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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require 'matrix'
ruby_version_is "1.9" do
describe "Matrix.build" do
it "returns a Matrix object of the given size" do
m = Matrix.build(3, 4){1}
m.should be_an_instance_of(Matrix)
m.row_size.should == 3
m.column_size.should == 4
end
it "builds the Matrix using the given block" do
Matrix.build(2, 3){|col, row| 10*col - row}.should ==
Matrix[[0, -1, -2], [10, 9, 8]]
end
it "iterates through the first row, then the second, ..." do
acc = []
Matrix.build(2, 3){|*args| acc << args}
acc.should == [[0, 0], [0, 1], [0, 2], [1, 0], [1, 1], [1, 2]]
end
it "returns an Enumerator is no block is given" do
enum = Matrix.build(2, 1)
enum.should be_an_instance_of(enumerator_class)
enum.each{1}.should == Matrix[[1], [1]]
end
it "requires integers as parameters" do
lambda { Matrix.build("1", "2"){1} }.should raise_error(TypeError)
lambda { Matrix.build(nil, nil){1} }.should raise_error(TypeError)
lambda { Matrix.build(1..2){1} }.should raise_error(TypeError)
end
it "requires non-negative integers" do
lambda { Matrix.build(-1, 1){1} }.should raise_error(ArgumentError)
lambda { Matrix.build(+1,-1){1} }.should raise_error(ArgumentError)
end
it "returns empty Matrix if one argument is zero" do
m = Matrix.build(0, 3){
raise "Should not yield"
}
m.should be_empty
m.column_size.should == 3
m = Matrix.build(3, 0){
raise "Should not yield"
}
m.should be_empty
m.row_size.should == 3
end
it "tries to calls :to_int on arguments" do
int = mock('int')
int.should_receive(:to_int).twice.and_return(2)
Matrix.build(int, int){ 1 }.should == Matrix[ [1,1], [1,1] ]
end
it "builds an nxn Matrix when given only one argument" do
m = Matrix.build(3){1}
m.row_size.should == 3
m.column_size.should == 3
end
end
describe "for a subclass of Matrix" do
it "returns an instance of that subclass" do
MatrixSub.build(3){1}.should be_an_instance_of(MatrixSub)
end
end
end
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