From 609c0930b9a4ebe5d9264eb980e9b63f7b3706f1 Mon Sep 17 00:00:00 2001
From: eunjae-lee <karis612@gmail.com>
Date: Wed, 16 Dec 2020 17:06:22 +0100
Subject: [PATCH] fix: warn about unknown function name

---
 lib/__tests__/_getFunctionalInterface.test.ts | 20 +++++++++++++++++++
 lib/_getFunctionalInterface.ts                |  2 ++
 2 files changed, 22 insertions(+)
 create mode 100644 lib/__tests__/_getFunctionalInterface.test.ts

diff --git a/lib/__tests__/_getFunctionalInterface.test.ts b/lib/__tests__/_getFunctionalInterface.test.ts
new file mode 100644
index 00000000..8c8aed46
--- /dev/null
+++ b/lib/__tests__/_getFunctionalInterface.test.ts
@@ -0,0 +1,20 @@
+import AlgoliaAnalytics from "../insights";
+import { getFunctionalInterface } from "../_getFunctionalInterface";
+
+describe("_getFunctionalInterface", () => {
+  let aa;
+
+  beforeEach(() => {
+    const analyticsInstance = new AlgoliaAnalytics({ requestFn: () => {} });
+    aa = getFunctionalInterface(analyticsInstance);
+  });
+
+  it("warn about unknown function name", () => {
+    console.warn = jest.fn();
+    aa("unknown-function");
+    expect(console.warn).toHaveBeenCalledTimes(1);
+    expect(console.warn).toHaveBeenCalledWith(
+      "The method `unknown-function` doesn't exist."
+    );
+  });
+});
diff --git a/lib/_getFunctionalInterface.ts b/lib/_getFunctionalInterface.ts
index fb43dfbf..acf12353 100644
--- a/lib/_getFunctionalInterface.ts
+++ b/lib/_getFunctionalInterface.ts
@@ -5,6 +5,8 @@ export function getFunctionalInterface(instance: AlgoliaAnalytics) {
   return (functionName: string, ...functionArguments: any[]) => {
     if (functionName && isFunction((instance as any)[functionName])) {
       instance[functionName](...functionArguments);
+    } else {
+      console.warn(`The method \`${functionName}\` doesn't exist.`);
     }
   };
 }