fix: link fragment with accents should be valid if the heading exists

Fixes a regression introduced in v2.3.0, which needed to lower case/manage case insensitive heading.

src/utils.js

@@ -26,7 +26,7 @@ const convertHeadingToHTMLFragment = (inlineText) => {
           "",
         )
         .replace(/ /gu, "-"),
-    )
+    ).toLowerCase()
   )
 }
 

test/fixtures/valid/existing-heading-with-accents/awesome.md

@@ -0,0 +1,3 @@
+# Awesome
+
+## Développement

test/fixtures/valid/existing-heading-with-accents/existing-heading-with-accents.md

@@ -0,0 +1,3 @@
+# Valid
+
+[Link fragment](./awesome.md#développement)

test/index.test.js

@@ -26,80 +26,80 @@ test("ensure the rule validates correctly", async (t) => {
   await t.test("should be invalid", async (t) => {
     const testCases = [
       {
-        name: "with an empty id fragment",
+        name: "should be invalid with an empty id fragment",
         fixturePath:
           "test/fixtures/invalid/empty-id-fragment/empty-id-fragment.md",
         error: '"./awesome.md#" should have a valid fragment identifier',
       },
       {
-        name: "with a name fragment other than for an anchor",
+        name: "should be invalid with a name fragment other than for an anchor",
         fixturePath:
           "test/fixtures/invalid/ignore-name-fragment-if-not-an-anchor/ignore-name-fragment-if-not-an-anchor.md",
         error:
           '"./awesome.md#name-should-be-ignored" should have a valid fragment identifier',
       },
       {
-        name: "with a non-existing id fragment (data-id !== id)",
+        name: "should be invalid with a non-existing id fragment (data-id !== id)",
         fixturePath:
           "test/fixtures/invalid/ignore-not-an-id-fragment/ignore-not-an-id-fragment.md",
         error:
           '"./awesome.md#not-an-id-should-be-ignored" should have a valid fragment identifier',
       },
       {
-        name: "with invalid heading with #L fragment",
+        name: "should be invalid with invalid heading with #L fragment",
         fixturePath:
           "test/fixtures/invalid/invalid-heading-with-L-fragment/invalid-heading-with-L-fragment.md",
         error: '"./awesome.md#L7abc" should have a valid fragment identifier',
       },
       {
-        name: "with a invalid line number fragment",
+        name: "should be invalid with a invalid line number fragment",
         fixturePath:
           "test/fixtures/invalid/invalid-line-number-fragment/invalid-line-number-fragment.md",
         error:
           '"./awesome.md#L7" should have a valid fragment identifier, "./awesome.md#L7" should have at least 7 lines to be valid',
       },
       {
-        name: "with a non-existing anchor name fragment",
+        name: "should be invalid with a non-existing anchor name fragment",
         fixturePath:
           "test/fixtures/invalid/non-existing-anchor-name-fragment/non-existing-anchor-name-fragment.md",
         error:
           '"./awesome.md#non-existing-anchor-name-fragment" should have a valid fragment identifier',
       },
       {
-        name: "with a non-existing element id fragment",
+        name: "should be invalid with a non-existing element id fragment",
         fixturePath:
           "test/fixtures/invalid/non-existing-element-id-fragment/non-existing-element-id-fragment.md",
         error:
           '"./awesome.md#non-existing-element-id-fragment" should have a valid fragment identifier',
       },
       {
-        name: "with a non-existing heading fragment",
+        name: "should be invalid with a non-existing heading fragment",
         fixturePath:
           "test/fixtures/invalid/non-existing-heading-fragment/non-existing-heading-fragment.md",
         error:
           '"./awesome.md#non-existing-heading" should have a valid fragment identifier',
       },
       {
-        name: "with a link to an image with a empty fragment",
+        name: "should be invalid with a link to an image with a empty fragment",
         fixturePath:
           "test/fixtures/invalid/ignore-empty-fragment-checking-for-image.md",
         error:
           '"../image.png#" should not have a fragment identifier as it is an image',
       },
       {
-        name: "with a link to an image with a fragment",
+        name: "should be invalid with a link to an image with a fragment",
         fixturePath:
           "test/fixtures/invalid/ignore-fragment-checking-for-image.md",
         error:
           '"../image.png#non-existing-fragment" should not have a fragment identifier as it is an image',
       },
       {
-        name: "with a non-existing file",
+        name: "should be invalid with a non-existing file",
         fixturePath: "test/fixtures/invalid/non-existing-file.md",
         error: '"./index.test.js" should exist in the file system',
       },
       {
-        name: "with a non-existing image",
+        name: "should be invalid with a non-existing image",
         fixturePath: "test/fixtures/invalid/non-existing-image.md",
         error: '"./image.png" should exist in the file system',
       },
@@ -122,46 +122,51 @@ test("ensure the rule validates correctly", async (t) => {
   await t.test("should be valid", async (t) => {
     const testCases = [
       {
-        name: "with an existing anchor name fragment",
+        name: "should be valid with an existing anchor name fragment",
         fixturePath:
           "test/fixtures/valid/existing-anchor-name-fragment/existing-anchor-name-fragment.md",
       },
       {
-        name: "with an existing element id fragment",
+        name: "should be valid with an existing element id fragment",
         fixturePath:
           "test/fixtures/valid/existing-element-id-fragment/existing-element-id-fragment.md",
       },
       {
-        name: "with an existing heading fragment (case insensitive)",
+        name: "should be valid with an existing heading fragment (case insensitive)",
         fixturePath:
           "test/fixtures/valid/existing-heading-case-insensitive/existing-heading-case-insensitive.md",
       },
       {
-        name: "with an existing heading fragment",
+        name: "should be valid with an existing heading fragment",
         fixturePath:
           "test/fixtures/valid/existing-heading-fragment/existing-heading-fragment.md",
       },
+      {
+        name: 'should be valid with an existing heading fragment with accents (e.g: "é")',
+        fixturePath:
+          "test/fixtures/valid/existing-heading-with-accents/existing-heading-with-accents.md",
+      },
       {
         name: "should only parse markdown files for fragments checking",
         fixturePath:
           "test/fixtures/valid/only-parse-markdown-files-for-fragments/only-parse-markdown-files-for-fragments.md",
       },
       {
-        name: 'with valid heading "like" line number fragment',
+        name: 'should be valid with valid heading "like" line number fragment',
         fixturePath:
           "test/fixtures/valid/valid-heading-like-number-fragment/valid-heading-like-number-fragment.md",
       },
       {
-        name: "with valid line number fragment",
+        name: "should be valid with valid line number fragment",
         fixturePath:
           "test/fixtures/valid/valid-line-number-fragment/valid-line-number-fragment.md",
       },
       {
-        name: "with an existing file",
+        name: "should be valid with an existing file",
         fixturePath: "test/fixtures/valid/existing-file.md",
       },
       {
-        name: "with an existing image",
+        name: "should be valid with an existing image",
         fixturePath: "test/fixtures/valid/existing-image.md",
       },
       {