Added implementation for setBeacons along with some tests

spec/PKPass.ts

@@ -0,0 +1,48 @@
+import { default as PKPass } from "../lib/PKPass";
+
+describe("PKPass", () => {
+	describe("setBeacons", () => {
+		it("should reset instance.props['beacons'] if 'null' is passed as value", () => {
+			const pass = new PKPass({}, {});
+
+			pass.setBeacons({
+				proximityUUID: "0000000000-00000000",
+				major: 4,
+				minor: 3,
+				relevantText: "This is not the Kevin you are looking for.",
+			});
+
+			expect(pass.props["beacons"].length).toBe(1);
+
+			pass.setBeacons(null);
+
+			expect(pass.props["beacons"]).toBeUndefined();
+		});
+
+		it("should filter out invalid beacons objects", () => {
+			const pass = new PKPass({}, {});
+
+			/** This is invalid, major should be greater than minor */
+			pass.setBeacons(
+				{
+					proximityUUID: "0000000000-00000000",
+					major: 2,
+					minor: 3,
+					relevantText: "This is not the Kevin you are looking for.",
+				},
+				// @ts-expect-error
+				{
+					major: 2,
+					minor: 3,
+				},
+				{
+					proximityUUID: "0000000000-00000",
+					major: 2,
+					minor: 1,
+				},
+			);
+
+			expect(pass.props["beacons"].length).toBe(1);
+		});
+	});
+});