format_exception_test.dart

// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

library format_exception_test;

import "package:expect/expect.dart";

test(exn, message, source, offset, toString) {
  Expect.equals(message, exn.message);
  Expect.equals(source, exn.source);
  Expect.equals(offset, exn.offset);
  Expect.equals(toString, exn.toString());
}

main() {
  var e;
  e = new FormatException();
  test(e, "", null, null, "FormatException");
  e = new FormatException("");
  test(e, "", null, null, "FormatException");

  e = new FormatException("message");
  test(e, "message", null, null, "FormatException: message");

  e = new FormatException("message", "source");
  test(e, "message", "source", null, "FormatException: message\nsource");

  e = new FormatException("message", "source" * 25);
  test(
    e,
    "message",
    "source" * 25,
    null,
    "FormatException: message\n" + "source" * 12 + "sou...",
  );
  e = new FormatException("message", "source" * 25);
  test(
    e,
    "message",
    "source" * 25,
    null,
    "FormatException: message\n" + "source" * 12 + "sou...",
  );
  e = new FormatException("message", "s1\nsource\ns2");
  test(
    e,
    "message",
    "s1\nsource\ns2",
    null,
    "FormatException: message\n" + "s1\nsource\ns2",
  );

  var o = new Object();
  e = new FormatException("message", o, 10);
  test(e, "message", o, 10, "FormatException: message (at offset 10)");

  e = new FormatException("message", "source", 3);
  test(
    e,
    "message",
    "source",
    3,
    "FormatException: message (at character 4)\nsource\n   ^\n",
  );

  e = new FormatException("message", "s1\nsource\ns2", 6);
  test(
    e,
    "message",
    "s1\nsource\ns2",
    6,
    "FormatException: message (at line 2, character 4)\nsource\n   ^\n",
  );

  var longline = "watermelon cantaloupe " * 8 + "watermelon"; // Length > 160.
  var longsource = (longline + "\n") * 25;
  var line10 = (longline.length + 1) * 9;
  e = new FormatException("message", longsource, line10);
  test(
    e,
    "message",
    longsource,
    line10,
    "FormatException: message (at line 10, character 1)\n"
        "${longline.substring(0, 75)}...\n^\n",
  );

  e = new FormatException("message", longsource, line10 - 1);
  test(
    e,
    "message",
    longsource,
    line10 - 1,
    "FormatException: message (at line 9, "
        "character ${longline.length + 1})\n"
        "...${longline.substring(longline.length - 75)}\n"
        "${' ' * 78}^\n",
  );

  var half = longline.length ~/ 2;
  e = new FormatException("message", longsource, line10 + half);
  test(
    e,
    "message",
    longsource,
    line10 + half,
    "FormatException: message (at line 10, character ${half + 1})\n"
        "...${longline.substring(half - 36, half + 36)}...\n"
        "${' ' * 39}^\n",
  );

  var sourceNL = "\nsource with leading NL";
  e = new FormatException("message", sourceNL, 2);
  test(
    e,
    "message",
    sourceNL,
    2,
    "FormatException: message (at line 2, character 2)\n"
        "source with leading NL\n"
        " ^\n",
  );

  var sourceNL2 = "\n\nsource with leading NL";
  e = new FormatException("message", sourceNL2, 2);
  test(
    e,
    "message",
    sourceNL2,
    2,
    "FormatException: message (at line 3, character 1)\n"
        "source with leading NL\n"
        "^\n",
  );
}