Migrate custom fonts.css to BookTest

tests/rendered_output.rs

@@ -323,20 +323,6 @@ fn custom_fonts() {
         contents.contains("fonts/fonts.css")
     };
 
-    // Mixed with copy-fonts=true
-    // Should ignore the copy-fonts setting since the user has provided their own fonts.css.
-    let temp = TempFileBuilder::new().prefix("mdbook").tempdir().unwrap();
-    let p = temp.path();
-    MDBook::init(p).build().unwrap();
-    write_file(&p.join("theme/fonts"), "fonts.css", b"/*custom*/").unwrap();
-    write_file(&p.join("theme/fonts"), "myfont.woff", b"").unwrap();
-    MDBook::load(p).unwrap().build().unwrap();
-    assert!(has_fonts_css(p));
-    assert_eq!(
-        actual_files(&p.join("book/fonts")),
-        ["fonts.css", "myfont.woff"]
-    );
-
     // copy-fonts=false, no theme
     // This should generate a deprecation warning.
     let temp = TempFileBuilder::new().prefix("mdbook").tempdir().unwrap();

tests/testsuite/theme.rs

@@ -115,3 +115,25 @@ book/fonts/source-code-pro-v11-all-charsets-500.woff2
 "#]],
     );
 }
+
+// Custom fonts.css.
+#[test]
+fn fonts_css() {
+    BookTest::from_dir("theme/fonts_css")
+        .check_file_contains("book/index.html", "fonts/fonts.css")
+        .check_file(
+            "book/fonts/fonts.css",
+            str![[r#"
+/*custom*/
+
+"#]],
+        )
+        .check_file("book/fonts/myfont.woff", str![[""]])
+        .check_file_list(
+            "book/fonts",
+            str![[r#"
+book/fonts/fonts.css
+book/fonts/myfont.woff
+"#]],
+        );
+}

tests/testsuite/theme/fonts_css/src/SUMMARY.md

@@ -0,0 +1 @@
+- [With Fonts](index.md)

tests/testsuite/theme/fonts_css/theme/fonts/fonts.css

@@ -0,0 +1 @@
+/*custom*/