Migrate alternate_backend_with_arguments to BookTest

tests/alternative_backends.rs

@@ -6,13 +6,6 @@ use std::fs;
 use std::path::Path;
 use tempfile::{Builder as TempFileBuilder, TempDir};
 
-#[test]
-fn alternate_backend_with_arguments() {
-    let (md, _temp) = dummy_book_with_backend("arguments", "echo Hello World!", false);
-
-    md.build().unwrap();
-}
-
 #[test]
 fn backends_receive_render_context_via_stdin() {
     use mdbook::renderer::RenderContext;

tests/testsuite/renderer.rs

@@ -105,3 +105,34 @@ fn missing_optional_not_fatal() {
 "#]]);
     });
 }
+
+// Command can include arguments.
+#[test]
+fn renderer_with_arguments() {
+    BookTest::from_dir("renderer/renderer_with_arguments")
+        .rust_program(
+            "arguments",
+            r#"
+            fn main() {
+                let args: Vec<_> = std::env::args().skip(1).collect();
+                assert_eq!(args, &["arg1", "arg2"]);
+                println!("Hello World!");
+                use std::io::Read;
+                let mut s = String::new();
+                std::io::stdin().read_to_string(&mut s).unwrap();
+            }
+            "#,
+        )
+        .run("build", |cmd| {
+            cmd.expect_stdout(str![[r#"
+Hello World!
+
+"#]])
+                .expect_stderr(str![[r#"
+[TIMESTAMP] [INFO] (mdbook::book): Book building has started
+[TIMESTAMP] [INFO] (mdbook::book): Running the arguments backend
+[TIMESTAMP] [INFO] (mdbook::renderer): Invoking the "arguments" renderer
+
+"#]]);
+        });
+}

tests/testsuite/renderer/renderer_with_arguments/book.toml

@@ -0,0 +1,3 @@
+[output.arguments]
+command = "./arguments arg1 arg2"
+