1 files changed, 41 insertions, 0 deletions
diff --git a/spec/knapsack_merger.rb b/spec/knapsack_merger.rb
new file mode 100644
index 00000000000..c6bcefe8464
--- /dev/null
+++ b/spec/knapsack_merger.rb
@@ -0,0 +1,41 @@
+begin
+  class Knapsack::Report
+    alias_method :save_without_leading_existing_report, :save
+
+    def load_existing_report
+      Knapsack::Presenter.existing_report = open
+    rescue
+      false
+    end
+
+    def save
+      load_existing_report
+      save_without_leading_existing_report
+    end
+  end
+
+  class << Knapsack::Presenter
+    attr_accessor :existing_report
+
+    def initialize
+      @existing_report = []
+    end
+
+    def report_hash
+      return current_report_hash unless existing_report
+      existing_report.merge(current_report_hash).sort.to_h
+    end
+
+    def current_report_hash
+      Knapsack.tracker.test_files_with_time
+    end
+
+    def report_yml
+      report_hash.to_yaml
+    end
+
+    def report_json
+      JSON.pretty_generate(report_hash)
+    end
+  end
+end