1 files changed, 44 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/lt_spec.rb b/spec/ruby/core/hash/lt_spec.rb
new file mode 100644
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+++ b/spec/ruby/core/hash/lt_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../shared/comparison', __FILE__)
+require File.expand_path('../shared/less_than', __FILE__)
+
+ruby_version_is "2.3" do
+  describe "Hash#<" do
+    it_behaves_like :hash_comparison, :<
+    it_behaves_like :hash_less_than, :<
+
+    it "returns false if both hashes are identical" do
+      h = { a: 1, b: 2 }
+      (h < h).should be_false
+    end
+  end
+
+  describe "Hash#<" do
+    before :each do
+      @hash = {a:1, b:2}
+      @bigger = {a:1, b:2, c:3}
+      @unrelated = {c:3, d:4}
+      @similar = {a:2, b:3}
+    end
+
+    it "returns false when receiver size is larger than argument" do
+      (@bigger < @hash).should == false
+      (@bigger < @unrelated).should == false
+    end
+
+    it "returns false when receiver size is the same as argument" do
+      (@hash < @hash).should == false
+      (@hash < @unrelated).should == false
+      (@unrelated < @hash).should == false
+    end
+
+    it "returns true when receiver is a subset of argument" do
+      (@hash < @bigger).should == true
+    end
+
+    it "returns false when keys match but values don't" do
+      (@hash < @similar).should == false
+      (@similar < @hash).should == false
+    end
+  end
+end