feat: validate link in image src

test/basic.test.js

@@ -12,13 +12,23 @@ tap.test('ensure we validate correctly', async (t) => {
     customRules: [relativeLinks]
   })
   t.equal(lintResults['test/fixtures/Valid.md'].length, 0)
-  t.equal(lintResults['test/fixtures/Invalid.md'].length, 1)
+  t.equal(lintResults['test/fixtures/Invalid.md'].length, 2)
+
   t.equal(
-    lintResults['test/fixtures/Invalid.md'][0].ruleDescription,
+    lintResults['test/fixtures/Invalid.md'][0]?.ruleDescription,
     'Relative links should be valid'
   )
   t.equal(
-    lintResults['test/fixtures/Invalid.md'][0].errorDetail,
+    lintResults['test/fixtures/Invalid.md'][0]?.errorDetail,
     'Link "./basic.test.js" is dead'
   )
+
+  t.equal(
+    lintResults['test/fixtures/Invalid.md'][1]?.ruleDescription,
+    'Relative links should be valid'
+  )
+  t.equal(
+    lintResults['test/fixtures/Invalid.md'][1]?.errorDetail,
+    'Link "../image.png" is dead'
+  )
 })

test/fixtures/Invalid.md

@@ -1,3 +1,5 @@
 # Invalid
 
 [basic.js](./basic.test.js)
+
+![Image](../image.png)

test/fixtures/Valid.md

@@ -1,3 +1,5 @@
 # Valid
 
 [basic.js](../basic.test.js)
+
+![Image](./image.png)