diff --git a/test/VButton.spec.ts b/test/VButton.spec.ts
index 425b83c..2f6208c 100644
--- a/test/VButton.spec.ts
+++ b/test/VButton.spec.ts
@@ -92,4 +92,45 @@ describe('VButton', () => {
     // check that the onClck function hasn't been called
     expect(onClick).not.toHaveBeenCalled()
   })
+
+  test('small button', () => {
+    const wrapper = mount(VButton, {
+      props: {
+        title: 'button',
+        label: 'label',
+        size: 'sm'
+      }
+    })
+    const button = wrapper.find('button')
+    expect(button.classes()).toContain('p-button-sm')
+    expect(button.classes()).not.toContain('p-button-lg')
+    expect(button.classes().some(c => c.includes('text-body-SM'))).toBe(true)
+  })
+
+  test('large button', () => {
+    const wrapper = mount(VButton, {
+      props: {
+        title: 'button',
+        label: 'label',
+        size: 'lg'
+      }
+    })
+    const button = wrapper.find('button')
+    expect(button.classes()).toContain('p-button-lg')
+    expect(button.classes()).not.toContain('p-button-sm')
+    expect(button.classes().some(c => c.includes('text-body-LG'))).toBe(true)
+  })
+
+  test('medium button', () => {
+    const wrapper = mount(VButton, {
+      props: {
+        title: 'button',
+        label: 'label',
+      }
+    })
+    const button = wrapper.find('button')
+    expect(button.classes()).not.toContain('p-button-lg')
+    expect(button.classes()).not.toContain('p-button-sm')
+    expect(button.classes().some(c => c.includes('text-body-MD'))).toBe(true)
+  })
 })