fix: correct Year 2 prerequisite links

src/content/docs/bachelor/year-2/project-2-1.md

@@ -23,7 +23,7 @@ The project is accompanied by so-called skills classes. These classes help stude
 
 ## Prerequisites
 
-A pass for [Project 1-1](../year-1/project-1-1/). Furthermore, a pass for at least two of the following three courses:
+A pass for [Project 1-1](../../year-1/project-1-1/). Furthermore, a pass for at least two of the following three courses:
 
 - Introduction to Computer Science 1
 - Introduction to Computer Science 2

src/content/docs/bachelor/year-2/project-2-2.md

@@ -23,7 +23,7 @@ The project is accompanied by so-called skills classes. These classes help stude
 
 ## Prerequisites
 
-A pass for [Project 1-2](../year-1/project-1-2/). Furthermore, a pass for at least two of the following three courses:
+A pass for [Project 1-2](../../year-1/project-1-2/). Furthermore, a pass for at least two of the following three courses:
 
 - Introduction to Computer Science 1
 - Introduction to Computer Science 2

tests/content-audit.test.mjs

@@ -30,3 +30,22 @@ test('Year 2 honours programme retains its awaiting-content notice', async () =>
   assert.match(content, /:::note\[Awaiting content\]/);
   assert.match(content, /This page is awaiting content\./);
 });
+
+for (const { file, correctHref, shallowHref } of [
+  {
+    file: 'src/content/docs/bachelor/year-2/project-2-1.md',
+    correctHref: '../../year-1/project-1-1/',
+    shallowHref: '../year-1/project-1-1/',
+  },
+  {
+    file: 'src/content/docs/bachelor/year-2/project-2-2.md',
+    correctHref: '../../year-1/project-1-2/',
+    shallowHref: '../year-1/project-1-2/',
+  },
+]) {
+  test(`${file} links to its Year 1 prerequisite from the nested route`, async () => {
+    const content = await readFile(file, 'utf8');
+    assert.match(content, new RegExp(`\\]\\(${correctHref.replaceAll('/', '\\/')}\\)`));
+    assert.doesNotMatch(content, new RegExp(`\\]\\(${shallowHref.replaceAll('/', '\\/')}\\)`));
+  });
+}