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我想定義匹配器來檢查分析器是否可以接受字符串。我做到了,但感覺不好。爲單元測試定義「accept」和「notAccept」匹配的更好方法
飛鏢單元測試代碼:
library test_parser;
import 'package:unittest/unittest.dart';
import '../lib/shark_parser.dart';
main() {
SharkParser parser;
setUp(() {
parser = new SharkParser();
});
tearDown(() {
parser = null;
});
group("paramType parser",() {
test("should accept valid types",() {
expect(parser.paramType(), accept("String"));
expect(parser.paramType(), accept("int"));
expect(parser.paramType(), accept("List"));
expect(parser.paramType(), accept("List<User>"));
});
test("should not accept invalid types",() {
expect(parser.paramType(), notAccept("#"));
expect(parser.paramType(), notAccept("0"));
expect(parser.paramType(), notAccept("String()"));
expect(parser.paramType(), notAccept("List<User>"));
});
});
}
的匹配器:
Matcher accept(String matchingString) => new AcceptMatcher(matchingString);
Matcher notAccept(String matchingString) => new NotAcceptMatcher(matchingString);
class NotAcceptMatcher extends Matcher {
String matchingString;
NotAcceptMatcher(this.matchingString);
bool matches(item, Map matchState) {
return !item.end().accept(matchingString);
}
Description describe(Description description) {
return description.add("parser not accept string: $matchingString");
}
Description describeMismatch(item, Description mismatchDescription,
Map matchState, bool verbose) {
mismatchDescription.add("accepts it");
return mismatchDescription;
}
}
class AcceptMatcher extends Matcher {
String matchingString;
AcceptMatcher(this.matchingString);
bool matches(item, Map matchState) {
return item.end().accept(matchingString);
}
Description describe(Description description) {
return description.add("parser accept string: $matchingString");
}
Description describeMismatch(item, Description mismatchDescription,
Map matchState, bool verbose) {
mismatchDescription.add("doesn't accept");
return mismatchDescription;
}
}
你可以看到我有定義兩個匹配器NotAcceptMatcher
和AcceptMatcher
。邏輯非常相似,但我不知道如何簡化。
有沒有其他更簡單的解決方案來做到這一點?