assertInvalid("text /plain", "No subtype found for: \"text /plain\"")
    assertInvalid("text/ plain", "No subtype found for: \"text/ plain\"")
    assertInvalid(
      "text/pl@in",
      "Parameter is not formatted correctly: \"@in\" for: \"text/pl@in\"",
    )
    assertInvalid(
      "text/plain; a",
      "Parameter is not formatted correctly: \"a\" for: \"text/plain; a\"",
    )
    assertInvalid(
      "text/plain; a=",