Migrate empty theme to BookTest

tests/rendered_output.rs

@@ -324,41 +324,6 @@ fn summary_with_markdown_formatting() {
     );
 }
 
-/// Ensure building fails if `[output.html].theme` points to a non-existent directory
-#[test]
-fn failure_on_missing_theme_directory() {
-    // 1. Using default theme should work
-    let temp = DummyBook::new().build().unwrap();
-    let book_toml = r#"
-        [book]
-        title = "implicit"
-        src = "src"
-        "#;
-
-    write_file(temp.path(), "book.toml", book_toml.as_bytes()).unwrap();
-    let md = MDBook::load(temp.path()).unwrap();
-    let got = md.build();
-    assert!(got.is_ok());
-
-    // 2. Pointing to a normal directory should work
-    let temp = DummyBook::new().build().unwrap();
-    let created = fs::create_dir(temp.path().join("theme-directory"));
-    assert!(created.is_ok());
-    let book_toml = r#"
-        [book]
-        title = "implicit"
-        src = "src"
-
-        [output.html]
-        theme = "./theme-directory"
-        "#;
-
-    write_file(temp.path(), "book.toml", book_toml.as_bytes()).unwrap();
-    let md = MDBook::load(temp.path()).unwrap();
-    let got = md.build();
-    assert!(got.is_ok());
-}
-
 #[test]
 fn custom_fonts() {
     // Tests to ensure custom fonts are copied as expected.

tests/testsuite/theme.rs

@@ -17,3 +17,16 @@ cmd.expect_failure()
 "#]]);
     });
 }
+
+// Checks what happens if the theme directory is empty.
+#[test]
+fn empty_theme() {
+    BookTest::from_dir("theme/empty_theme").run("build", |cmd| {
+        std::fs::create_dir(cmd.dir.join("theme")).unwrap();
+        cmd.expect_stderr(str![[r#"
+[TIMESTAMP] [INFO] (mdbook::book): Book building has started
+[TIMESTAMP] [INFO] (mdbook::book): Running the html backend
+
+"#]]);
+    });
+}

tests/testsuite/theme/empty_theme/book.toml

@@ -0,0 +1,5 @@
+[book]
+title = "empty_theme"
+
+[output.html]
+theme = "./theme"

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

@@ -0,0 +1,3 @@
+# Summary
+
+- [Chapter 1](./chapter_1.md)

tests/testsuite/theme/empty_theme/src/chapter_1.md

@@ -0,0 +1 @@
+# Chapter 1