1 files changed, 52 insertions, 0 deletions
diff --git a/spec/ruby/core/array/rassoc_spec.rb b/spec/ruby/core/array/rassoc_spec.rb
new file mode 100644
index 0000000000..632a05e8b3
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+++ b/spec/ruby/core/array/rassoc_spec.rb
@@ -0,0 +1,52 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Array#rassoc" do
+  it "returns the first contained array whose second element is == object" do
+    ary = [[1, "a", 0.5], [2, "b"], [3, "b"], [4, "c"], [], [5], [6, "d"]]
+    ary.rassoc("a").should == [1, "a", 0.5]
+    ary.rassoc("b").should == [2, "b"]
+    ary.rassoc("d").should == [6, "d"]
+    ary.rassoc("z").should == nil
+  end
+
+  it "properly handles recursive arrays" do
+    empty = ArraySpecs.empty_recursive_array
+    empty.rassoc([]).should be_nil
+    [[empty, empty]].rassoc(empty).should == [empty, empty]
+
+    array = ArraySpecs.recursive_array
+    array.rassoc(array).should be_nil
+    [[empty, array]].rassoc(array).should == [empty, array]
+  end
+
+  it "calls elem == obj on the second element of each contained array" do
+    key = 'foobar'
+    o = mock('foobar')
+    def o.==(other); other == 'foobar'; end
+
+    [[1, :foobar], [2, o], [3, mock('foo')]].rassoc(key).should == [2, o]
+  end
+
+  it "does not check the last element in each contained but specifically the second" do
+    key = 'foobar'
+    o = mock('foobar')
+    def o.==(other); other == 'foobar'; end
+
+    [[1, :foobar, o], [2, o, 1], [3, mock('foo')]].rassoc(key).should == [2, o, 1]
+  end
+
+  ruby_version_is "3.3" do
+    it "calls to_ary on non-array elements" do
+      s1 = [1, 2]
+      s2 = ArraySpecs::ArrayConvertible.new(2, 3)
+      a = [s1, s2]
+
+      s1.should_not_receive(:to_ary)
+      a.rassoc(2).should equal(s1)
+
+      a.rassoc(3).should == [2, 3]
+      s2.called.should equal(:to_ary)
+    end
+  end
+end