Add a cargo-fmt test case for issue 6517

The test case loads package targets from the root of a workspace.

Author: ytmimi

Diff for: src/cargo-fmt/test/targets.rs

@@ -134,4 +134,32 @@ mod all_targets {
             assert_correct_targets_loaded("ws/a/d/f/Cargo.toml");
         }
     }
+
+    mod cargo_fmt_strategy_root {
+        use super::*;
+
+        #[test]
+        fn assert_correct_targets_loaded_from_root() {
+            let exp_targets = &[
+                ExpTarget {
+                    path: "inner_bin/src/main.rs",
+                    edition: Edition::E2021,
+                    kind: "bin",
+                },
+                ExpTarget {
+                    path: "inner_lib/src/lib.rs",
+                    edition: Edition::E2021,
+                    kind: "lib",
+                },
+            ];
+
+            super::assert_correct_targets_loaded(
+                "Cargo.toml",
+                "issues_6517",
+                exp_targets,
+                2,
+                CargoFmtStrategy::Root,
+            );
+        }
+    }
 }

Diff for: tests/cargo-fmt/source/issues_6517/Cargo.toml

@@ -0,0 +1,2 @@
+[workspace]
+members = ["inner_bin", "inner_lib"]

Diff for: tests/cargo-fmt/source/issues_6517/inner_bin/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "inner_bin"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

Diff for: tests/cargo-fmt/source/issues_6517/inner_bin/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

Diff for: tests/cargo-fmt/source/issues_6517/inner_lib/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "inner_lib"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

Diff for: tests/cargo-fmt/source/issues_6517/inner_lib/src/lib.rs

@@ -0,0 +1,14 @@
+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}