### Question:
EnvironmentVariableProvider { public char[] getEnvAsCharArray(String name) { return Optional.ofNullable(System.getenv(name)) .map(String::toCharArray) .orElse(null); }  String getEnv(String name); char[] getEnvAsCharArray(String name); boolean hasEnv(String name);  }### Answer:
@Test public void getEnvAsCharArray() { assertThat(provider.getEnvAsCharArray("env")).isNull(); }