test(depinfo): add trailing separator test showcasing unintended trailing path separator

Author: seritools

tests/testsuite/dep_info.rs

@@ -552,3 +552,103 @@ fn non_local_build_script() {
 "#]],
     );
 }
+
+#[cargo_test]
+fn trailing_separator_after_package_root_build_script() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+            [package]
+            name = "foo"
+            version = "0.0.1"
+            authors = []
+            "#,
+        )
+        .file("src/main.rs", "fn main() {}")
+        .file(
+            "build.rs",
+            r#"
+            fn main() {
+                println!("cargo::rerun-if-changed=");
+            }
+            "#,
+        )
+        .build();
+
+    p.cargo("build").run();
+    let contents = p.read_file("target/debug/foo.d");
+
+    assert_e2e().eq(
+        &contents,
+        str![[r#"
+[ROOT]/foo/target/debug/foo[EXE]: [ROOT]/foo/ [ROOT]/foo/build.rs [ROOT]/foo/src/main.rs
+
+"#]],
+    );
+}
+
+#[cargo_test(nightly, reason = "proc_macro::tracked_path is unstable")]
+fn trailing_separator_after_package_root_proc_macro() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+            [package]
+            name = "foo"
+            version = "0.0.1"
+            authors = []
+            edition = "2018"
+
+            [dependencies]
+            pm = { path = "pm" }
+            "#,
+        )
+        .file(
+            "src/main.rs",
+            "
+            pm::noop!{}
+            fn main() {}
+            ",
+        )
+        .file(
+            "pm/Cargo.toml",
+            r#"
+            [package]
+            name = "pm"
+            version = "0.1.0"
+            edition = "2018"
+
+            [lib]
+            proc-macro = true
+            "#,
+        )
+        .file(
+            "pm/src/lib.rs",
+            r#"
+            #![feature(track_path)]
+            extern crate proc_macro;
+            use proc_macro::TokenStream;
+
+            #[proc_macro]
+            pub fn noop(_item: TokenStream) -> TokenStream {
+                proc_macro::tracked_path::path(
+                    std::env::current_dir().unwrap().to_str().unwrap()
+                );
+                "".parse().unwrap()
+            }
+            "#,
+        )
+        .build();
+
+    p.cargo("build").run();
+    let contents = p.read_file("target/debug/foo.d");
+
+    assert_e2e().eq(
+        &contents,
+        str![[r#"
+[ROOT]/foo/target/debug/foo[EXE]: [ROOT]/foo/ [ROOT]/foo/pm/src/lib.rs [ROOT]/foo/src/main.rs
+
+"#]],
+    );
+}