Add infrastructure for known failing tests

Author: kewisch

test/failure_test.js

@@ -0,0 +1,40 @@
+import assert from "assert";
+
+
+/**
+ * The tests in this suite are known to fail, due to a bug in the library. If the tests here start
+ * failing in the sense of mocha, then the test is passing and you have either:
+ *
+ * 1) Fixed the bug (yay! remove the test)
+ * 2) Triggered some unknown underlying issue (boo! investigate)
+ *
+ * When adding something here, make sure to link the issue.
+ */
+suite('Known failures', function() {
+  function testKnownFailure(message, testFn, only) {
+    let runner = only ? test.only : test;
+    runner(message, function(done) {
+      try {
+        testFn(done);
+        done(new Error("Expected test fo fail"));
+      } catch (e) {
+        if (e instanceof assert.AssertionError) {
+          this.skip();
+        } else {
+          done(e);
+        }
+      }
+    });
+  }
+  testKnownFailure.only = function(message, testFn) {
+    return testKnownFailure(message, testFn, true);
+  };
+
+  // Escaped parameters are not correctly parsed
+  // Please see https://github.com/kewisch/ical.js/issues/669
+  testKnownFailure('Parameter escaping', function() {
+    let subject = ICAL.Property.fromString(`ATTENDEE;CN="Z\\;":mailto:[email protected]`);
+    assert.equal(subject.getParameter("cn"), "Z\\;");
+    assert.equal(subject.getFirstValue(), "mailto:[email protected]");
+  });
+});