### Question:
ReflectionUtil { public static @NotNull String getMethodId(Method method) { return getFormattedMethodSignature(method).replaceAll(" ", ""); }  static @NotNull List<String> getArgsForMethod(@NotNull List<String> args, @NotNull Method method); static @NotNull String getFormattedMethodSignature(Method method); static @NotNull String getMethodId(Method method); static @NotNull String getArgMismatchString(Method method);  }### Answer:
@Test public void ensureNoWhitespaceInMethodIds() throws NoSuchMethodException { Method method = ReflTestClass.class.getMethod("getSomeNumbers"); String id = ReflectionUtil.getMethodId(method); long whitespaceCount = id.chars() .filter(Character::isWhitespace) .count(); if (whitespaceCount != 0) { System.out.println("Illegal whitespace chars found in id: " + id); } assertEquals(0, whitespaceCount); }