tests:
  # Basic Stack Operations
  - name: "Simple value push"
    stdin: |
      42 print
    stdout: |
      42
    exit: success

  - name: "Multiple values and operations"
    stdin: |
      3 4 + print
      10 5 - print
    stdout: |
      7
      5
    exit: success

  - name: "Stack manipulation - dup"
    stdin: |
      5 dup print print
    stdout: |
      5
      5
    exit: success

  - name: "Stack manipulation - swap"
    stdin: |
      10 20 swap print print
    stdout: |
      10
      20
    exit: success

  - name: "Stack manipulation - over"
    stdin: |
      5 10 over print print print
    stdout: |
      5
      10
      5
    exit: success

  - name: "Stack manipulation - rot"
    stdin: |
      1 2 3 rot print print print
    stdout: |
      1
      2
      3
    exit: success

  - name: "Stack depth"
    stdin: |
      1 2 3 depth print
    stdout: |
      3
    exit: success

  # Arithmetic Operations
  - name: "Basic arithmetic - all operators"
    stdin: |
      10 3 + print
      10 3 - print
      10 3 * print
      10 3 / print
      10 3 % print
    stdout: |
      13
      7
      30
      3
      1
    exit: success

  - name: "Exponentiation"
    stdin: |
      2 8 ^ print
      3 3 ^ print
    stdout: |
      256
      27
    exit: success

  - name: "Floating point arithmetic"
    stdin: |
      3.14 2.0 + print
      10.5 2.5 * print
    stdout: |
      5.14
      26.25
    exit: success

  - name: "Mathematical functions"
    stdin: |
      16 sqrt print
      -42 abs print
      3.7 round print
      3.14 floor print
      3.14 ceil print
    stdout: |
      4.0
      42
      4.0
      3.0
      4.0
    exit: success

  - name: "Min and max"
    stdin: |
      3 5 min print
      3 5 max print
    stdout: |
      3
      5
    exit: success

  # Comparison Operations
  - name: "Comparison operators"
    stdin: |
      5 3 > print
      5 3 < print
      5 5 == print
      5 3 != print
      5 5 >= print
      3 5 <= print
    stdout: |
      true
      false
      true
      true
      true
      true
    exit: success

  # Logical Operations
  - name: "Logical operators"
    stdin: |
      true false and print
      true false or print
      false not print
    stdout: |
      false
      true
      true
    exit: success

  # Bitwise Operations
  - name: "Bitwise operations"
    stdin: |
      0xFF 0x0F bitand print
      0xF0 0x0F bitor print
      0xFF 0x0F bitxor print
      4 2 shl print
      16 2 shr print
    stdout: |
      15
      255
      240
      16
      4
    exit: success

  # String Operations
  - name: "String concatenation"
    stdin: |
      "hello" " world" concat print
    stdout: |
      hello world
    exit: success

  - name: "String length and substring"
    stdin: |
      "hello" length print
      "hello" 1 3 substr print
    stdout: |
      5
      el
    exit: success

  - name: "String split and join"
    stdin: |
      "a,b,c" "," split print
    stdout: |
      ["a" "b" "c"]
    exit: success

  - name: "String searching"
    stdin: |
      "hello" "hel" starts_with print
      "hello" "lo" ends_with print
    stdout: |
      true
      true
    exit: success

  - name: "String trimming and replacement"
    stdin: |
      "  hello  " trim print
      "hello world" "world" "Stack" replace print
    stdout: |
      hello
      hello Stack
    exit: success

  # Array Operations
  - name: "Array literals and access"
    stdin: |
      [1 2 3 4 5] print
      [1 2 3 4 5] 2 at print
      [1 2 3 4 5] length print
    stdout: |
      [1 2 3 4 5]
      3
      5
    exit: success

  - name: "Array slice"
    stdin: |
      [10 20 30 40 50] 1 3 slice print
    stdout: |
      [20 30]
    exit: success

  - name: "Array map"
    stdin: |
      [1 2 3 4] { 2 * } map print
    stdout: |
      [2 4 6 8]
    exit: success

  - name: "Array filter"
    stdin: |
      [1 2 3 4 5] { 2 % 0 == } filter print
    stdout: |
      [2 4]
    exit: success

  - name: "Array reduce"
    stdin: |
      [1 2 3 4] 0 { + } reduce print
    stdout: |
      10
    exit: success

  - name: "Array sum and mean"
    stdin: |
      [1 2 3 4 5] sum print
      [1 2 3 4 5] mean print
    stdout: |
      15
      3.0
    exit: success

