Generate Cobertura coverage data for Azure Pipelines

These can be used and displayed directly in the Azure Pipelines GUI.

It may not end up replacing CodeCov but it's easy enough so: why not.

Library/Homebrew/test/Gemfile

@@ -17,4 +17,5 @@ end
 group :coverage do
   gem "codecov", require: false
   gem "simplecov", require: false
+  gem "simplecov-cobertura", require: false
 end

Library/Homebrew/test/Gemfile.lock

@@ -59,6 +59,8 @@ GEM
       docile (~> 1.1)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
+    simplecov-cobertura (1.3.0)
+      simplecov (~> 0.8)
     simplecov-html (0.10.2)
     unicode-display_width (1.4.0)
     url (0.3.2)
@@ -77,6 +79,7 @@ DEPENDENCIES
   rubocop (= 0.59.1)
   rubocop-rspec
   simplecov
+  simplecov-cobertura
 
 BUNDLED WITH
    1.16.4

Library/Homebrew/test/spec_helper.rb

@@ -8,6 +8,11 @@ if ENV["HOMEBREW_TESTS_COVERAGE"]
     ENV["CODECOV_TOKEN"] = ENV["HOMEBREW_CODECOV_TOKEN"]
   end
 
+  if ENV["HOMEBREW_AZURE_PIPELINES"]
+    require "simplecov-cobertura"
+    formatters << SimpleCov::Formatter::CoberturaFormatter
+  end
+
   SimpleCov.formatters = SimpleCov::Formatter::MultiFormatter.new(formatters)
 end
 

azure-pipelines.yml

@@ -22,6 +22,14 @@ jobs:
         testRunner: JUnit
         testResultsFiles: brew-test-bot.xml
 
+    - task: PublishCodeCoverageResults@1
+      displayName: Publish brew tests code coverage
+      inputs:
+        codeCoverageTool: Cobertura
+        summaryFileLocation: $(Build.SourcesDirectory)/coverage/coverage.xml
+        reportDirectory: $(Build.SourcesDirectory)/coverage
+        failIfCoverageEmpty: true
+
 - job: Linux
   pool:
     vmImage: ubuntu-16.04
@@ -31,3 +39,10 @@ jobs:
       displayName: Run brew test-bot
       env:
         HOMEBREW_GITHUB_API_TOKEN: $(github.publicApiToken)
+
+    - task: PublishTestResults@2
+      displayName: Publish test-bot test results
+      condition: succeededOrFailed()
+      inputs:
+        testRunner: JUnit
+        testResultsFiles: brew-test-bot.xml