From 457b77dd485f08616bd597492cdc26ed89ae92d3 Mon Sep 17 00:00:00 2001
From: Emile Bangma <github@emilebangma.com>
Date: Sat, 22 Mar 2025 02:59:43 +0000
Subject: [PATCH] fix(frontmatter): prevent slug duplication through frontmatter (#1860)

---
 quartz/util/path.test.ts |   34 ++++++++++++++++++++++++++++++++++
 1 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/quartz/util/path.test.ts b/quartz/util/path.test.ts
index 7e9c4c8..9f94c68 100644
--- a/quartz/util/path.test.ts
+++ b/quartz/util/path.test.ts
@@ -38,6 +38,17 @@
     assert(!path.isRelativeURL("./abc/def.md"))
   })
 
+  test("isAbsoluteURL", () => {
+    assert(path.isAbsoluteURL("https://example.com"))
+    assert(path.isAbsoluteURL("http://example.com"))
+    assert(path.isAbsoluteURL("ftp://example.com/a/b/c"))
+    assert(path.isAbsoluteURL("http://host/%25"))
+    assert(path.isAbsoluteURL("file://host/twoslashes?more//slashes"))
+
+    assert(!path.isAbsoluteURL("example.com/abc/def"))
+    assert(!path.isAbsoluteURL("abc"))
+  })
+
   test("isFullSlug", () => {
     assert(path.isFullSlug("index"))
     assert(path.isFullSlug("abc/def"))
@@ -158,6 +169,29 @@
       path.isRelativeURL,
     )
   })
+
+  test("joinSegments", () => {
+    assert.strictEqual(path.joinSegments("a", "b"), "a/b")
+    assert.strictEqual(path.joinSegments("a/", "b"), "a/b")
+    assert.strictEqual(path.joinSegments("a", "b/"), "a/b/")
+    assert.strictEqual(path.joinSegments("a/", "b/"), "a/b/")
+
+    // preserve leading and trailing slashes
+    assert.strictEqual(path.joinSegments("/a", "b"), "/a/b")
+    assert.strictEqual(path.joinSegments("/a/", "b"), "/a/b")
+    assert.strictEqual(path.joinSegments("/a", "b/"), "/a/b/")
+    assert.strictEqual(path.joinSegments("/a/", "b/"), "/a/b/")
+
+    // lone slash
+    assert.strictEqual(path.joinSegments("/a/", "b", "/"), "/a/b/")
+    assert.strictEqual(path.joinSegments("a/", "b" + "/"), "a/b/")
+
+    // works with protocol specifiers
+    assert.strictEqual(path.joinSegments("https://example.com", "a"), "https://example.com/a")
+    assert.strictEqual(path.joinSegments("https://example.com/", "a"), "https://example.com/a")
+    assert.strictEqual(path.joinSegments("https://example.com", "a/"), "https://example.com/a/")
+    assert.strictEqual(path.joinSegments("https://example.com/", "a/"), "https://example.com/a/")
+  })
 })
 
 describe("link strategies", () => {

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