Fix out of order embedding of files

- added double quote as attribute marker
- fixed inject order of embedded files
- added e2e test covering order of embedded files

Signed-off-by: Martin Mihálek <aenniw@gmail.com>

Author: aenniw

cypress/integration/sidebar/config.spec.js

@@ -326,6 +326,7 @@ context('sidebar.configurations', () => {
   const embedFilesIds = [
     'embedded-file-type',
     'embedded-code-fragments',
+    'embedded-file-order',
     'tag-attribute',
     'the-code-block-highlight',
   ];
@@ -336,7 +337,7 @@ context('sidebar.configurations', () => {
       cy.get(`a.section-link[href='#/embed-files?id=${id}']`)
         .click()
         .then(() => {
-          cy.wait(500);
+          cy.wait(750);
           cy.matchImageSnapshot();
         });
     });

cypress/live.server.js

@@ -7,7 +7,16 @@ console.log('[e2e tests] : args passed to live server', args)
 const params = {
   port: args[0] || 3000,
   root: args[1] || fixturePath,
-  open: false
+  open: false,
+  middleware: [
+    function(req, res, next) {
+      if (req.url === '/_media/delayed.md') {
+        setTimeout(next, 3000);
+      } else {
+        next();
+      }
+    },
+  ],
   // NoBrowser: true
-}
-LiveServer.start(params)
+};
+LiveServer.start(params)

cypress/snapshots/sidebar/config.spec.js/sidebar.configurations -- go to #embed-filesid=embedded-code-fragments.snap.png

@@ -26,9 +26,8 @@
 
 import { addMatchImageSnapshotCommand } from 'cypress-image-snapshot/command'
 addMatchImageSnapshotCommand({
-  failureThreshold: 10.0,
+  failureThreshold: 0.10,
   failureThresholdType: 'percent',
-  customDiffConfig: { threshold: 10.0 },
   capture: 'viewport',
   timeout: '60000'
 })

cypress/snapshots/sidebar/config.spec.js/sidebar.configurations -- go to #embed-filesid=embedded-file-order.snap.png

@@ -0,0 +1,7 @@
+- This is from the `delayed.md`
+
+```bash
+sleep 1000
+echo delayed
+exit 0
+```

cypress/snapshots/sidebar/config.spec.js/sidebar.configurations -- go to #embed-filesid=embedded-file-type.snap.png

@@ -0,0 +1,7 @@
+- This is from the `no-delay.md`
+
+```bash
+sleep 0 
+echo non-delayed
+exit 0
+```