Migrate backends_receive_render_context_via_stdin to BookTest

tests/alternative_backends.rs

@@ -4,37 +4,7 @@ use mdbook::config::Config;
 use mdbook::MDBook;
 use std::fs;
 use std::path::Path;
-use tempfile::{Builder as TempFileBuilder, TempDir};
-
-#[test]
-fn backends_receive_render_context_via_stdin() {
-    use mdbook::renderer::RenderContext;
-    use std::fs::File;
-
-    let (md, temp) = dummy_book_with_backend("cat-to-file", "renderers/myrenderer", false);
-
-    let renderers = temp.path().join("renderers");
-    fs::create_dir(&renderers).unwrap();
-    rust_exe(
-        &renderers,
-        "myrenderer",
-        r#"fn main() {
-            use std::io::Read;
-            let mut s = String::new();
-            std::io::stdin().read_to_string(&mut s).unwrap();
-            std::fs::write("out.txt", s).unwrap();
-        }"#,
-    );
-
-    let out_file = temp.path().join("book/out.txt");
-
-    assert!(!out_file.exists());
-    md.build().unwrap();
-    assert!(out_file.exists());
-
-    let got = RenderContext::from_json(File::open(&out_file).unwrap());
-    assert!(got.is_ok());
-}
+use tempfile::Builder as TempFileBuilder;
 
 #[test]
 fn relative_command_path() {
@@ -75,30 +45,6 @@ fn relative_command_path() {
     do_test("renderers/myrenderer");
 }
 
-fn dummy_book_with_backend(
-    name: &str,
-    command: &str,
-    backend_is_optional: bool,
-) -> (MDBook, TempDir) {
-    let temp = TempFileBuilder::new().prefix("mdbook").tempdir().unwrap();
-
-    let mut config = Config::default();
-    config
-        .set(format!("output.{name}.command"), command)
-        .unwrap();
-
-    if backend_is_optional {
-        config.set(format!("output.{name}.optional"), true).unwrap();
-    }
-
-    let md = MDBook::init(temp.path())
-        .with_config(config)
-        .build()
-        .unwrap();
-
-    (md, temp)
-}
-
 fn rust_exe(temp: &Path, name: &str, src: &str) {
     let rs = temp.join(name).with_extension("rs");
     fs::write(&rs, src).unwrap();

tests/testsuite/renderer.rs

@@ -3,6 +3,8 @@
 use crate::prelude::*;
 use mdbook::errors::Result;
 use mdbook::renderer::{RenderContext, Renderer};
+use snapbox::IntoData;
+use std::fs::File;
 use std::sync::{Arc, Mutex};
 
 struct Spy(Arc<Mutex<Inner>>);
@@ -136,3 +138,73 @@ Hello World!
 "#]]);
         });
 }
+
+// Checks the render context received by the renderer.
+#[test]
+fn backends_receive_render_context_via_stdin() {
+    let mut test = BookTest::from_dir("renderer/backends_receive_render_context_via_stdin");
+    test.rust_program(
+        "cat-to-file",
+        r#"
+        fn main() {
+            use std::io::Read;
+            let mut s = String::new();
+            std::io::stdin().read_to_string(&mut s).unwrap();
+            std::fs::write("out.txt", s).unwrap();
+        }
+        "#,
+    )
+    .run("build", |cmd| {
+        cmd.expect_stdout(str![[""]]).expect_stderr(str![[r#"
+[TIMESTAMP] [INFO] (mdbook::book): Book building has started
+[TIMESTAMP] [INFO] (mdbook::book): Running the cat-to-file backend
+[TIMESTAMP] [INFO] (mdbook::renderer): Invoking the "cat-to-file" renderer
+
+"#]]);
+    })
+    .check_file(
+        "book/out.txt",
+        str![[r##"
+{
+  "book": {
+    "__non_exhaustive": null,
+    "sections": [
+      {
+        "Chapter": {
+          "content": "# Chapter 1\n",
+          "name": "Chapter 1",
+          "number": [
+            1
+          ],
+          "parent_names": [],
+          "path": "chapter_1.md",
+          "source_path": "chapter_1.md",
+          "sub_items": []
+        }
+      }
+    ]
+  },
+  "config": {
+    "book": {
+      "authors": [],
+      "language": "en",
+      "src": "src"
+    },
+    "output": {
+      "cat-to-file": {
+        "command": "./cat-to-file"
+      }
+    }
+  },
+  "destination": "[ROOT]/book",
+  "root": "[ROOT]",
+  "version": "[VERSION]"
+}
+"##]]
+        .is_json(),
+    );
+
+    // Can round-trip.
+    let f = File::open(test.dir.join("book/out.txt")).unwrap();
+    RenderContext::from_json(f).unwrap();
+}

tests/testsuite/renderer/backends_receive_render_context_via_stdin/book.toml

@@ -0,0 +1,3 @@
+[output.cat-to-file]
+command = "./cat-to-file"
+

tests/testsuite/renderer/backends_receive_render_context_via_stdin/src/SUMMARY.md

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

tests/testsuite/renderer/backends_receive_render_context_via_stdin/src/chapter_1.md

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