Added ignore module option to coverage report (#10317)

Author: danicuki

lib/mix/lib/mix/tasks/test.coverage.ex

@@ -169,7 +169,8 @@ defmodule Mix.Tasks.Test.Coverage do
 
   defp generate_cover_results(opts) do
     {:result, ok, _fail} = :cover.analyse(:coverage, :line)
-    modules = :cover.modules()
+    ignore = opts[:ignore_modules] || []
+    modules = Enum.reject(:cover.modules(), &(&1 in ignore))
 
     if summary_opts = Keyword.get(opts, :summary, true) do
       summary(ok, modules, summary_opts)

lib/mix/test/fixtures/umbrella_test/apps/bar/mix.exs

@@ -7,7 +7,8 @@ defmodule Bar.MixProject do
       version: "0.1.0",
       # Choose something besides *_test.exs so that these test files don't
       # get accidentally swept up into the actual Mix test suite.
-      test_pattern: "*_tests.exs"
+      test_pattern: "*_tests.exs",
+      test_coverage: [ignore_modules: [Bar]]
     ]
   end
 end

lib/mix/test/mix/tasks/test_test.exs

@@ -139,7 +139,6 @@ defmodule Mix.Tasks.TestTest do
 
                Percentage | Module
                -----------|--------------------------
-                  100.00% | Bar
                   100.00% | Bar.Protocol
                   100.00% | Bar.Protocol.BitString
                -----------|--------------------------