fix: add test for an empty section

tools/challenge-md-parser/__snapshots__/text-to-data.test.js.snap

@@ -12,8 +12,6 @@ Object {
 <p><pre><code class=\\"language-html\\">&#x3C;p>We aim to preserve this&#x3C;/p>
 </code></pre></p>
 </section>",
-  "instructions": "<section id=\\"instructions\\">
+  "instructions": "",
-<p>To pass the test on this challenge, change your <code>h1</code> element's text to say \\"Hello World\\".</p>
-</section>",
 }
 `;

tools/challenge-md-parser/fixtures/challenge-html-ast.json

@@ -397,80 +397,6 @@
           "type": "text",
           "value": "\n"
         },
-        {
-          "type": "element",
-          "tagName": "p",
-          "properties": {},
-          "children": [
-            {
-              "type": "text",
-              "value": "To pass the test on this challenge, change your ",
-              "position": {
-                "start": {
-                  "line": 27,
-                  "column": 1,
-                  "offset": 489
-                },
-                "end": {
-                  "line": 27,
-                  "column": 49,
-                  "offset": 537
-                }
-              }
-            },
-            {
-              "type": "element",
-              "tagName": "code",
-              "properties": {},
-              "children": [
-                {
-                  "type": "text",
-                  "value": "h1"
-                }
-              ],
-              "position": {
-                "start": {
-                  "line": 27,
-                  "column": 49,
-                  "offset": 537
-                },
-                "end": {
-                  "line": 27,
-                  "column": 53,
-                  "offset": 541
-                }
-              }
-            },
-            {
-              "type": "text",
-              "value": " element's text to say \"Hello World\".",
-              "position": {
-                "start": {
-                  "line": 27,
-                  "column": 53,
-                  "offset": 541
-                },
-                "end": {
-                  "line": 27,
-                  "column": 90,
-                  "offset": 578
-                }
-              }
-            }
-          ],
-          "position": {
-            "start": {
-              "line": 27,
-              "column": 1,
-              "offset": 489
-            },
-            "end": {
-              "line": 27,
-              "column": 90,
-              "offset": 578
-            }
-          }
-        },
         {
           "type": "text",
           "value": "\n"

tools/challenge-md-parser/text-to-data.test.js

@@ -54,6 +54,13 @@ describe('text-to-data', () => {
     expect(file.data[expectedField].includes(expectedText)).toBe(true);
   });
 
+  // eslint-disable-next-line max-len
+  it('should add an empty string relating to the section id without data to `file.data`', () => {
+    const plugin = textToData([otherExpectedField]);
+    plugin(mockAST, file);
+    expect(file.data[otherExpectedField]).toEqual('');
+  });
+
   it('should preserve nested html', () => {
     const plugin = textToData([expectedField]);
     plugin(mockAST, file);