From e1d3fb73012b5af3c5ec81f4577b4d9d1fe1927c Mon Sep 17 00:00:00 2001
From: Will Daly <will.e.daly@gmail.com>
Date: Tue, 4 Jun 2013 18:46:45 -0400
Subject: [PATCH] Added warning message when no coverage information found.
 Added comments to tests.rake

---
 rakefiles/tests.rake | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/rakefiles/tests.rake b/rakefiles/tests.rake
index 528290cee5..904ea4a54e 100644
--- a/rakefiles/tests.rake
+++ b/rakefiles/tests.rake
@@ -129,17 +129,33 @@ end
 
 desc "Build the html, xml, and diff coverage reports"
 task :coverage => :report_dirs do
+
+    found_coverage_info = false
+
     TEST_TASK_DIRS.each do |dir|
         report_dir = report_dir_path(dir)
 
         if !File.file?("#{report_dir}/.coverage")
             next
+        else
+            found_coverage_info = true
         end
 
+        # Generate the coverage.py HTML report
         sh("coverage html --rcfile=#{dir}/.coveragerc")
+
+        # Generate the coverage.py XML report
         sh("coverage xml -o #{report_dir}/coverage.xml --rcfile=#{dir}/.coveragerc")
+
+        # Generate the diff coverage HTML report, based on the XML report
         sh("diff-cover #{report_dir}/coverage.xml --html-report #{report_dir}/diff_cover.html")
+
+        # Print the diff coverage report to the console
         sh("diff-cover #{report_dir}/coverage.xml")
-        puts "\n\n"
+        puts "\n"
+    end
+
+    if not found_coverage_info
+        puts "No coverage info found.  Run `rake test` before running `rake coverage`."
     end
 end