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require_relative '../../spec_helper'
describe "Exception#cause" do
it "returns the active exception when an exception is raised" do
begin
raise Exception, "the cause"
rescue Exception
begin
raise RuntimeError, "the consequence"
rescue RuntimeError => e
e.should be_an_instance_of(RuntimeError)
e.message.should == "the consequence"
e.cause.should be_an_instance_of(Exception)
e.cause.message.should == "the cause"
end
end
end
it "is set for user errors caused by internal errors" do
-> {
begin
1 / 0
rescue
raise "foo"
end
}.should raise_error(RuntimeError) { |e|
e.cause.should be_kind_of(ZeroDivisionError)
}
end
it "is set for internal errors caused by user errors" do
cause = RuntimeError.new "cause"
-> {
begin
raise cause
rescue
1 / 0
end
}.should raise_error(ZeroDivisionError) { |e|
e.cause.should equal(cause)
}
end
it "is not set to the exception itself when it is re-raised" do
-> {
begin
raise RuntimeError
rescue RuntimeError => e
raise e
end
}.should raise_error(RuntimeError) { |e|
e.cause.should == nil
}
end
end
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