Initial tests for isFile and isFileList

test/isFile.spec.ts

@@ -0,0 +1,49 @@
+import { assert } from 'chai';
+import { isFile } from '../src/index.js';
+
+describe('test isFile', function () {
+    /* it('test isFile', function (done) {
+        assert.equal(isFile('test'), false);
+        assert.equal(isFile(new File([''], 'test')), true);
+        assert.equal(isFile({}), false);
+        assert.equal(isFile(1), false);
+        assert.equal(isFile(true), false);
+        assert.equal(isFile(null), false);
+        assert.equal(isFile(undefined), false);
+        done();
+    }) */
+    it('should return false for a string', function (done) {
+        assert.equal(isFile('test'), false);
+        done();
+      });
+
+      it('should return true for a File object', function (done) {
+        assert.equal(isFile(new File([''], 'test')), true);
+        done();
+      });
+
+      it('should return false for an empty object', function (done) {
+        assert.equal(isFile({}), false);
+        done();
+      });
+
+      it('should return false for a number', function (done) {
+        assert.equal(isFile(1), false);
+        done();
+      });
+
+      it('should return false for a boolean', function (done) {
+        assert.equal(isFile(true), false);
+        done();
+      });
+
+      it('should return false for null', function (done) {
+        assert.equal(isFile(null), false);
+        done();
+      });
+
+      it('should return false for undefined', function (done) {
+        assert.equal(isFile(undefined), false);
+        done();
+      });
+})

test/isFileList.spec.ts

@@ -0,0 +1,49 @@
+import { assert } from 'chai';
+import { describe, it } from 'mocha';
+import { isFileList } from '../src/index.js';
+
+class MockFileList {
+    length: number;
+    item: (index: number) => File;
+
+    constructor(files: File[]) {
+        this.length = files.length;
+        this.item = (index: number) => files[index];
+    }
+
+    [Symbol.iterator]() {
+        let index = 0;
+        const files = this.item;
+        return {
+            next(): IteratorResult<File> {
+                if (index < files.length) {
+                    return { value: files(index++), done: false };
+                } else {
+                    return { value: null, done: true };
+                }
+            }
+        }
+    }
+}
+
+
+
+describe('test isFileList', function () {
+    // @ts-ignore
+    global.FileList = MockFileList;
+    let fileList = new MockFileList(Array<File>(new File([''], 'test')));
+    it('should not throw for FileList', function (done) {
+        assert.doesNotThrow(() => isFileList(fileList))
+        done();
+    })
+    it('should throw for {}', function (done) {
+        assert.throws(function () {
+            isFileList({});
+        });
+        done();
+    })
+
+    after(() => {
+        Reflect.deleteProperty(global, 'FileList')
+    })
+})