add italic parseDOM tests

docs/src/demos/Extensions/Italic/index.spec.js

@@ -10,6 +10,27 @@ context('/api/extensions/italic', () => {
     })
   })
 
+  it('i tags should be transformed to em tags', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p><i>Example Text</i></p>')
+      expect(editor.html()).to.eq('<p><em>Example Text</em></p>')
+    })
+  })
+
+  it('i tags with normal font style should be omitted', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p><i style="font-style: normal">Example Text</i></p>')
+      expect(editor.html()).to.eq('<p>Example Text</p>')
+    })
+  })
+
+  it('generic tags with italic style should be transformed to strong tags', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p><span style="font-style: italic">Example Text</span></p>')
+      expect(editor.html()).to.eq('<p><em>Example Text</em></p>')
+    })
+  })
+
   it('the button should make the selected text italic', () => {
     cy.get('.demo__preview button:first')
       .click()