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require_relative '../../spec_helper'
require_relative 'fixtures/caller'
describe 'Kernel#caller' do
it 'is a private method' do
Kernel.should have_private_instance_method(:caller)
end
it 'returns an Array of caller locations' do
KernelSpecs::CallerTest.locations.should_not.empty?
end
it 'returns an Array of caller locations using a custom offset' do
locations = KernelSpecs::CallerTest.locations(2)
locations[0].should =~ %r{runner/mspec.rb}
end
it 'returns an Array of caller locations using a custom limit' do
locations = KernelSpecs::CallerTest.locations(1, 1)
locations.length.should == 1
end
it 'returns an Array of caller locations using a range' do
locations = KernelSpecs::CallerTest.locations(1..1)
locations.length.should == 1
end
it 'returns the locations as String instances' do
locations = KernelSpecs::CallerTest.locations
line = __LINE__ - 1
locations[0].should include("#{__FILE__}:#{line}:in")
end
it "returns an Array with the block given to #at_exit at the base of the stack" do
path = fixture(__FILE__, "caller_at_exit.rb")
lines = ruby_exe(path).lines
lines.size.should == 2
lines[0].should =~ /\A#{path}:6:in [`'](?:Object#)?foo'\n\z/
lines[1].should =~ /\A#{path}:2:in [`']block in <main>'\n\z/
end
it "can be called with a range" do
locations1 = caller(0)
locations2 = caller(2..4)
locations1[2..4].should == locations2
end
it "works with endless ranges" do
locations1 = KernelSpecs::CallerTest.locations(0)
locations2 = KernelSpecs::CallerTest.locations(eval("(2..)"))
locations2.should == locations1[2..-1]
end
it "works with beginless ranges" do
locations1 = KernelSpecs::CallerTest.locations(0)
locations2 = KernelSpecs::CallerTest.locations((..5))
locations2[eval("(2..)")].should == locations1[(..5)][eval("(2..)")]
end
it "can be called with a range whose end is negative" do
locations1 = caller(0)
locations2 = caller(2..-1)
locations3 = caller(2..-2)
locations1[2..-1].should == locations2
locations1[2..-2].should == locations3
end
it "must return nil if omitting more locations than available" do
caller(100).should == nil
caller(100..-1).should == nil
end
it "must return [] if omitting exactly the number of locations available" do
omit = caller(0).length
caller(omit).should == []
end
it "must return the same locations when called with 1..-1 and when called with no arguments" do
caller.should == caller(1..-1)
end
guard -> { Kernel.instance_method(:tap).source_location } do
it "includes core library methods defined in Ruby" do
file, line = Kernel.instance_method(:tap).source_location
file.should.start_with?('<internal:')
loc = nil
tap { loc = caller(1, 1)[0] }
loc.should =~ /\A<internal:.*in [`'](?:Kernel#)?tap'\z/
end
end
end
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