1 files changed, 70 insertions, 0 deletions
diff --git a/spec/ruby/core/complex/coerce_spec.rb b/spec/ruby/core/complex/coerce_spec.rb
new file mode 100644
index 0000000000..d4ea85a713
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+++ b/spec/ruby/core/complex/coerce_spec.rb
@@ -0,0 +1,70 @@
+require_relative '../../spec_helper'
+
+describe "Complex#coerce" do
+  before :each do
+    @one = Complex(1)
+  end
+
+  it "returns an array containing other and self as Complex when other is an Integer" do
+    result = @one.coerce(2)
+    result.should == [2, 1]
+    result.first.should.is_a?(Complex)
+    result.last.should.is_a?(Complex)
+  end
+
+  it "returns an array containing other and self as Complex when other is a Float" do
+    result = @one.coerce(20.5)
+    result.should == [20.5, 1]
+    result.first.should.is_a?(Complex)
+    result.last.should.is_a?(Complex)
+  end
+
+  it "returns an array containing other and self as Complex when other is a Bignum" do
+    result = @one.coerce(4294967296)
+    result.should == [4294967296, 1]
+    result.first.should.is_a?(Complex)
+    result.last.should.is_a?(Complex)
+  end
+
+  it "returns an array containing other and self as Complex when other is a Rational" do
+    result = @one.coerce(Rational(5,6))
+    result.should == [Rational(5,6), 1]
+    result.first.should.is_a?(Complex)
+    result.last.should.is_a?(Complex)
+  end
+
+  it "returns an array containing other and self when other is a Complex" do
+    other = Complex(2)
+    result = @one.coerce(other)
+    result.should == [other, @one]
+    result.first.should.equal?(other)
+    result.last.should.equal?(@one)
+  end
+
+  it "returns an array containing other as Complex and self when other is a Numeric which responds to #real? with true" do
+    other = mock_numeric('other')
+    other.should_receive(:real?).any_number_of_times.and_return(true)
+    result = @one.coerce(other)
+    result.should == [other, @one]
+    result.first.should.eql?(Complex(other))
+    result.last.should.equal?(@one)
+  end
+
+  it "raises TypeError when other is a Numeric which responds to #real? with false" do
+    other = mock_numeric('other')
+    other.should_receive(:real?).any_number_of_times.and_return(false)
+    -> { @one.coerce(other) }.should.raise(TypeError)
+  end
+
+  it "raises a TypeError when other is a String" do
+    -> { @one.coerce("20") }.should.raise(TypeError)
+  end
+
+  it "raises a TypeError when other is nil" do
+    -> { @one.coerce(nil) }.should.raise(TypeError)
+  end
+
+  it "raises a TypeError when other is false" do
+    -> { @one.coerce(false) }.should.raise(TypeError)
+  end
+end