1 files changed, 47 insertions, 0 deletions
diff --git a/lib/gitlab/ci/reports/coverage_report.rb b/lib/gitlab/ci/reports/coverage_report.rb
new file mode 100644
index 00000000000..cebbb9ae842
--- /dev/null
+++ b/lib/gitlab/ci/reports/coverage_report.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Ci
+    module Reports
+      class CoverageReport
+        attr_reader :files
+
+        def initialize
+          @files = {}
+        end
+
+        def empty?
+          @files.empty?
+        end
+
+        def pick(keys)
+          coverage_files = files.select do |key|
+            keys.include?(key)
+          end
+
+          { files: coverage_files }
+        end
+
+        def add_file(name, line_coverage)
+          if files[name].present?
+            line_coverage.each { |line, hits| combine_lines(name, line, hits) }
+
+          else
+            files[name] = line_coverage
+          end
+        end
+
+        private
+
+        def combine_lines(name, line, hits)
+          if files[name][line].present?
+            files[name][line] += hits
+
+          else
+            files[name][line] = hits
+          end
+        end
+      end
+    end
+  end
+end