[test] round trip tests for doctype and xml declaration

packages/prosemirror-lwdita-demo/cypress/e2e/round-trip.cy.ts

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+/*!
+Copyright (C) 2020 Evolved Binary
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+describe('Round Trip', () => {
+    it('should be able to round trip a document', () => {
+        // set up the entry xdita
+        const mockXML = `<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE topic PUBLIC "-//OASIS//DTD LIGHTWEIGHT DITA Topic//EN" "lw-topic.dtd">
+<topic id="petal">
+    <title>What is Petal?</title>
+</topic>
+`;
+        window.localStorage.setItem('file', mockXML);
+        cy.visit('http://localhost:1234/')
+            .get('#saveFile')
+            .click()
+            .readFile('cypress/downloads/Petal.xml')
+            // compare the output to the input
+            .should('equal', mockXML);
+    });
+
+    it('should be able to round trip a document without doctype header', () => {
+        // set up the entry xdita
+        const mockXML = `
+<topic id="petal">
+    <title>What is Petal?</title>
+</topic>
+`;
+        // set up the default doctype header
+        const doctype = `<?xml version="1.0" encoding="UTF-8"?>\n<!DOCTYPE topic PUBLIC "-//OASIS//DTD LIGHTWEIGHT DITA Topic//EN" "lw-topic.dtd">`;
+        window.localStorage.setItem('file', mockXML);
+        cy.visit('http://localhost:1234/')
+            .get('#saveFile')
+            .click()
+            .readFile('cypress/downloads/Petal.xml')
+            // compare the output to the input
+            .should('equal', doctype + mockXML);
+    });
+
+    it('should be able to round trip a document with a custom doctype header', () => {
+        // set up the entry xdita
+        const mockXML = `<?xml version="1.4" encoding="UTF-8"?>
+<!DOCTYPE topic PUBLIC "-//OASIS//DTD Custom DITA Topic//EN" "custom.dtd">
+<topic id="petal">
+    <title>What is Petal?</title>
+</topic>
+`;
+        // set up the default doctype header
+        window.localStorage.setItem('file', mockXML);
+        cy.visit('http://localhost:1234/')
+            .get('#saveFile')
+            .click()
+            .readFile('cypress/downloads/Petal.xml')
+            // compare the output to the input
+            .should('equal', mockXML);
+    });
+});