Add buildtest for BuildBuilder::patch_with_path

Author: regexident

tests/buildtest/crates/path-based-patch/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "path-based-patch"
+version = "0.1.0"
+authors = ["Pietro Albini <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+empty-library = "1.0.0"

tests/buildtest/crates/path-based-patch/patch/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "empty-library"
+version = "1.0.1"
+authors = ["Pietro Albini <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

tests/buildtest/crates/path-based-patch/patch/src/lib.rs

@@ -0,0 +1,3 @@
+pub fn dummy() {
+    println!("This is coming from the patch!");
+}

tests/buildtest/crates/path-based-patch/src/main.rs

@@ -0,0 +1,4 @@
+fn main() {
+    println!("Hello, world!");
+    empty_library::dummy();
+}

tests/buildtest/mod.rs

@@ -26,6 +26,30 @@ fn test_hello_world() {
     });
 }
 
+#[test]
+fn path_based_patch() {
+    runner::run("path-based-patch", |run| {
+        run.build(SandboxBuilder::new().enable_networking(false), |builder| {
+            builder
+                .patch_with_path("empty-library", "./patch")
+                .run(move |build| {
+                    let storage = rustwide::logging::LogStorage::new(LevelFilter::Info);
+                    rustwide::logging::capture(&storage, || -> Result<_, Error> {
+                        build.cargo().args(&["run"]).run()?;
+                        Ok(())
+                    })?;
+
+                    assert!(storage.to_string().contains("[stdout] Hello, world!\n"));
+                    assert!(storage
+                        .to_string()
+                        .contains("[stdout] This is coming from the patch!\n"));
+                    Ok(())
+                })
+        })?;
+        Ok(())
+    });
+}
+
 #[test]
 fn test_process_lines() {
     runner::run("process-lines", |run| {