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