1 files changed, 50 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/try_convert_spec.rb b/spec/ruby/core/hash/try_convert_spec.rb
new file mode 100644
index 0000000000..c321183356
--- /dev/null
+++ b/spec/ruby/core/hash/try_convert_spec.rb
@@ -0,0 +1,50 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Hash.try_convert" do
+  it "returns the argument if it's a Hash" do
+    x = Hash.new
+    Hash.try_convert(x).should.equal?(x)
+  end
+
+  it "returns the argument if it's a kind of Hash" do
+    x = HashSpecs::MyHash.new
+    Hash.try_convert(x).should.equal?(x)
+  end
+
+  it "returns nil when the argument does not respond to #to_hash" do
+    Hash.try_convert(Object.new).should == nil
+  end
+
+  it "sends #to_hash to the argument and returns the result if it's nil" do
+    obj = mock("to_hash")
+    obj.should_receive(:to_hash).and_return(nil)
+    Hash.try_convert(obj).should == nil
+  end
+
+  it "sends #to_hash to the argument and returns the result if it's a Hash" do
+    x = Hash.new
+    obj = mock("to_hash")
+    obj.should_receive(:to_hash).and_return(x)
+    Hash.try_convert(obj).should.equal?(x)
+  end
+
+  it "sends #to_hash to the argument and returns the result if it's a kind of Hash" do
+    x = HashSpecs::MyHash.new
+    obj = mock("to_hash")
+    obj.should_receive(:to_hash).and_return(x)
+    Hash.try_convert(obj).should.equal?(x)
+  end
+
+  it "sends #to_hash to the argument and raises TypeError if it's not a kind of Hash" do
+    obj = mock("to_hash")
+    obj.should_receive(:to_hash).and_return(Object.new)
+    -> { Hash.try_convert obj }.should raise_consistent_error(TypeError, "can't convert MockObject into Hash (MockObject#to_hash gives Object)")
+  end
+
+  it "does not rescue exceptions raised by #to_hash" do
+    obj = mock("to_hash")
+    obj.should_receive(:to_hash).and_raise(RuntimeError)
+    -> { Hash.try_convert obj }.should.raise(RuntimeError)
+  end
+end