1 files changed, 20 insertions, 0 deletions
diff --git a/spec/ruby/library/matrix/shared/imaginary.rb b/spec/ruby/library/matrix/shared/imaginary.rb
new file mode 100644
index 0000000000..61a65a62ec
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+++ b/spec/ruby/library/matrix/shared/imaginary.rb
@@ -0,0 +1,20 @@
+require File.expand_path('../../fixtures/classes', __FILE__)
+require 'matrix'
+
+describe :matrix_imaginary, shared: true do
+  it "returns a matrix with the imaginary part of the elements of the receiver" do
+    Matrix[ [1,   2], [3, 4] ].send(@method).should == Matrix[ [0,   0], [0, 0] ]
+    Matrix[ [1.9, Complex(1,1)], [Complex(-2,0.42), 4] ].send(@method).should == Matrix[ [0, 1], [0.42, 0] ]
+  end
+
+  it "returns empty matrices on the same size if empty" do
+    Matrix.empty(0, 3).send(@method).should == Matrix.empty(0, 3)
+    Matrix.empty(3, 0).send(@method).should == Matrix.empty(3, 0)
+  end
+
+  describe "for a subclass of Matrix" do
+    it "returns an instance of that subclass" do
+      MatrixSub.ins.send(@method).should be_an_instance_of(MatrixSub)
+    end
+  end
+end