diff --git a/ix.js/ix-tests.ts b/ix.js/ix-tests.ts
index dc44f1589b..6953621ca3 100644
--- a/ix.js/ix-tests.ts
+++ b/ix.js/ix-tests.ts
@@ -1,6 +1,7 @@
 ///<reference path="ix.d.ts"/>
 
 var ec_ns = (a: number, b: string) => a.toString() == b;	//equality comparer on number,string
+var ec_ss = (a: string, b: string) => a == b;				//equality comparer on string,string
 var ec_nn = (a: number, b: number) => a === b;				//equality comparer on number,number
 var c_nn = (a: number, b: number) => a - b;					//comparer on number,number
 
@@ -44,3 +45,72 @@ Ix.Enumerable.switchCase(() => "42", { "42": ax });
 
 Ix.Enumerable.for(ax, a => ax);
 Ix.Enumerable.forIn(ax, a => ax);
+
+// instance
+
+var bx: Ix.Enumerable<string>;
+
+ax.isEmpty();
+
+bx.minBy(b => b.length, c_nn);
+bx.minBy(b => b.length);
+bx.maxBy(b => b.length, c_nn);
+bx.maxBy(b => b.length);
+
+ax.share(ax => bx);
+ax.share();
+
+ax.publish(ax => bx);
+ax.publish();
+
+ax.memoize();
+
+ax.do({ onNext: (a: number) => console.log(a), onError: err => console.log(err), onCompleted: () => console.log("completed") });
+ax.do(a => console.log(a), err => console.log(err), () => console.log("completed"));
+ax.do(a => console.log(a), err => console.log(err));
+ax.do((a: number) => console.log(a));
+ax.doAction({ onNext: (a: number) => console.log(a), onError: err => console.log(err), onCompleted: () => console.log("completed") });
+ax.doAction(a => console.log(a), err => console.log(err), () => console.log("completed"));
+ax.doAction(a => console.log(a), err => console.log(err));
+ax.doAction((a: number) => console.log(a));
+
+ax.bufferWithCount(10, 20);
+ax.bufferWithCount(10);
+
+ax.ignoreElements();
+
+bx.distinctBy(b => b.length, ec_nn);
+bx.distinctBy(b => b.length);
+
+bx.distinctUntilChanged(b => b.length, ec_nn);
+bx.distinctUntilChanged(b => b.length);
+bx.distinctUntilChanged();
+bx.distinctUntilChanged(false, ec_ss);
+
+ax.expand(a => ax);
+
+ax.startWith(10, 20);
+
+ax.scan(0, (acc, a) => acc + a);
+ax.scan((acc, a) => acc + a);
+
+ax.takeLast(10);
+ax.skipLast(10);
+
+ax.repeat(10);
+ax.repeat();
+
+ax.catch(ax, ax, ax);
+ax.catchException(ax, ax, ax);
+ax.catch(ax);
+ax.catchException(ax);
+ax.catch(err => ax);
+ax.catchException(err => ax);
+
+ax.finally(() => { });
+ax.finallyDo(() => { });
+
+ax.onErrorResumeNext(ax);
+
+ax.retry(10);
+ax.retry();
diff --git a/ix.js/ix.d.ts b/ix.js/ix.d.ts
index d138b007d5..614a950fbe 100644
--- a/ix.js/ix.d.ts
+++ b/ix.js/ix.d.ts
@@ -67,7 +67,7 @@ declare module Ix {
 		finally(finallyAction: () => void): Enumerable<T>;
 		finallyDo(finallyAction: () => void): Enumerable<T>;
 
-		onErrorResumeNext<T>(second: Enumerable<T>): Enumerable<T>;
+		onErrorResumeNext(second: Enumerable<T>): Enumerable<T>;
 
 		retry(retryCount?: number): Enumerable<T>;
 	}