os.Setenv("FOO", "bar")
	s := C.GoString(C.getenv(C.CString("FOO")))
	if s != "bar" {
		panic("bad setenv, environment variable only has value \"" + s + "\"")
	}
	os.Unsetenv("FOO")
	s = C.GoString(C.getenv(C.CString("FOO")))
	if s != "" {
		panic("bad unsetenv, environment variable still has value \"" + s + "\"")
	}

	return syscall.Setenv(key, value)
}

func Clearenv() {
	syscall.Clearenv()
}

func Environ() []string {
	return syscall.Environ()
}

func Unsetenv(key string) error {
	return syscall.Unsetenv(key)

		env = append(env, UTF16ToString(entry))
		block = (*uint16)(unsafe.Add(end, size))
	}
	return env, nil
}

func Unsetenv(key string) error {
	return syscall.Unsetenv(key)

func Setenv(key, value string) error {
	err := syscall.Setenv(key, value)
	if err != nil {
		return NewSyscallError("setenv", err)
	}
	return nil
}

// Unsetenv unsets a single environment variable.
func Unsetenv(key string) error {
	return syscall.Unsetenv(key)
}

// Clearenv deletes all environment variables.
func Clearenv() {
	syscall.Clearenv()
}

		}
		if !strings.Contains(str, expectedStr) {
			t.Errorf("Test %d: expected: %s, got: %s", i+1, expectedStr, str)
		}
		globalIsCICD = sci
		os.Unsetenv("MARATHON_APP_LABEL_DCOS_PACKAGE_VERSION")
		os.Unsetenv(testCase.envName)
	}
}

// Tests if the environment we are running is in DCOS.
func TestIsDCOS(t *testing.T) {
	sci := globalIsCICD
	globalIsCICD = false
	defer func() {

// The GOROOT directory is empty if we are invoking a command named
// gotoolchain found in $PATH.
func execGoToolchain(gotoolchain, dir, exe string) {
	os.Setenv(targetEnv, gotoolchain)
	if dir == "" {
		os.Unsetenv("GOROOT")
	} else {
		os.Setenv("GOROOT", dir)
	}

	// On Windows, there is no syscall.Exec, so the best we can do
	// is run a subprocess and exit with the same status.

	if err := os.Setenv(k, v); err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() {
		if oldset {
			if err := os.Setenv(k, old); err != nil {
				t.Fatal(err)
			}
		} else {
			if err := os.Unsetenv(k); err != nil {
				t.Fatal(err)
			}
		}
	})
}

// SetAtomicBoolForTest sets a variable for the duration of a test, then resets it once the test is complete atomically.

import java.lang.reflect.Field;
import java.util.Map;

/**
 * Uses reflection to update private environment state
 */
public class ReflectiveEnvironment {

    public void unsetenv(String name) {
        Map<String, String> map = getEnv();
        map.remove(name);
        if (OperatingSystem.current().isWindows()) {
            Map<String, String> env2 = getWindowsEnv();
            env2.remove(name);

    }

    @Override
    public void removeEnvironmentVariable(String name) throws NativeIntegrationException {
        removeNativeEnvironmentVariable(name);
        reflectiveEnvironment.unsetenv(name);
    }

    protected abstract void removeNativeEnvironmentVariable(String name);

    @Override
    public EnvironmentModificationResult maybeRemoveEnvironmentVariable(String name) {

	if isPresent(EnvKMSSecretKey) && os.Getenv(EnvKMSSecretKey) == "" {
		os.Unsetenv(EnvKMSSecretKey)
	}
	if isPresent(EnvKMSSecretKeyFile) {
		if filename := os.Getenv(EnvKMSSecretKeyFile); filename == "" {
			os.Unsetenv(EnvKMSSecretKeyFile)
		} else if _, err := os.Stat(filename); errors.Is(err, os.ErrNotExist) {
			os.Unsetenv(EnvKMSSecretKeyFile)
		}
	}