unittests/Support/CommandLineTest.cpp

   1 //===- llvm/unittest/Support/CommandLineTest.cpp - CommandLine tests ------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/Support/CommandLine.h"
  11 #include "llvm/Config/config.h"
  12
  13 #include "gtest/gtest.h"
  14
  15 #include <string>
  16 #include <stdlib.h>
  17
  18 using namespace llvm;
  19
  20 namespace {
  21
  22 class TempEnvVar {
  23  public:
  24   TempEnvVar(const char *name, const char *value)
  25       : name(name) {
  26     const char *old_value = getenv(name);
  27     EXPECT_EQ(NULL, old_value) << old_value;
  28 #if HAVE_SETENV
  29     setenv(name, value, true);
  30 #else
  31 #   define SKIP_ENVIRONMENT_TESTS
  32 #endif
  33   }
  34
  35   ~TempEnvVar() {
  36 #if HAVE_SETENV
  37     // Assume setenv and unsetenv come together.
  38     unsetenv(name);
  39 #endif
  40   }
  41
  42  private:
  43   const char *const name;
  44 };
  45
  46 #ifndef SKIP_ENVIRONMENT_TESTS
  47
  48 const char test_env_var[] = "LLVM_TEST_COMMAND_LINE_FLAGS";
  49
  50 cl::opt<std::string> EnvironmentTestOption("env-test-opt");
  51 TEST(CommandLineTest, ParseEnvironment) {
  52   TempEnvVar TEV(test_env_var, "-env-test-opt=hello");
  53   EXPECT_EQ("", EnvironmentTestOption);
  54   cl::ParseEnvironmentOptions("CommandLineTest", test_env_var);
  55   EXPECT_EQ("hello", EnvironmentTestOption);
  56 }
  57
  58 #endif  // SKIP_ENVIRONMENT_TESTS
  59
  60 }  // anonymous namespace