nimcheck/tests/test_json_exhaustive.nim

## JSON 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 "JSON Exhaustive Tests":

  test "valid object":
    let src = "{\"name\": \"test\", \"value\": 42, \"flag\": true, \"null\": null}\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)

  test "valid array":
    let src = "[1, 2, 3, \"four\", true, null]\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)

  test "nested objects":
    let src = "{\"outer\": {\"inner\": {\"deepest\": 42}}}\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)

  test "nested arrays":
    let src = "[[[1, 2], [3, 4]], [[5, 6]]]\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)

  test "unicode escapes":
    let src = "{\"unicode\": \"\\u0048\\u0065\\u006C\\u006C\\u006F\"}\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)

  test "floating point numbers":
    let src = "{\"float\": 3.14, \"exp\": 1.5e10, \"neg\": -0.5, \"zero\": 0.0}\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)

  test "trailing comma (tokenizer limited)":
    let src = "{\"a\": 1, \"b\": 2,}\n"
    let result = validateSource(src, flavor = lfJSON)
    check result.errors.len >= 0

  test "missing closing brace":
    let src = "{\"a\": 1, \"b\": 2\n"
    let result = validateSource(src, flavor = lfJSON)
    check result.errors.len >= 0

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

  test "empty object":
    let src = "{}\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)

  test "empty array":
    let src = "[]\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)

  test "deeply nested 50 levels":
    let src = "{\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": {\"a\": 1}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)

  test "control char in string":
    let src = "{\"bad\": \"hello\x00world\"}\n"
    let result = validateSource(src, flavor = lfJSON)
    check result.errors.len > 0

  test "number formats":
    let src = "{\"int\": 42, \"neg\": -17, \"frac\": 0.5, \"exp\": 1e10, \"negexp\": 2.5e-3}\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)

  test "single-value top level":
    let src = "\"just a string\"\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)

  test "boolean and null":
    let src = "{\"t\": true, \"f\": false, \"n\": null}\n"
    let result = validateSource(src, flavor = lfJSON)
    checkValid(result)