nimcheck/tests/test_csharp_exhaustive.nim

## C# 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 "C# Exhaustive Tests":

  test "basic valid C#":
    let src = "using System;\nclass Program { static void Main() { Console.WriteLine(\"hi\"); } }\n"
    let result = validateSource(src, flavor = lfCSharp)
    check result.errors.len >= 0

  test "unclosed string":
    let src = "using System;\nclass Program { static void Main() { string s = \"unclosed; } }\n"
    let result = validateSource(src, flavor = lfCSharp)
    check result.errors.len >= 0

  test "class with properties":
    let src = "class Person { public string Name { get; set; } }\n"
    let result = validateSource(src, flavor = lfCSharp)
    check result.errors.len >= 0

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

  test "null byte injection":
    let src = "int x = 5;\x00int y = 10;\n"
    let result = validateSource(src, flavor = lfCSharp)
    check result.errors.len >= 0

  test "generic class":
    let src = "using System.Collections.Generic;\nclass Box<T> { public T Value { get; set; } }\n"
    let result = validateSource(src, flavor = lfCSharp)
    check result.errors.len >= 0

  test "linq expression":
    let src = "using System.Linq;\nvar result = from x in items where x > 5 select x;\n"
    let result = validateSource(src, flavor = lfCSharp)
    check result.errors.len >= 0

  test "async method":
    let src = "using System.Threading.Tasks;\nclass Test { async Task<int> GetAsync() { return await Task.Run(() => 42); } }\n"
    let result = validateSource(src, flavor = lfCSharp)
    check result.errors.len >= 0

  test "deep bracket nesting":
    let src = "int x = ((((((((((((((((((((42))))))))))))))))))));\n"
    let result = validateSource(src, flavor = lfCSharp)
    check result.errors.len >= 0

  test "interface and implementation":
    let src = "interface IFoo { void Bar(); }\nclass Foo : IFoo { public void Bar() {} }\n"
    let result = validateSource(src, flavor = lfCSharp)
    check result.errors.len >= 0

  test "struct definition":
    let src = "struct Point { public int X; public int Y; }\n"
    let result = validateSource(src, flavor = lfCSharp)
    check result.errors.len >= 0

  test "very long single line":
    let src = "int x = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa;\n"
    let result = validateSource(src, flavor = lfCSharp)
    check result.errors.len >= 0