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Behavior specs cleanup: Improve optional specs

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David Majda 2015-01-16 15:08:11 +01:00
parent ade2c249f2
commit c377eff876
1 changed files with 13 additions and 4 deletions
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13
spec/behavior/generated-parser-behavior.spec.js
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@ -615,11 +615,20 @@ describe("generated parser behavior", function() {
}); });
describe("optional", function() { describe("optional", function() {
it("matches correctly", function() { describe("when the expression matches", function() {
it("returns its match result", function() {
var parser = PEG.buildParser('start = "a"?', options);
expect(parser).toParse("a", "a");
});
});
describe("when the expression doesn't match", function() {
it("returns |null|", function() {
var parser = PEG.buildParser('start = "a"?', options); var parser = PEG.buildParser('start = "a"?', options);
expect(parser).toParse("", null); expect(parser).toParse("", null);
expect(parser).toParse("a", "a"); });
}); });
}); });