Add a test to make sure isFileLike returns false for Blob

Author: octet-stream

lib/util/isFile.test.ts

@@ -0,0 +1,75 @@
+import test from "ava"
+
+import {File, Blob} from "formdata-node"
+
+import {FileLike} from "../FileLike"
+
+import isFile from "./isFile"
+
+test("Returns true for a File", t => {
+  const file = new File(["Content"], "name.txt")
+
+  t.true(isFile(file))
+})
+
+test("Returns true for a class that implements File", t => {
+  class MyFile implements FileLike {
+    name = ""
+
+    type = ""
+
+    size = 0
+
+    lastModified = Date.now()
+
+    async* stream(): AsyncGenerator<Uint8Array> {
+      yield new Uint8Array(0)
+    }
+
+    get [Symbol.toStringTag](): string {
+      return "File"
+    }
+  }
+
+  t.true(isFile(new MyFile()))
+})
+
+test("Returns true for a file-shaped object", t => {
+  const object = {
+    name: "",
+
+    type: "",
+
+    size: 0,
+
+    lastModified: Date.now(),
+
+    async* stream(): AsyncGenerator<Uint8Array> {
+      yield new Uint8Array(0)
+    },
+
+    get [Symbol.toStringTag](): string {
+      return "File"
+    }
+  }
+
+  t.true(isFile(object))
+})
+
+test("Returns false for null", t => {
+  t.false(isFile(null))
+})
+
+test("Returns false for undefined", t => {
+  t.false(isFile(undefined))
+})
+
+test("Returns false for non-File object", t => {
+  t.false(isFile(new Map()))
+})
+
+test("Returns false for Blob", t => {
+  const blob = new Blob(["Content"], {type: "text/plain"})
+
+  t.false(isFile(blob))
+})