nimcheck/tests/test_c_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 with includes":
    let src = "#include <stdio.h>\nint main(void) { return 0; }\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

  test "unclosed string literal":
    let src = "#include <stdio.h>\nint main(void) { char *s = \"hello; return 0; }\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

  test "mismatched brackets":
    let src = "#include <stdio.h>\nint main(void) { int a[3) = {1,2,3}; return 0; }\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

  test "unclosed block comment":
    let src = "#include <stdio.h>\nint main(void) { /* unclosed comment return 0; }\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

  test "preprocessor directives":
    let src = "#include <stdio.h>\n#define MAX 100\nint main(void) { return MAX; }\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

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

  test "only comments":
    let src = "/* just a comment */\n// another comment\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

  test "nested function calls":
    let src = "#include <stdio.h>\nint main(void) { printf(\"%d\\n\", abs(-5)); return 0; }\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

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

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

  test "unicode in string":
    let src = "#include <stdio.h>\nint main(void) { char *s = \"caf\u00e9\"; return 0; }\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

  test "typedef and struct":
    let src = "typedef struct { int x; int y; } Point;\nint main(void) { Point p = {1,2}; return 0; }\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

  test "multiple function definitions":
    let src = "int add(int a, int b) { return a + b; }\nint sub(int a, int b) { return a - b; }\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

  test "pointer declarations":
    let src = "int main(void) { int x = 42; int *ptr = &x; return *ptr; }\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

  test "missing semicolon":
    let src = "#include <stdio.h>\nint main(void) { int x = 5 return x; }\n"
    let result = validateSource(src, flavor = lfC)
    check result.errors.len >= 0

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