Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 42 insertions, 0 deletions

diff --git a/spec/rubyspec/library/matrix/minus_spec.rb b/spec/rubyspec/library/matrix/minus_spec.rb
new file mode 100644
index 0000000000..fe2d716882
--- /dev/null
+++ b/spec/rubyspec/library/matrix/minus_spec.rb
@@ -0,0 +1,42 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require 'matrix'
+
+describe "Matrix#-" do
+  before :each do
+    @a = Matrix[ [1, 2], [3, 4] ]
+    @b = Matrix[ [4, 5], [6, 7] ]
+  end
+
+  it "returns the result of subtracting the corresponding elements of other from self" do
+    (@a - @b).should == Matrix[ [-3,-3], [-3,-3] ]
+  end
+
+  it "returns an instance of Matrix" do
+    (@a - @b).should be_kind_of(Matrix)
+  end
+
+  it "raises a Matrix::ErrDimensionMismatch if the matrices are different sizes" do
+    lambda { @a - Matrix[ [1] ] }.should raise_error(Matrix::ErrDimensionMismatch)
+  end
+
+  it "raises a ExceptionForMatrix::ErrOperationNotDefined if other is a Numeric Type" do
+    lambda { @a - 2            }.should raise_error(Matrix::ErrOperationNotDefined)
+    lambda { @a - 1.2          }.should raise_error(Matrix::ErrOperationNotDefined)
+    lambda { @a - bignum_value }.should raise_error(Matrix::ErrOperationNotDefined)
+  end
+
+  it "raises a TypeError if other is of wrong type" do
+    lambda { @a - nil        }.should raise_error(TypeError)
+    lambda { @a - "a"        }.should raise_error(TypeError)
+    lambda { @a - [ [1, 2] ] }.should raise_error(TypeError)
+    lambda { @a - Object.new }.should raise_error(TypeError)
+  end
+
+  describe "for a subclass of Matrix" do
+    it "returns an instance of that subclass" do
+      m = MatrixSub.ins
+      (m-m).should be_an_instance_of(MatrixSub)
+    end
+  end
+end