Add unit test for files called target.

rust-lang#12790

tests/testsuite/package.rs

@@ -3,9 +3,7 @@
 use cargo_test_support::paths::CargoPathExt;
 use cargo_test_support::publish::validate_crate_contents;
 use cargo_test_support::registry::{self, Package};
-use cargo_test_support::{
-    basic_manifest, cargo_process, git, path2url, paths, project, symlink_supported, t,
-};
+use cargo_test_support::{basic_manifest, cargo_process, git, path2url, paths, project, ProjectBuilder, symlink_supported, t};
 use flate2::read::GzDecoder;
 use std::fs::{self, read_to_string, File};
 use std::path::Path;
@@ -3095,3 +3093,76 @@ src/main.rs
         &[],
     );
 }
+
+#[cargo_test]
+fn include_files_called_target_project() {
+    // https://github.com/rust-lang/cargo/issues/12790
+    // files and folders called "target" should be included, unless they're the actual target directory
+
+    let p = init_project_files_called_target(project()).build();
+
+    p.cargo("package -l")
+        .with_stdout(
+            "\
+Cargo.lock
+Cargo.toml
+Cargo.toml.orig
+data/not_target
+data/target
+derp/not_target/foo.txt
+derp/target/foo.txt
+src/main.rs
+",
+        )
+        .run();
+}
+
+#[cargo_test]
+fn include_files_called_target_git() {
+    // https://github.com/rust-lang/cargo/issues/12790
+    // files and folders called "target" should be included, unless they're the actual target directory
+
+    let p = git::new("all", |p| init_project_files_called_target(p));
+
+    p.cargo("package -l")
+        .with_stdout(
+            "\
+.cargo_vcs_info.json
+Cargo.lock
+Cargo.toml
+Cargo.toml.orig
+data/not_target
+data/target
+derp/not_target/foo.txt
+derp/target/foo.txt
+src/main.rs
+",
+        )
+        .run();
+}
+
+fn init_project_files_called_target(p: ProjectBuilder) -> ProjectBuilder {
+    p.file(
+        "Cargo.toml",
+        r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                authors = []
+                license = "MIT"
+                description = "foo"
+            "#,
+    )
+        .file("src/main.rs", r#"fn main() { println!("hello"); }"#)
+
+        // actual target dir, should be excluded
+        .file("target/foo.txt", "")
+
+        // file called target, should be included
+        .file("data/target", "")
+        .file("data/not_target", "")
+
+        // folder called target, should be included
+        .file("derp/target/foo.txt", "")
+        .file("derp/not_target/foo.txt", "")
+}