introduce FileHelpers.absolute_path to reduce duplication in tests

sig/datadog/ci/worker.rbs

@@ -1,8 +1,8 @@
 module Datadog
   module CI
     class Worker < Datadog::Core::Worker
-      include  Datadog::Core::Workers::Async::Thread::PrependedMethods
       include Datadog::Core::Workers::Async::Thread
+      include Datadog::Core::Workers::Async::Thread::PrependedMethods
 
       DEFAULT_SHUTDOWN_TIMEOUT: 60
 

spec/datadog/ci/contrib/minitest/instrumentation_spec.rb

@@ -504,9 +504,7 @@ def test_pass_other
           # expect that background thread is covered
           test_span = test_spans.find { |span| span.get_tag("test.name") == "test_pass_other" }
           cov_event = find_coverage_for_test(test_span)
-          expect(cov_event.coverage.keys).to include(
-            File.expand_path(File.join(__dir__, "helpers/addition_helper.rb"))
-          )
+          expect(cov_event.coverage.keys).to include(absolute_path("helpers/addition_helper.rb"))
         end
 
         context "when ITR skips tests" do
@@ -935,7 +933,7 @@ def test_with_background_thread
       # expect that background thread is not covered
       cov_event = find_coverage_for_test(first_test_span)
       expect(cov_event.coverage.keys).not_to include(
-        File.expand_path(File.join(__dir__, "helpers/addition_helper.rb"))
+        absolute_path("helpers/addition_helper.rb")
       )
     end
   end

spec/datadog/ci/itr/coverage/event_spec.rb

@@ -86,7 +86,7 @@
     context "when file paths are absolute" do
       let(:coverage) do
         {
-          File.expand_path(File.join(__dir__, "./project/file.rb")) => true
+          absolute_path("./project/file.rb") => true
         }
       end
 

spec/ddcov/ddcov_spec.rb

@@ -6,10 +6,6 @@
 require_relative "calculator/code_with_❤️"
 
 RSpec.describe Datadog::CI::ITR::Coverage::DDCov do
-  def absolute_path(path)
-    File.expand_path(File.join(__dir__, path))
-  end
-
   let(:ignored_path) { nil }
   let(:threading_mode) { :multi }
   subject { described_class.new(root: root, ignored_path: ignored_path, threading_mode: threading_mode) }

spec/ddcov/ddcov_with_symlinks_spec.rb

@@ -5,10 +5,6 @@
 require "datadog_cov.#{RUBY_VERSION}_#{RUBY_PLATFORM}"
 
 RSpec.describe Datadog::CI::ITR::Coverage::DDCov do
-  def absolute_path(path)
-    File.expand_path(File.join(__dir__, path))
-  end
-
   before do
     # create a symlink to the calculator_with_symlinks/operations folder in vendor/gems
     FileUtils.ln_s(

spec/spec_helper.rb

@@ -14,6 +14,7 @@
 require_relative "support/span_helpers"
 require_relative "support/platform_helpers"
 require_relative "support/synchronization_helpers"
+require_relative "support/file_helpers"
 
 # shared contexts
 require_relative "support/contexts/ci_mode"
@@ -63,6 +64,7 @@ def self.load_plugins
   config.include TracerHelpers
   config.include SpanHelpers
   config.include SynchronizationHelpers
+  config.include FileHelpers
 
   # Enable flags like --only-failures and --next-failure
   config.example_status_persistence_file_path = ".rspec_status"

spec/support/file_helpers.rb

@@ -0,0 +1,11 @@
+require "datadog/ci"
+
+module FileHelpers
+  # this helper returns the absolute path of a file when given
+  # path relative to the current __dir__
+  def absolute_path(path)
+    callstack_top = caller_locations(1, 1)[0]
+    caller_dir = File.dirname(callstack_top.absolute_path)
+    File.join(caller_dir, path)
+  end
+end