From 1f7abf7283030e66289e887a4d425e7637d4f9d8 Mon Sep 17 00:00:00 2001
From: mame <mame@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 14 Sep 2017 04:32:58 +0000
Subject: Add branch coverage for case-when statement

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59885 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/coverage/test_coverage.rb | 54 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

(limited to 'test/coverage/test_coverage.rb')

diff --git a/test/coverage/test_coverage.rb b/test/coverage/test_coverage.rb
index 3b3c9c3413..87b7126aa9 100644
--- a/test/coverage/test_coverage.rb
+++ b/test/coverage/test_coverage.rb
@@ -226,4 +226,58 @@ class TestCoverage < Test::Unit::TestCase
       }
     }
   end
+
+  def test_branch_coverage_for_case_statement
+    Dir.mktmpdir {|tmp|
+      Dir.chdir(tmp) {
+        File.open("test.rb", "w") do |f|
+          f.puts 'def foo(x)'
+          f.puts '  case x'
+          f.puts '  when 0'
+          f.puts '    0'
+          f.puts '  when 1'
+          f.puts '    1'
+          f.puts '  end'
+          f.puts ''
+          f.puts '  case'
+          f.puts '  when x == 0'
+          f.puts '    0'
+          f.puts '  when x == 1'
+          f.puts '    1'
+          f.puts '  end'
+          f.puts ''
+          f.puts '  case x'
+          f.puts '  when 0'
+          f.puts '    0'
+          f.puts '  when 1'
+          f.puts '    1'
+          f.puts '  else'
+          f.puts '    :other'
+          f.puts '  end'
+          f.puts ''
+          f.puts '  case'
+          f.puts '  when x == 0'
+          f.puts '    0'
+          f.puts '  when x == 1'
+          f.puts '    1'
+          f.puts '  else'
+          f.puts '    :other'
+          f.puts '  end'
+          f.puts 'end'
+          f.puts ''
+          f.puts 'foo(0)'
+          f.puts 'foo(0)'
+          f.puts 'foo(2)'
+        end
+
+        assert_in_out_err(%w[-W0 -rcoverage], <<-"end;", ["{:branches=>{[:case, 0, 2]=>{[:when, 1, 4]=>2, [:when, 2, 6]=>0, [:else, 3, 2]=>1}, [:case, 4, 14]=>{[:when, 5, 11]=>2, [:when, 6, 13]=>0, [:else, 7, 14]=>1}, [:case, 8, 16]=>{[:when, 9, 18]=>2, [:when, 10, 20]=>0, [:else, 11, 22]=>1}, [:case, 12, 32]=>{[:when, 13, 27]=>2, [:when, 14, 29]=>0, [:else, 15, 31]=>1}}}"], [])
+          ENV["COVERAGE_EXPERIMENTAL_MODE"] = "true"
+          Coverage.start(branches: true)
+          tmp = Dir.pwd
+          require tmp + '/test.rb'
+          p Coverage.result[tmp + "/test.rb"]
+        end;
+      }
+    }
+  end
 end
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