nimcheck/tests/test_python_exhaustive.nim

## Python validator -- exhaustive edge-case tests.
## Auto-generated. Tests valid code, invalid code, encoding attacks,
## nesting extremes, unicode bombs, binary injection, and more.

import std/[unittest, strutils, strformat, json]
import ../src/nimcheck

proc checkValid(result: ValidationResult, context: string = "") =
  if result.errors.len > 0:
    var msg = &"Expected valid, got {result.errors.len} error(s)"
    if context.len > 0: msg.add(&" [{context}]")
    for e in result.errors: msg.add(&"\n  [{e.code}] {e.message}")
    doAssert false, msg

proc checkInvalid(result: ValidationResult, context: string = "") =
  if result.errors.len == 0:
    doAssert false, &"Expected errors, got none [{context}]"

proc checkHasError(result: ValidationResult, code: string, context: string = "") =
  var found = false
  for e in result.errors:
    if e.code == code: found = true
  if not found:
    var codes: seq[string] = @[]
    for e in result.errors: codes.add(e.code)
    let codesJoined = codes.join(", ")
    doAssert false, "Expected error code '" & code & "', got " & codesJoined & " [" & context & "]"

proc checkSeverity(result: ValidationResult, sev: string, context: string = "") =
  var found = false
  for e in result.errors:
    if $e.severity == sev: found = true
  if not found:
    doAssert false, &"Expected severity '{sev}', none found [{context}]"

suite "Python Exhaustive Tests":

  test "basic valid python":
    let src = "def hello(name):\n    return f\"Hello, {name}!\"\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "unclosed triple-quoted string":
    let src = "s = \"\"\"hello\nworld\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "f-string with nested":
    let src = "def test():\n    return f\"{ {k: v for k, v in {'a': 1}.items()} }\"\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "unclosed f-string":
    let src = "x = f\"hello {\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "decorator syntax":
    let src = "@decorator\ndef func(): pass\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "class inheritance":
    let src = "class Child(Parent, Mixin): pass\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "lambda expression":
    let src = "f = lambda x, y: x + y\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "list comprehension":
    let src = "squares = [x**2 for x in range(10)]\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "generator expression":
    let src = "gen = (x**2 for x in range(10))\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "async/await":
    let src = "import asyncio\nasync def test():\n    await asyncio.sleep(1)\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "type hints":
    let src = "def func(x: int, y: str) -> bool: return True\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "walrus operator":
    let src = "if (n := len(x)) > 0: pass\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "raise and assert":
    let src = "def test():\n    raise ValueError(\"bad\")\n    assert False, \"msg\"\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "try-except-finally":
    let src = "try:\n    pass\nexcept Exception as e:\n    pass\nfinally:\n    pass\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "with statement":
    let src = "with open('file') as f:\n    data = f.read()\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "unclosed regular string":
    let src = "x = \"unclosed\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "backslash continuation":
    let src = "total = 1 + 2 + 3 \\\n    + 4 + 5\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "UTF-8 identifiers":
    let src = "def café(): pass\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "empty source":
    let src = ""
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "null byte injection":
    let src = "x = 1\x00y = 2\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "match statement 3.10+":
    let src = "def test(value):\n    match value:\n        case 1: return 'one'\n        case _: return 'other'\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "exception group":
    let src = "try:\n    pass\nexcept* ValueError:\n    pass\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0

  test "multi-line string escapes":
    let src = "s = \"line1\\\nline2\\\nline3\"\n"
    let result = validateSource(src, flavor = lfPython)
    check result.errors.len >= 0