1 files changed, 143 insertions, 0 deletions
diff --git a/Library/Homebrew/test/test_compilers.rb b/Library/Homebrew/test/test_compilers.rb
new file mode 100644
index 000000000..7ad6f2df7
--- /dev/null
+++ b/Library/Homebrew/test/test_compilers.rb
@@ -0,0 +1,143 @@
+require 'testing_env'
+
+require 'extend/ARGV' # needs to be after test/unit to avoid conflict with OptionsParser
+ARGV.extend(HomebrewArgvExtension)
+
+require 'extend/ENV'
+ENV.extend(HomebrewEnvExtension)
+
+require 'test/testball'
+
+module CompilerTestsEnvExtension
+  def unset_use_cc
+    vars = %w{HOMEBREW_USE_CLANG HOMEBREW_USE_LLVM HOMEBREW_USE_GCC}
+    vars.each { |v| ENV.delete(v) }
+  end
+end
+ENV.extend(CompilerTestsEnvExtension)
+
+class CompilerTests < Test::Unit::TestCase
+  def test_llvm_failure
+    ENV.unset_use_cc
+    f = TestLLVMFailure.new
+    cs = CompilerSelector.new(f)
+
+    assert !(f.fails_with? :clang)
+    assert f.fails_with? :llvm
+    assert !(f.fails_with? :gcc)
+
+    cs.select_compiler
+
+    assert_equal case MacOS.clang_build_version
+      when 0..210 then :gcc
+      else :clang
+      end, ENV.compiler
+
+    ENV.send MacOS.default_compiler
+  end
+
+  def test_all_compiler_failures
+    ENV.unset_use_cc
+    f = TestAllCompilerFailures.new
+    cs = CompilerSelector.new(f)
+
+    assert f.fails_with? :clang
+    assert f.fails_with? :llvm
+    assert f.fails_with? :gcc
+
+    cs.select_compiler
+
+    assert_equal MacOS.default_compiler, ENV.compiler
+
+    ENV.send MacOS.default_compiler
+  end
+
+  def test_no_compiler_failures
+    ENV.unset_use_cc
+    f = TestNoCompilerFailures.new
+    cs = CompilerSelector.new(f)
+
+    assert !(f.fails_with? :clang)
+    assert !(f.fails_with? :llvm)
+    assert case MacOS.gcc_42_build_version
+      when 0 then f.fails_with? :gcc
+      else !(f.fails_with? :gcc)
+      end
+
+    cs.select_compiler
+
+    assert_equal MacOS.default_compiler, ENV.compiler
+
+    ENV.send MacOS.default_compiler
+  end
+
+  def test_mixed_compiler_failures
+    ENV.unset_use_cc
+    f = TestMixedCompilerFailures.new
+    cs = CompilerSelector.new(f)
+
+    assert f.fails_with? :clang
+    assert !(f.fails_with? :llvm)
+    assert f.fails_with? :gcc
+
+    cs.select_compiler
+
+    assert_equal :llvm, ENV.compiler
+
+    ENV.send MacOS.default_compiler
+  end
+
+  def test_more_mixed_compiler_failures
+    ENV.unset_use_cc
+    f = TestMoreMixedCompilerFailures.new
+    cs = CompilerSelector.new(f)
+
+    assert !(f.fails_with? :clang)
+    assert f.fails_with? :llvm
+    assert f.fails_with? :gcc
+
+    cs.select_compiler
+
+    assert_equal :clang, ENV.compiler
+
+    ENV.send MacOS.default_compiler
+  end
+
+  def test_even_more_mixed_compiler_failures
+    ENV.unset_use_cc
+    f = TestEvenMoreMixedCompilerFailures.new
+    cs = CompilerSelector.new(f)
+
+    assert f.fails_with? :clang
+    assert f.fails_with? :llvm
+    assert case MacOS.gcc_42_build_version
+      when 0 then f.fails_with? :gcc
+      else !(f.fails_with? :gcc)
+      end
+
+    cs.select_compiler
+
+    assert_equal case MacOS.clang_build_version
+      when 0..210 then :gcc
+      else :clang
+      end, ENV.compiler
+
+    ENV.send MacOS.default_compiler
+  end
+
+  def test_block_with_no_build_compiler_failures
+    ENV.unset_use_cc
+    f = TestBlockWithoutBuildCompilerFailure.new
+    cs = CompilerSelector.new(f)
+
+    assert f.fails_with? :clang
+    assert !(f.fails_with? :llvm)
+    assert !(f.fails_with? :gcc)
+
+    cs.select_compiler
+
+    assert_equal MacOS.default_compiler, ENV.compiler
+
+    ENV.send MacOS.default_compiler
+  end
+end