  - name: "Array zip and enumerate"
    stdin: |
      [1 2 3] [4 5 6] zip print
      ["a" "b" "c"] enumerate print
    stdout: |
      [[1 4] [2 5] [3 6]]
      [[0 "a"] [1 "b"] [2 "c"]]
    exit: success

  - name: "Array reverse and transpose"
    stdin: |
      [1 2 3] reverse print
      [[1 2] [3 4]] transpose print
    stdout: |
      [3 2 1]
      [[1 3] [2 4]]
    exit: success

  # Function Definition and Calling
  - name: "Simple function definition"
    stdin: |
      (Number -- Number) { dup * } ::square fn
      5 square print
    stdout: |
      25
    exit: success

  - name: "Function with multiple operations"
    stdin: |
      (Number Number -- Number Number) {
        over over / swap %
      } ::divmod fn
      10 3 divmod print print
    stdout: |
      3
      1
    exit: success

  - name: "Recursive factorial"
    stdin: |
      (Number -- Number) {
        dup 1 <=
          { drop 1 }
          { dup 1 - factorial * }
        if
      } ::factorial fn
      5 factorial print
    stdout: |
      120
    exit: success

  # Control Flow - Conditionals
  - name: "Simple if statement"
    stdin: |
      5 0 > { "positive" print } { "negative" print } if
    stdout: |
      positive
    exit: success

  - name: "If with else branch"
    stdin: |
      -3 0 > { "positive" print } { "non-positive" print } if
    stdout: |
      non-positive
    exit: success

  - name: "Nested conditionals"
    stdin: |
      5 0 >
        {
          5 10 
            { "between 0 and 10" print }
            { "greater than 10" print }
          if
        }
        { "negative or zero" print }
      if
    stdout: |
      between 0 and 10
    exit: success

  # Control Flow - Loops
  - name: "For loop"
    stdin: |
      1 5 { dup print } for
    stdout: |
      1
      2
      3
      4
      5
    exit: success

  - name: "While loop"
    stdin: |
      0
      { dup 3 < }
      {
        dup print
        1 +
      }
      while
      drop
    stdout: |
      0
      1
      2
    exit: success

  - name: "Loop with break"
    stdin: |
      1 10 {
        dup 5 ==
          { break }
          { dup print }
        if
      } for
    stdout: |
      1
      2
      3
      4
    exit: success

  - name: "Loop with continue"
    stdin: |
      1 5 {
        dup 2 % 0 ==
          { continue }
          { dup print }
        if
      } for
    stdout: |
      1
      3
      5
    exit: success

  # Structs
  - name: "Struct definition and creation"
    stdin: |
      (Number Number --) { x: y: } ::Point struct
      3.0 4.0 Point print
    stdout: |
      Point { x: 3.0, y: 4.0 }
    exit: success

  - name: "Struct field access"
    stdin: |
      (Number Number --) { x: y: } ::Point struct
      3.0 4.0 Point
      dup ::x get print
      ::y get print
    stdout: |
      3.0
      4.0
    exit: success

  - name: "Struct field modification"
    stdin: |
      (Number Number --) { x: y: } ::Point struct
      3.0 4.0 Point
      10.0 ::x set
      ::x get print
    stdout: |
      10.0
    exit: success

  # Unions
  - name: "Union creation - Option type"
    stdin: |
      (T --) { Some(T) None } ::Option union
      42 Option::Some print
      Option::None print
    stdout: |
      Option::Some(42)
      Option::None
    exit: success

  - name: "Pattern matching with Option"
    stdin: |
      (T --) { Some(T) None } ::Option union
      42 Option::Some {
        Some(x) => { x print }
        None => { "Nothing" print }
      } match
    stdout: |
      42
    exit: success

  - name: "Result type pattern matching"
    stdin: |
      (T E --) { Ok(T) Err(E) } ::Result union
      "success" Result::Ok {
        Ok(val) => { val print }
        Err(e) => { "Error: " e concat print }
      } match
    stdout: |
      success
    exit: success

  # Enums
  - name: "Enum definition and usage"
    stdin: |
      { Pending: Active: Complete: } ::Status enum
      Status::Active print
    stdout: |
      Status::Active
    exit: success

  # Traits
  - name: "Trait implementation for struct"
    stdin: |
      (Number Number --) { x: y: } ::Point struct
      ::Addable {
        (Self Self -- Self) {
          over ::x get over ::x get +
          swap ::y get swap ::y get +
          Point
        } +:
      } ::Point impl
      1.0 2.0 Point 3.0 4.0 Point + print
    stdout: |
      Point { x: 4.0, y: 6.0 }
    exit: success

