Fix RSpec/FilePath detection across sibling directories.

CHANGELOG.md

@@ -7,6 +7,7 @@
 * Expand `Capybara/VisibilityMatcher` to support more than just `have_selector`. ([@twalpole][])
 * Add new `SpecSuffixOnly` option to `RSpec/FilePath` cop. ([@zdennis][])
 * Allow `RSpec/RepeatedExampleGroupBody` to differ only by described_class. ([@robotdana][])
+* Fix `RSpec/FilePath` detection across sibling directories. ([@rolfschmidt][])
 
 ## 1.39.0 (2020-05-01)
 
@@ -512,3 +513,4 @@ Compatibility release so users can upgrade RuboCop to 0.51.0. No new features.
 [@twalpole]: https://github.com/twalpole
 [@zdennis]: https://github.com/zdennis
 [@robotdana]: https://github.com/robotdana
+[@rolfschmidt]: https://github.com/rolfschmidt

lib/rubocop/cop/rspec/file_path.rb

@@ -126,6 +126,7 @@ def ignore_methods?
         def filename_ends_with?(glob)
           filename =
             RuboCop::PathUtil.relative_path(processed_source.buffer.name)
+              .gsub('../', '')
           File.fnmatch?("*#{glob}", filename)
         end
 

spec/rubocop/cop/rspec/file_path_spec.rb

@@ -179,6 +179,24 @@
     RUBY
   end
 
+  it 'uses relative path for sibling directory project' do
+    allow(RuboCop::PathUtil)
+      .to receive(:relative_path)
+      .and_return('../ext-project/spec/models/bar_spec.rb')
+    expect_no_offenses(<<-RUBY, '/home/ext-project/spec/models/bar_spec.rb')
+      describe Bar do; end
+    RUBY
+  end
+
+  it 'uses relative path for different path project' do
+    allow(RuboCop::PathUtil)
+      .to receive(:relative_path)
+      .and_return('../../opt/ext-project/spec/models/bar_spec.rb')
+    expect_no_offenses(<<-RUBY, '/opt/ext-project/spec/models/bar_spec.rb')
+      describe Bar do; end
+    RUBY
+  end
+
   context 'when configured with CustomTransform' do
     let(:cop_config) { { 'CustomTransform' => { 'FooFoo' => 'foofoo' } } }