diff --git a/tests/index.js b/tests/index.js
new file mode 100644
index 0000000..29c71f2
--- /dev/null
+++ b/tests/index.js
@@ -0,0 +1,50 @@
+const Passkit = require("..");
+
+describe("Node-Passkit-generator", function() {
+	var pass = null;
+	beforeEach(() => {
+		pass = new Passkit.Pass({
+			model: "../examples/examplePass.pass",
+			certificates: {
+				wwdr: "certs/WWDR.pem",
+				signerCert: "certs/signerCert.pem",
+				signerKey: {
+					key: "certs/signerKey.pem",
+					passphrase: "123456"
+				}
+			},
+			overrides: {}
+		});
+	});
+
+	describe("localize()", () => {
+		it("Won't apply changes without at least one parameter", () => {
+			pass.localize();
+			expect(Object.keys(pass.l10n).length).toBe(0);
+		});
+
+		it("Passing first argument not a string, won't apply changes", () => {
+			pass.localize(5);
+			expect(Object.keys(pass.l10n).length).toBe(0);
+		});
+
+		it("Not passing the second argument, will apply changes (.lproj folder inclusion)", () => {
+			pass.localize("en");
+			expect(Object.keys(pass.l10n).length).toBe(1);
+		});
+
+		it("Second argument of type different from object or undefined, won't apply changes.", () => {
+			pass.localize("en", 42);
+			expect(Object.keys(pass.l10n).length).toBe(0);
+		});
+
+		it("A second argument of type object will apply changes", () => {
+			pass.localize("it", {
+				"Test": "Prova"
+			});
+
+			expect(typeof pass.l10n["it"]).toBe("object");
+			expect(pass.l10n["it"]["Test"]).toBe("Prova");
+		});
+	});
+});