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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require 'matrix'
describe "Matrix.[]" do
it "requires arrays as parameters" do
lambda { Matrix[5] }.should raise_error(TypeError)
lambda { Matrix[nil] }.should raise_error(TypeError)
lambda { Matrix[1..2] }.should raise_error(TypeError)
lambda { Matrix[[1, 2], 3] }.should raise_error(TypeError)
end
it "creates an empty Matrix with no arguments" do
m = Matrix[]
m.column_size.should == 0
m.row_size.should == 0
end
it "raises for non-rectangular matrices" do
lambda{ Matrix[ [0], [0,1] ] }.should \
raise_error(Matrix::ErrDimensionMismatch)
lambda{ Matrix[ [0,1], [0,1,2], [0,1] ]}.should \
raise_error(Matrix::ErrDimensionMismatch)
end
it "accepts vector arguments" do
a = Matrix[Vector[1, 2], Vector[3, 4]]
a.should be_an_instance_of(Matrix)
a.should == Matrix[ [1, 2], [3, 4] ]
end
it "tries to calls :to_ary on arguments" do
array = mock('ary')
array.should_receive(:to_ary).and_return([1,2])
Matrix[array, [3,4] ].should == Matrix[ [1,2], [3,4] ]
end
it "returns a Matrix object" do
Matrix[ [1] ].should be_an_instance_of(Matrix)
end
it "can create an nxn Matrix" do
m = Matrix[ [20,30], [40.5, 9] ]
m.row_size.should == 2
m.column_size.should == 2
m.column(0).should == Vector[20, 40.5]
m.column(1).should == Vector[30, 9]
m.row(0).should == Vector[20, 30]
m.row(1).should == Vector[40.5, 9]
end
it "can create a 0xn Matrix" do
m = Matrix[ [], [], [] ]
m.row_size.should == 3
m.column_size.should == 0
end
describe "for a subclass of Matrix" do
it "returns an instance of that subclass" do
MatrixSub[ [20,30], [40.5, 9] ].should be_an_instance_of(MatrixSub)
end
end
end
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