- Testing: Switch to Cypress with code coverage

- npm: Add peerDeps

cypress/integration/ui.js

@@ -0,0 +1,50 @@
+import {
+  approveStorage, openMainMenu,
+  openEditorPreferences
+} from '../support/ui-test-helper.js';
+
+describe('UI tests', function () {
+  beforeEach(() => {
+    cy.visit('/editor/svg-editor.html');
+    // Ensure we test against English regardless of the original locale
+    approveStorage();
+    openEditorPreferences();
+    cy.get('#lang_select').select('en');
+    cy.get('#tool_prefs_save').click();
+  });
+
+  it('Editor - No parameters: Has export button', () => {
+    openMainMenu();
+    cy.get('#tool_export');
+  });
+
+  it('Editor - No parameters: Export button clicking; dialog opens', () => {
+    openMainMenu();
+    cy.get('#tool_export').click();
+    cy.get('#dialog_content select');
+  });
+
+  it('Editor - No parameters: Drag control point of arc path', () => {
+    const randomOffset = () => 2 + Math.round(10 + Math.random() * 40);
+    cy.get('#tool_source').click();
+
+    cy.get('#svg_source_textarea')
+      .type(`<svg width="640" height="480" xmlns="http://www.w3.org/2000/svg">
+   <g class="layer">
+    <title>Layer 1</title>
+    <path d="m187,194a114,62 0 1 0 219,2" fill="#FF0000" stroke="#000000" stroke-width="5"/>
+   </g>
+  </svg>`);
+    cy.get('#tool_source_save').click();
+    cy.get('#svg_1').click().click();
+
+    cy.get('#pathpointgrip_0').trigger('mousedown', {which: 1})
+      .trigger('mousemove', randomOffset(), randomOffset())
+      .trigger('mouseup', {force: true});
+    cy.get('#pathpointgrip_1').trigger('mousedown', {which: 1})
+      .trigger('mousemove', randomOffset(), randomOffset())
+      .trigger('mouseup', {force: true});
+
+    cy.get('#svg_1[d]').should('not.contain', 'NaN');
+  });
+});