1 files changed, 46 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerable/to_h_spec.rb b/spec/ruby/core/enumerable/to_h_spec.rb
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+++ b/spec/ruby/core/enumerable/to_h_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Enumerable#to_h" do
+  it "converts empty enumerable to empty hash" do
+    enum = EnumerableSpecs::EachDefiner.new
+    enum.to_h.should == {}
+  end
+
+  it "converts yielded [key, value] pairs to a hash" do
+    enum = EnumerableSpecs::EachDefiner.new([:a, 1], [:b, 2])
+    enum.to_h.should == { a: 1, b: 2 }
+  end
+
+  it "uses the last value of a duplicated key" do
+    enum = EnumerableSpecs::EachDefiner.new([:a, 1], [:b, 2], [:a, 3])
+    enum.to_h.should == { a: 3, b: 2 }
+  end
+
+  it "calls #to_ary on contents" do
+    pair = mock('to_ary')
+    pair.should_receive(:to_ary).and_return([:b, 2])
+    enum = EnumerableSpecs::EachDefiner.new([:a, 1], pair)
+    enum.to_h.should == { a: 1, b: 2 }
+  end
+
+  it "forwards arguments to #each" do
+    enum = Object.new
+    def enum.each(*args)
+      yield(*args)
+      yield([:b, 2])
+    end
+    enum.extend Enumerable
+    enum.to_h(:a, 1).should == { a: 1, b: 2 }
+  end
+
+  it "raises TypeError if an element is not an array" do
+    enum = EnumerableSpecs::EachDefiner.new(:x)
+    lambda { enum.to_h }.should raise_error(TypeError)
+  end
+
+  it "raises ArgumentError if an element is not a [key, value] pair" do
+    enum = EnumerableSpecs::EachDefiner.new([:x])
+    lambda { enum.to_h }.should raise_error(ArgumentError)
+  end
+end