43 lines
1 KiB
Dart
43 lines
1 KiB
Dart
import 'package:test/test.dart';
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import 'common.dart';
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main() {
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test('variables', () {
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expect(r'$a', isVariable('a'));
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expect(r'$abc', isVariable('abc'));
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expect(r'$abc123', isVariable('abc123'));
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expect(r'$_', isVariable('_'));
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expect(r'$___', isVariable('___'));
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expect(r'$_123', isVariable('_123'));
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});
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test('exceptions', () {
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var throwsSyntaxError = predicate((x) {
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var parser = parse(x.toString())..parseVariable();
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return parser.errors.isNotEmpty;
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}, 'fails to parse variable');
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expect(r'$', throwsSyntaxError);
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});
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}
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Matcher isVariable(String name) => new _IsVariable(name);
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class _IsVariable extends Matcher {
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final String name;
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_IsVariable(this.name);
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@override
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Description describe(Description description) {
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return description.add('parses as a variable named "$name"');
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}
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@override
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bool matches(item, Map matchState) {
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var p = parse(item.toString());
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var v = p.parseVariable();
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return equals(name).matches(v?.name, matchState);
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}
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}
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