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102 lines
3 KiB
Ruby
102 lines
3 KiB
Ruby
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require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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require_relative '../proc/shared/compose'
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ruby_version_is "2.6" do
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describe "Method#<<" do
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it "returns a Proc that is the composition of self and the passed Proc" do
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succ = MethodSpecs::Composition.new.method(:succ)
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upcase = proc { |s| s.upcase }
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(succ << upcase).call('Ruby').should == "RUBZ"
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end
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it "calls passed Proc with arguments and then calls self with result" do
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pow_2_proc = proc { |x| x * x }
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double_proc = proc { |x| x + x }
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pow_2_method = MethodSpecs::Composition.new.method(:pow_2)
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double_method = MethodSpecs::Composition.new.method(:double)
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(pow_2_method << double_proc).call(2).should == 16
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(double_method << pow_2_proc).call(2).should == 8
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end
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it "accepts any callable object" do
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inc = MethodSpecs::Composition.new.method(:inc)
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double = Object.new
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def double.call(n); n * 2; end
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(inc << double).call(3).should == 7
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end
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it_behaves_like :proc_compose, :<<, -> { MethodSpecs::Composition.new.method(:upcase) }
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describe "composition" do
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it "is a lambda" do
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pow_2 = MethodSpecs::Composition.new.method(:pow_2)
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double = proc { |x| x + x }
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(pow_2 << double).is_a?(Proc).should == true
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(pow_2 << double).lambda?.should == true
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end
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it "may accept multiple arguments" do
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inc = MethodSpecs::Composition.new.method(:inc)
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mul = proc { |n, m| n * m }
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(inc << mul).call(2, 3).should == 7
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end
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end
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end
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describe "Method#>>" do
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it "returns a Proc that is the composition of self and the passed Proc" do
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upcase = proc { |s| s.upcase }
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succ = MethodSpecs::Composition.new.method(:succ)
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(succ >> upcase).call('Ruby').should == "RUBZ"
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end
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it "calls passed Proc with arguments and then calls self with result" do
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pow_2_proc = proc { |x| x * x }
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double_proc = proc { |x| x + x }
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pow_2_method = MethodSpecs::Composition.new.method(:pow_2)
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double_method = MethodSpecs::Composition.new.method(:double)
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(pow_2_method >> double_proc).call(2).should == 8
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(double_method >> pow_2_proc).call(2).should == 16
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end
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it "accepts any callable object" do
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inc = MethodSpecs::Composition.new.method(:inc)
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double = Object.new
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def double.call(n); n * 2; end
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(inc >> double).call(3).should == 8
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end
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it_behaves_like :proc_compose, :>>, -> { MethodSpecs::Composition.new.method(:upcase) }
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describe "composition" do
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it "is a lambda" do
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pow_2 = MethodSpecs::Composition.new.method(:pow_2)
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double = proc { |x| x + x }
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(pow_2 >> double).is_a?(Proc).should == true
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(pow_2 >> double).lambda?.should == true
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end
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it "may accept multiple arguments" do
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mul = MethodSpecs::Composition.new.method(:mul)
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inc = proc { |n| n + 1 }
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(mul >> inc).call(2, 3).should == 7
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end
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end
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end
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end
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