diff --git a/src/shared/utils/tests.spec.ts b/src/shared/utils/tests.spec.ts
new file mode 100644
index 00000000..f75c6e11
--- /dev/null
+++ b/src/shared/utils/tests.spec.ts
@@ -0,0 +1,125 @@
+/* eslint-disable max-lines-per-function */
+import BaseElement from './baseElement.ts';
+import createBaseElement from './createBaseElement.ts';
+import createSVGUse from './createSVGUse.ts';
+import { isNotNullable, isNullable } from './isNullable.ts';
+
+const baseElement = new BaseElement(
+  'a',
+  ['first', 'second'],
+  {
+    'data-test': 'test',
+    href: 'test',
+  },
+  'someText',
+);
+
+const elem = createBaseElement({
+  attributes: {
+    'data-test': 'test',
+  },
+  cssClasses: ['test'],
+  innerContent: 'test',
+  tag: 'div',
+});
+
+describe('Checking createBaseElement function', () => {
+  it('should create an element', () => {
+    expect(elem).toBeDefined();
+  });
+
+  it('should create an element with attributes', () => {
+    expect(elem.dataset.test).toBe('test');
+  });
+
+  it('should create an element with css classes', () => {
+    expect(elem.classList.contains('test')).toBe(true);
+  });
+});
+
+describe('Checking isNullable function', () => {
+  it('should return true', () => {
+    expect(isNullable(null)).toBe(true);
+  });
+  it('should return false', () => {
+    expect(isNullable('test')).toBe(false);
+  });
+});
+
+describe('Checking isNotNullable function', () => {
+  it('should return true', () => {
+    expect(isNotNullable(null)).toBe(false);
+  });
+  it('should return false', () => {
+    expect(isNotNullable('test')).toBe(true);
+  });
+});
+
+describe('Checking createSVGUse function', () => {
+  it('should create an element', () => {
+    expect(createSVGUse('test')).toBeDefined();
+  });
+});
+
+describe('Checking BaseElement class', () => {
+  it('should add css class to the element and return true', () => {
+    baseElement.addCssClass('third');
+    expect(baseElement.getNode().classList.contains('third')).toBe(true);
+  });
+
+  it('should remove css class from the element and return true', () => {
+    baseElement.removeCssClass('first');
+    expect(baseElement.getNode().classList.contains('first')).toBe(false);
+  });
+
+  it('should toggle css class from the element and return true', () => {
+    baseElement.toggleCssClass('first');
+    expect(baseElement.getNode().classList.contains('first')).toBe(true);
+  });
+
+  it('remove should return true', () => {
+    baseElement.remove();
+    expect(baseElement.getNode().parentElement).toBe(null);
+  });
+
+  it('append children should return true', () => {
+    baseElement.append(elem);
+    expect(baseElement.getNode().contains(elem)).toBe(true);
+  });
+
+  it('replace children should return true', () => {
+    baseElement.replaceChildren(elem);
+    expect(baseElement.getNode().contains(elem)).toBe(true);
+  });
+
+  it('add event listener should return true', () => {
+    baseElement.addListener('click', () => {});
+    const addEventListenerSpy = vi.spyOn(baseElement.getNode(), 'addEventListener');
+    expect(addEventListenerSpy).toBeInstanceOf(Function);
+  });
+
+  it('remove event listener should return true', () => {
+    baseElement.removeListener('click', () => {});
+    const removeEventListenerSpy = vi.spyOn(baseElement.getNode(), 'removeEventListener');
+    expect(removeEventListenerSpy).toBeInstanceOf(Function);
+  });
+
+  it('get attribute should return true', () => {
+    const attribute = baseElement.getAttribute('data-test');
+    expect(attribute).toBe('test');
+  });
+
+  it('set attributes should return true', () => {
+    baseElement.setAttributes({
+      'data-test1': 'test1',
+      'data-test2': 'test2',
+    });
+    expect(baseElement.getNode().dataset.test1).toBe('test1');
+    expect(baseElement.getNode().dataset.test2).toBe('test2');
+  });
+
+  it('inner text is equal to test2', () => {
+    baseElement.setTextContent('test2');
+    expect(baseElement.getNode().innerText).toBe('test2');
+  });
+});