Migrate build_the_dummy_book to BookTest (build::basic_build)

This doesn't exercise *everything* that the old test did, but other
tests will take care of those gaps. This is intended as just a smoke
test.

tests/rendered_output.rs

@@ -40,15 +40,6 @@ const TOC_SECOND_LEVEL: &[&str] = &[
     "2.1. Nested Chapter",
 ];
 
-/// Make sure you can load the dummy book and build it without panicking.
-#[test]
-fn build_the_dummy_book() {
-    let temp = DummyBook::new().build().unwrap();
-    let md = MDBook::load(temp.path()).unwrap();
-
-    md.build().unwrap();
-}
-
 #[test]
 fn by_default_mdbook_generates_rendered_content_in_the_book_directory() {
     let temp = DummyBook::new().build().unwrap();

tests/testsuite/build.rs

@@ -0,0 +1,18 @@
+//! General build tests.
+//!
+//! More specific tests should usually go into a module based on the feature.
+//! This module should just have general build tests, or misc small things.
+
+use crate::prelude::*;
+
+// Simple smoke test that building works.
+#[test]
+fn basic_build() {
+    BookTest::from_dir("build/basic_build").run("build", |cmd| {
+        cmd.expect_stderr(str![[r#"
+[TIMESTAMP] [INFO] (mdbook::book): Book building has started
+[TIMESTAMP] [INFO] (mdbook::book): Running the html backend
+
+"#]]);
+    });
+}

tests/testsuite/build/basic_build/book.toml

@@ -0,0 +1,2 @@
+[book]
+title = "basic_build"

tests/testsuite/build/basic_build/src/SUMMARY.md

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

tests/testsuite/build/basic_build/src/chapter_1.md

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

tests/testsuite/main.rs

@@ -3,6 +3,7 @@
 //! See README.md for documentation.
 
 mod book_test;
+mod build;
 
 mod prelude {
     pub use crate::book_test::BookTest;