diff --git a/moment/moment-external-tests.ts b/moment/moment-external-tests.ts
index c5855c12c..b76752b11 100644
--- a/moment/moment-external-tests.ts
+++ b/moment/moment-external-tests.ts
@@ -196,10 +196,17 @@ moment.isMoment();
 moment.isMoment(new Date());
 moment.isMoment(moment());
 
+moment.isDate(new Date());
+moment.isDate(/regexp/);
+
 moment.isDuration();
 moment.isDuration(new Date());
 moment.isDuration(moment.duration());
 
+moment().isBetween(moment(), moment());
+moment().isBetween(new Date(), new Date());
+moment().isBetween([1,1,2000], [1,1,2001], "year");
+
 moment.localeData('fr');
 moment(1316116057189).fromNow();
 
diff --git a/moment/moment-tests.ts b/moment/moment-tests.ts
index 16490d2e1..04c075352 100644
--- a/moment/moment-tests.ts
+++ b/moment/moment-tests.ts
@@ -196,10 +196,17 @@ moment.isMoment();
 moment.isMoment(new Date());
 moment.isMoment(moment());
 
+moment.isDate(new Date());
+moment.isDate(/regexp/);
+
 moment.isDuration();
 moment.isDuration(new Date());
 moment.isDuration(moment.duration());
 
+moment().isBetween(moment(), moment());
+moment().isBetween(new Date(), new Date());
+moment().isBetween([1,1,2000], [1,1,2001], "year");
+
 moment.localeData('fr');
 moment(1316116057189).fromNow();
 
@@ -228,6 +235,8 @@ moment.duration(500).seconds();
 moment.duration(500).asSeconds();
 moment.duration().minutes();
 moment.duration().asMinutes();
+moment.duration().toISOString();
+moment.duration().toJSON();
 
 var adur = moment.duration(3, 'd');
 var bdur = moment.duration(2, 'd');