+    similar_car = StructClasses::Car.new("Honda", "Accord", "1998")
+    car.should eql(similar_car)
+    car.hash.should == similar_car.hash
+  end
+
+  it "returns different hashes for structs with different values" do
+    s1 = StructClasses::Ruby.new('2.7.0', 'linux')
+    s2 = StructClasses::Ruby.new('2.7.0', 'macos')
+    s1.hash.should_not == s2.hash
+  end
+
+  it "returns different hashes for structs with different values when using keyword_init: true" do
+    key = :"1 non symbol member"
+    struct_class = Struct.new(key, keyword_init: true)
+    t1 = struct_class.new(key => 1)
+    t2 = struct_class.new(key => 2)
+    t1.hash.should_not == t2.hash
+  end
+
+  it "allows for overriding methods in an included module" do
+    mod = Module.new do
+      def hash
+        "different"
+      end
+    end
+    s = Struct.new(:arg) do
+      include mod
+    end
+    s.new.hash.should == "different"
+  end
+
+  it "returns the same hash for recursive structs" do
+    car = StructClasses::Car.new("Honda", "Accord", "1998")
+    similar_car = StructClasses::Car.new("Honda", "Accord", "1998")
+    car[:make] = car
+    similar_car[:make] = car
+    car.hash.should == similar_car.hash
+    # This is because car.eql?(similar_car).
+    # Objects that are eql? must return the same hash.
+    # See the Struct#eql? specs
+  end
+
+  it "returns different hashes for different struct classes" do
+    Struct.new(:x).new(1).hash.should != Struct.new(:y).new(1).hash
+  end
+
+  it_behaves_like :struct_accessor, :hash
+end