[libfuzzer] support of custom libfuzzer options via .options file.

testing/libfuzzer/tests/fuzzer_launcher_test.cc

Index: testing/libfuzzer/tests/fuzzer_launcher_test.cc
diff --git a/testing/libfuzzer/tests/fuzzer_launcher_test.cc b/testing/libfuzzer/tests/fuzzer_launcher_test.cc
index 70f51fb3edf2f3d2c18994b2a36c93b4e6dbe4d7..7895a7aab2266f9a365c1e30e482e3bcff435343 100644
--- a/testing/libfuzzer/tests/fuzzer_launcher_test.cc
+++ b/testing/libfuzzer/tests/fuzzer_launcher_test.cc
@@ -37,3 +37,47 @@ TEST(FuzzerLauncherTest, Dict) {
   EXPECT_THAT(fuzzer_args[1], EndsWith("test_dict"));
   EXPECT_EQ("-custom_option", fuzzer_args[2]);
 }
+
+TEST(FuzzerLauncherTest, Params) {
+  base::FilePath exe_path;
+  PathService::Get(base::FILE_EXE, &exe_path);
+  std::string launcher_path =
+    exe_path.DirName().Append("test_params_launcher.sh").value();
+
+  std::string output;
+  base::CommandLine cmd({{launcher_path, "-custom_option"}});
+  bool success = base::GetAppOutputAndError(cmd, &output);
+  EXPECT_TRUE(success);
+  std::vector<std::string> fuzzer_args = base::SplitString(
+      output, "\n\r", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
+
+  EXPECT_EQ(3UL, fuzzer_args.size());
+
+  EXPECT_THAT(fuzzer_args[0], EndsWith("print_args.py"));
+  EXPECT_EQ("-custom_option", fuzzer_args[1]);
+  EXPECT_THAT(fuzzer_args[2], StartsWith("-test_param"));
+  EXPECT_THAT(fuzzer_args[2], EndsWith("test_value"));
+}
+
+TEST(FuzzerLauncherTest, DictAndParams) {
+  base::FilePath exe_path;
+  PathService::Get(base::FILE_EXE, &exe_path);
+  std::string launcher_path =
+    exe_path.DirName().Append("test_dict_and_params_launcher.sh").value();
+
+  std::string output;
+  base::CommandLine cmd({{launcher_path, "-custom_option"}});
+  bool success = base::GetAppOutputAndError(cmd, &output);
+  EXPECT_TRUE(success);
+  std::vector<std::string> fuzzer_args = base::SplitString(
+      output, "\n\r", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
+
+  EXPECT_EQ(4UL, fuzzer_args.size());
+
+  EXPECT_THAT(fuzzer_args[0], EndsWith("print_args.py"));
+  EXPECT_THAT(fuzzer_args[1], StartsWith("-dict"));
+  EXPECT_THAT(fuzzer_args[1], EndsWith("test_dict"));
+  EXPECT_EQ("-custom_option", fuzzer_args[2]);
+  EXPECT_THAT(fuzzer_args[3], StartsWith("-test_param"));
+  EXPECT_THAT(fuzzer_args[3], EndsWith("test_value"));
+}