tx-signing-js: js tests for GroupElement

sdk/js/src/main/scala/org/ergoplatform/sdk/js/GroupElement.scala

@@ -12,12 +12,13 @@ class GroupElement(val point: Ecp) extends js.Object {
   /** Returns the point encoded as hex string (ASN.1 encoding).
     * @see CryptoFacade.getASN1Encoding
     */
-  def toHex: String = {
+  def toHex(): String = {
     CryptoFacade.getASN1Encoding(point, true).toHex
   }
 }
 
-object GroupElement {
+@JSExportTopLevel("GroupElementObj")
+object GroupElement extends js.Object {
   /** Creates a new [[GroupElement]] from the given hex string (ASN.1 encoding)
     * representation of the underlying [[sigmastate.crypto.Platform.Point]].
     */

sigma-js/sigmastate-js.d.ts

@@ -20,6 +20,14 @@ declare module "sigmastate-js/main" {
     static fromHex(value: HexString): ErgoTree;
   }
 
+  export declare class GroupElement {
+    toHex(): HexString;
+  }
+
+  export declare class GroupElementObj {
+    static fromHex(value: HexString): GroupElement;
+  }
+
   export declare class Type {
     name: string;
     toString(): string;

sigma-js/tests/js/GroupElement.spec.js

@@ -0,0 +1,10 @@
+const { GroupElementObj, ErgoTree} = require("sigmastate-js/main");
+
+let pointAsn1Hex = "02c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee5";
+
+describe("GroupElement", () => {
+    it("should implement toHex/fromHex", () => {
+        let ge = GroupElementObj.fromHex(pointAsn1Hex)
+        expect(ge.toHex()).toEqual(pointAsn1Hex)
+    });
+});