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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require 'matrix'
describe "Matrix#empty?" do
it "returns true when the Matrix is empty" do
Matrix[ ].empty?.should be_true
Matrix[ [], [], [] ].empty?.should be_true
Matrix[ [], [], [] ].transpose.empty?.should be_true
end
it "returns false when the Matrix has elements" do
Matrix[ [1, 2] ].empty?.should be_false
Matrix[ [1], [2] ].empty?.should be_false
end
it "doesn't accept any parameter" do
->{
Matrix[ [1, 2] ].empty?(42)
}.should raise_error(ArgumentError)
end
end
describe "Matrix.empty" do
it "returns an empty matrix of the requested size" do
m = Matrix.empty(3, 0)
m.row_size.should == 3
m.column_size.should == 0
m = Matrix.empty(0, 3)
m.row_size.should == 0
m.column_size.should == 3
end
it "has arguments defaulting to 0" do
Matrix.empty.should == Matrix.empty(0, 0)
Matrix.empty(42).should == Matrix.empty(42, 0)
end
it "does not accept more than two parameters" do
->{
Matrix.empty(1, 2, 3)
}.should raise_error(ArgumentError)
end
it "raises an error if both dimensions are > 0" do
->{
Matrix.empty(1, 2)
}.should raise_error(ArgumentError)
end
it "raises an error if any dimension is < 0" do
->{
Matrix.empty(-2, 0)
}.should raise_error(ArgumentError)
->{
Matrix.empty(0, -2)
}.should raise_error(ArgumentError)
end
end
describe "for a subclass of Matrix" do
it "returns an instance of that subclass" do
MatrixSub.empty(0, 1).should be_an_instance_of(MatrixSub)
end
end
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