Solution

src/arrayReverse.test.js

@@ -7,12 +7,45 @@ describe(`Function 'arrayReverse':`, () => {
     expect(arrayReverse).toBeInstanceOf(Function);
   });
 
-  it(`should return an array`, () => {});
+  it(`should return an array`, () => {
+    const input = ['Hello', 'World'];
+
+    expect(Array.isArray(arrayReverse(input))).toBe(true);
+  });
 
   it(`should return an empty string
     if original array consists of an empty string`, () => {
-    expect(arrayReverse(['Mate', 'Academy'])).toEqual(['ymed', 'acAetaM']);
+    expect(arrayReverse([''])).toEqual(['']);
+  });
+
+  test('reverses characters and preserves original length', () => {
+    const input = ['I', 'am', 'a', 'student!'];
+
+    expect(arrayReverse(input)).toEqual(['!', 'tn', 'e', 'dutsamaI']);
+  });
+
+  test(`reverses one string with a digit
+    and a special character as well`, () => {
+    const input = ['Hell0!'];
+
+    expect(arrayReverse(input)).toEqual(['!0lleH']);
   });
 
-  // write more tests here
+  test('reverses an empty string', () => {
+    const input = [''];
+
+    expect(arrayReverse(input)).toEqual(['']);
+  });
+
+  test('reverses an array with mixed empty and non-empty strings', () => {
+    const input = ['koteł', '', 'pieseł'];
+
+    expect(arrayReverse(input)).toEqual(['łesei', '', 'płetok']);
+  });
+
+  test('handles an empty array', () => {
+    const input = [];
+
+    expect(arrayReverse(input)).toEqual([]);
+  });
 });