1 files changed, 42 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/rassoc_spec.rb b/spec/ruby/core/hash/rassoc_spec.rb
new file mode 100644
index 0000000000..79c633f95e
--- /dev/null
+++ b/spec/ruby/core/hash/rassoc_spec.rb
@@ -0,0 +1,42 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Hash#rassoc" do
+  before :each do
+    @h = {apple: :green, orange: :orange, grape: :green, banana: :yellow}
+  end
+
+  it "returns an Array if the argument is a value of the Hash" do
+    @h.rassoc(:green).should be_an_instance_of(Array)
+  end
+
+  it "returns a 2-element Array if the argument is a value of the Hash" do
+    @h.rassoc(:orange).size.should == 2
+  end
+
+  it "sets the first element of the Array to the key of the located value" do
+    @h.rassoc(:yellow).first.should == :banana
+  end
+
+  it "sets the last element of the Array to the located value" do
+    @h.rassoc(:yellow).last.should == :yellow
+  end
+
+  it "only returns the first matching key-value pair" do
+    @h.rassoc(:green).should == [:apple, :green]
+  end
+
+  it "uses #== to compare the argument to the values" do
+    @h[:key] = 1.0
+    1.should == 1.0
+    @h.rassoc(1).should eql [:key, 1.0]
+  end
+
+  it "returns nil if the argument is not a value of the Hash" do
+    @h.rassoc(:banana).should be_nil
+  end
+
+  it "returns nil if the argument is not a value of the Hash even when there is a default" do
+    Hash.new(42).merge!( foo: :bar ).rassoc(42).should be_nil
+    Hash.new{|h, k| h[k] = 42}.merge!( foo: :bar ).rassoc(42).should be_nil
+  end
+end