expectError on array arguments mismatch

[maximelkin]

Following example:

interface A {
  test1(a: '*'): string;
  test1(a: 'a' | 'b'): string;
  test1(a: ReadonlyArray<'a' | 'b'>): string;
  test1(a: never): string;
}
const a: A = null as any;

expectError(a.test1(['a', 'bad']));

No overload matches this call.
  The last overload gave the following error.
    Type string is not assignable to type never.
      Type string is not assignable to type never. 

[maximelkin]

tsd gives error because test1(...) emits 2 errors for each array item.
Solution is to wrap with expectError() n times where n is errors count