Tests/NorgKitTests/Helpers/ASCIIByteSetTests.swift


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import Testing

@testable import NorgKit

struct ASCIIByteSetTests {

  @Test func containsLowBytes() {
    // `*` (0x2A) and `-` (0x2D) live in the low 64-bit word.
    let set = ASCIIByteSet("*-")
    #expect(set.contains(UInt8(ascii: "*")))
    #expect(set.contains(UInt8(ascii: "-")))
    #expect(!set.contains(UInt8(ascii: "/")))
  }

  @Test func containsHighBytes() {
    // `~` (0x7E) and `_` (0x5F) live in the high 64-bit word.
    let set = ASCIIByteSet("~_")
    #expect(set.contains(UInt8(ascii: "~")))
    #expect(set.contains(UInt8(ascii: "_")))
    #expect(!set.contains(UInt8(ascii: "x")))
  }

  @Test func spansBothWords() {
    let set = ASCIIByteSet("*~")
    #expect(set.contains(UInt8(ascii: "*")))
    #expect(set.contains(UInt8(ascii: "~")))
  }

  @Test func rejectsNonAsciiAndOutOfSetBytes() {
    let set = ASCIIByteSet("*")
    #expect(!set.contains(0))  // NUL, low word, unset
    #expect(!set.contains(200))  // beyond ASCII, never stored
    #expect(!set.contains(127))  // high word, unset
  }

  @Test func emptySetContainsNothing() {
    let set = ASCIIByteSet("")
    #expect(!set.contains(UInt8(ascii: "*")))
    #expect(!set.contains(0))
    #expect(!set.contains(127))
  }
}