  # Type Conversions
  - name: "Type conversions"
    stdin: |
      42 to_f64 print
      3.14 to_i32 print
      42 to_str print
    stdout: |
      42.0
      3
      "42"
    exit: success

  - name: "String parsing"
    stdin: |
      "123" parse print
    stdout: |
      123
    exit: success

  # Constants
  - name: "Constant definition and usage"
    stdin: |
      3.1415926535 ::pi const
      5 dup * pi * print
    stdout: |
      78.53981633975
    exit: success

  # Lambda and Eval
  - name: "Lambda function"
    stdin: |
      { dup * } lambda ::square swap
      5 square eval print
    stdout: |
      25
    exit: success

  - name: "Eval operator"
    stdin: |
      "2 3 +" eval print
    stdout: |
      5
    exit: success

  # Reflection
  - name: "Type checking with type_of"
    stdin: |
      42 type_of print
      "hello" type_of print
    stdout: |
      ::i64
      ::String
    exit: success

  - name: "Trait checking with implements"
    stdin: |
      42 ::Addable implements print
      42 ::Drawable implements print
    stdout: |
      true
      false
    exit: success

  # Assertions
  - name: "Passing assertion"
    stdin: |
      { 2 3 + } { 5 == } assert
      "Test passed" print
    stdout: |
      Test passed
    exit: success

  - name: "Failing assertion"
    stdin: |
      { 2 3 + } { 6 == } assert
    stderr: |
      Assertion failed
    exit: error

  # Randomness
  - name: "Random number generation with seed"
    stdin: |
      12345 seed
      rand 0.0 >= print
      rand 1.0 < print
    stdout: |
      true
      true
    exit: success

  # Complex Examples
  - name: "FizzBuzz (1-15)"
    stdin: |
      (Number -- ) {
        dup 15 % 0 ==
          { drop "FizzBuzz" print }
          {
            dup 3 % 0 ==
              { drop "Fizz" print }
              {
                dup 5 % 0 ==
                  { drop "Buzz" print }
                  { print }
                if
              }
            if
          }
        if
      } ::fizzbuzz fn
      1 15 { fizzbuzz } for
    stdout: |
      1
      2
      Fizz
      4
      Buzz
      Fizz
      7
      8
      Fizz
      Buzz
      11
      Fizz
      13
      14
      FizzBuzz
    exit: success

  - name: "Sum of squares of even numbers"
    stdin: |
      [1 2 3 4 5 6 7 8 9 10]
        { 2 % 0 == } filter
        { dup * } map
        0 { + } reduce
      print
    stdout: |
      220
    exit: success

  # Error Cases
  - name: "Type mismatch error"
    stdin: |
      "hello" 5 +
    stderr: |
      Type error
    exit: error

  - name: "Stack underflow"
    stdin: |
      +
    stderr: |
      Stack underflow
    exit: error

  - name: "Undefined identifier"
    stdin: |
      undefined_function
    stderr: |
      Undefined identifier: undefined_function
    exit: error

  - name: "Division by zero"
    stdin: |
      10 0 /
    stderr: |
      Division by zero
    exit: error

  # Character Literals
  - name: "Character literals"
    stdin: |
      'A' print
      '\n' print
      '\u{1F600}' print
    stdout: |
      'A'
      '\n'
      '😀'
    exit: success

  # Multiple test with timeout
  - name: "Complex computation with timeout"
    stdin: |
      1 100 { dup * } map 0 { + } reduce print
    stdout: |
      338350
    exit: success
    timeout: 2.0

  # Comments
  - name: "Comments ignored"
    stdin: |
      // This is a comment
      5 // inline comment
      3 + // another comment
      print
    stdout: |
      8
    exit: success

  # Array of structs
  - name: "Array of structs"
    stdin: |
      (Number Number --) { x: y: } ::Point struct
      [1 2 Point 3 4 Point] print
    stdout: |
      [Point { x: 1, y: 2 }, Point { x: 3, y: 4 }]
    exit: success

  # Format strings
  - name: "String formatting"
    stdin: |
      "x=%d, y=%d" [5 10] format print
    stdout: |
      x=5, y=10
    exit: success

  # Underscore separators in literals
  - name: "Underscore separators in numbers"
    stdin: |
      1_000_000 print
      3_1415.92_65 print
    stdout: |
      1000000
      3141.9265
    exit: success