move everything around, add more content and a first test for images

docs/src/demos/Marks/Underline/index.spec.js

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+context('/api/marks/underline', () => {
+  before(() => {
+    cy.visit('/api/marks/underline')
+  })
+
+  beforeEach(() => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p>Example Text</p>')
+      editor.selectAll()
+    })
+  })
+
+  it('should parse u tags correctly', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p><u>Example Text</u></p>')
+      expect(editor.getHTML()).to.eq('<p><u>Example Text</u></p>')
+    })
+  })
+
+  it('should transform any tag with text decoration underline to u tags', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p><span style="text-decoration: underline">Example Text</span></p>')
+      expect(editor.getHTML()).to.eq('<p><u>Example Text</u></p>')
+    })
+  })
+
+  it('the button should underline the selected text', () => {
+    cy.get('.demo__preview button:first')
+      .click()
+
+    cy.get('.ProseMirror')
+      .find('u')
+      .should('contain', 'Example Text')
+  })
+
+  it('the button should toggle the selected text underline', () => {
+    cy.get('.demo__preview button:first')
+      .click()
+
+    cy.get('.ProseMirror')
+      .type('{selectall}')
+
+    cy.get('.demo__preview button:first')
+      .click()
+
+    cy.get('.ProseMirror')
+      .find('u')
+      .should('not.exist')
+  })
+
+  it('the keyboard shortcut should underline the selected text', () => {
+    cy.get('.ProseMirror')
+      .trigger('keydown', { modKey: true, key: 'u' })
+      .find('u')
+      .should('contain', 'Example Text')
+  })
+
+  it('the keyboard shortcut should toggle the selected text underline', () => {
+    cy.get('.ProseMirror')
+      .trigger('keydown', { modKey: true, key: 'u' })
+      .trigger('keydown', { modKey: true, key: 'u' })
+      .find('u')
+      .should('not.exist')
+  })
+})