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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/common', __FILE__)
describe "Exception#backtrace" do
before :each do
@backtrace = ExceptionSpecs::Backtrace.backtrace
end
it "returns nil if no backtrace was set" do
Exception.new.backtrace.should be_nil
end
it "returns an Array" do
@backtrace.should be_an_instance_of(Array)
end
it "sets each element to a String" do
@backtrace.each {|l| l.should be_an_instance_of(String)}
end
it "includes the filename of the location where self raised in the first element" do
@backtrace.first.should =~ /common\.rb/
end
it "includes the line number of the location where self raised in the first element" do
@backtrace.first.should =~ /:7:in /
end
it "includes the name of the method from where self raised in the first element" do
@backtrace.first.should =~ /in `backtrace'/
end
it "includes the filename of the location immediately prior to where self raised in the second element" do
@backtrace[1].should =~ /backtrace_spec\.rb/
end
it "includes the line number of the location immediately prior to where self raised in the second element" do
@backtrace[1].should =~ /:6(:in )?/
end
it "contains lines of the same format for each prior position in the stack" do
@backtrace[2..-1].each do |line|
# This regexp is deliberately imprecise to account for the need to abstract out
# the paths of the included mspec files and the desire to avoid specifying in any
# detail what the in `...' portion looks like.
line.should =~ /^[^ ]+\:\d+(:in `[^`]+')?$/
end
end
it "produces a backtrace for an exception captured using $!" do
exception = begin
raise
rescue RuntimeError
$!
end
exception.backtrace.first.should =~ /backtrace_spec/
end
it "returns an Array that can be updated" do
begin
raise
rescue RuntimeError => e
e.backtrace.unshift "backtrace first"
e.backtrace[0].should == "backtrace first"
end
end
end
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