From 8c952a10c38e8ac1075cd720f52be3830c61ec48 Mon Sep 17 00:00:00 2001
From: Luke Kuzmish <lakuzmish@gmail.com>
Date: Tue, 7 Jan 2025 08:48:57 -0500
Subject: [PATCH] unstable stringify tests

---
 csv/unstable_stringify_test.ts | 61 ++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/csv/unstable_stringify_test.ts b/csv/unstable_stringify_test.ts
index 773bfec369cf..441d3da74a03 100644
--- a/csv/unstable_stringify_test.ts
+++ b/csv/unstable_stringify_test.ts
@@ -2,6 +2,7 @@
 
 import { assertEquals } from "@std/assert/equals";
 import { stringify } from "./unstable_stringify.ts";
+import { assertThrows } from "../assert/throws.ts";
 
 const CRLF = "\r\n";
 
@@ -28,4 +29,64 @@ Deno.test("(unstable) stringify", async (t) => {
       },
     },
   );
+
+  await t.step(
+    {
+      name: "options.columns is a bool",
+      fn() {
+        const options = { columns: true };
+        const data = [{ a: 1 }];
+        assertThrows(
+          // @ts-ignore: for test
+          () => stringify(data, options),
+          "Cannot stringify data as the columns option is invalid: columns must be an array or undefined",
+        );
+      },
+    },
+  );
+
+  await t.step(
+    {
+      name: "options.columns is an object",
+      fn() {
+        const options = { columns: { v: true } };
+        const data = [{ a: 1 }];
+        assertThrows(
+          // @ts-ignore: for test
+          () => stringify(data, options),
+          "Cannot stringify data as the columns option is invalid: columns must be an array or undefined",
+        );
+      },
+    },
+  );
+
+  await t.step(
+    {
+      name: "options.columns is a number",
+      fn() {
+        const options = { columns: 127 };
+        const data = [{ a: 1 }];
+        assertThrows(
+          // @ts-ignore: for test
+          () => stringify(data, options),
+          "Cannot stringify data as the columns option is invalid: columns must be an array or undefined",
+        );
+      },
+    },
+  );
+
+  await t.step(
+    {
+      name: "options.columns is a string",
+      fn() {
+        const options = { columns: "i am a string" };
+        const data = [{ a: 1 }];
+        assertThrows(
+          // @ts-ignore: for test
+          () => stringify(data, options),
+          "Cannot stringify data as the columns option is invalid: columns must be an array or undefined",
+        );
+      },
+    },
+  );
 });