Diff from diffable custom matcher does not handle multiline string properly?

[jennek...@oce.com]

I need to match long multiline strings (strings with \n embedded) while ignoring whitespace and comments and more.

Writing a custom matcher for that was not much of a problem using the Matcher DSL.

However, the Diff output I get does not work for me.

Diff treats the expected string as one long line, not splitting it at \n, or so it seems.

I stripped my code to show the issue. Like this the custom matcher does not make much sense anymore, but it demonstrates the issue in a single spec file.

require 'rspec'

RSpec::Matchers.define :custom_match do |expected|

  match do |actual|

    actual == expected

  end

  diffable

end

describe 'the difference in output between #== and custom matcher using #==' do

  before(:all) do

    @str1 = "line1\nline2\n"

    @str2 = "LINE1\nline2\n"

  end

  # fail on purpose

  it 'presents a diff per line' do

    @str1.should == @str2

  end

  # OUTPUT:

  # expected: "LINE1\nline2\n"

  # got: "line1\nline2\n" (using ==)

  # Diff:

  #     @@ -1,3 +1,3 @@

  # -LINE1

  # +line1

  # line2

  # fail on purpose

  it 'presents a diff for the whole string' do

    @str1.should custom_match(@str2)

  end

  # OUTPUT:

  # expected "line1\nline2\n" to custom match "LINE1\nline2\n"

  # Diff:

  #     @@ -1,2 +1,3 @@

  # -LINE1\nline2\n

  # +line1

  # +line2

end

The Diff output in the first example is what I want.

The Diff output of the second example shows that the expected string is not split as expected..

I have no clue how to make Diff produce output like in the first example.

Suggestions much appreciated.

Thanks

-jennek

[Myron Marston]

You may have hit on a bug.  Can you report it to rspec-expectations?

https://github.com/rspec/rspec-expectations/issues 

[Spe@King... World]

Please, in the google support I can not find the rigtht settings in order to unsubscrive me from this group. Can you help me or, better, unsubscrive me from this e-mai messaging (it fills as-like spamming)?

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[jennek...@oce.com]

Done.