1 files changed, 226 insertions, 0 deletions
diff --git a/src/tools/cargo/tests/testsuite/paths.rs b/src/tools/cargo/tests/testsuite/paths.rs
new file mode 100644
index 000000000..31e00ae11
--- /dev/null
+++ b/src/tools/cargo/tests/testsuite/paths.rs
@@ -0,0 +1,226 @@
+//! Tests for `paths` overrides.
+
+use cargo_test_support::registry::Package;
+use cargo_test_support::{basic_manifest, project};
+
+#[cargo_test]
+fn broken_path_override_warns() {
+    Package::new("bar", "0.1.0").publish();
+    Package::new("bar", "0.2.0").publish();
+
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                authors = []
+
+                [dependencies]
+                a = { path = "a1" }
+            "#,
+        )
+        .file("src/lib.rs", "")
+        .file(
+            "a1/Cargo.toml",
+            r#"
+                [package]
+                name = "a"
+                version = "0.0.1"
+                authors = []
+
+                [dependencies]
+                bar = "0.1"
+            "#,
+        )
+        .file("a1/src/lib.rs", "")
+        .file(
+            "a2/Cargo.toml",
+            r#"
+                [package]
+                name = "a"
+                version = "0.0.1"
+                authors = []
+
+                [dependencies]
+                bar = "0.2"
+            "#,
+        )
+        .file("a2/src/lib.rs", "")
+        .file(".cargo/config", r#"paths = ["a2"]"#)
+        .build();
+
+    p.cargo("check")
+        .with_stderr(
+            "\
+[UPDATING] [..]
+warning: path override for crate `a` has altered the original list of
+dependencies; the dependency on `bar` was either added or
+modified to not match the previously resolved version
+
+This is currently allowed but is known to produce buggy behavior with spurious
+recompiles and changes to the crate graph. Path overrides unfortunately were
+never intended to support this feature, so for now this message is just a
+warning. In the future, however, this message will become a hard error.
+
+To change the dependency graph via an override it's recommended to use the
+`[patch]` feature of Cargo instead of the path override feature. This is
+documented online at the url below for more information.
+
+https://doc.rust-lang.org/cargo/reference/overriding-dependencies.html
+
+[DOWNLOADING] crates ...
+[DOWNLOADED] [..]
+[CHECKING] [..]
+[CHECKING] [..]
+[CHECKING] [..]
+[FINISHED] [..]
+",
+        )
+        .run();
+}
+
+#[cargo_test]
+fn override_to_path_dep() {
+    Package::new("bar", "0.1.0").dep("baz", "0.1").publish();
+    Package::new("baz", "0.1.0").publish();
+
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                authors = []
+
+                [dependencies]
+                bar = "0.1.0"
+            "#,
+        )
+        .file("src/lib.rs", "")
+        .file(
+            "bar/Cargo.toml",
+            r#"
+                [package]
+                name = "bar"
+                version = "0.0.1"
+                authors = []
+
+                [dependencies]
+                baz = { path = "baz" }
+            "#,
+        )
+        .file("bar/src/lib.rs", "")
+        .file("bar/baz/Cargo.toml", &basic_manifest("baz", "0.0.1"))
+        .file("bar/baz/src/lib.rs", "")
+        .file(".cargo/config", r#"paths = ["bar"]"#)
+        .build();
+
+    p.cargo("check").run();
+}
+
+#[cargo_test]
+fn paths_ok_with_optional() {
+    Package::new("baz", "0.1.0").publish();
+
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                authors = []
+
+                [dependencies]
+                bar = { path = "bar" }
+            "#,
+        )
+        .file("src/lib.rs", "")
+        .file(
+            "bar/Cargo.toml",
+            r#"
+                [package]
+                name = "bar"
+                version = "0.1.0"
+                authors = []
+
+                [dependencies]
+                baz = { version = "0.1", optional = true }
+            "#,
+        )
+        .file("bar/src/lib.rs", "")
+        .file(
+            "bar2/Cargo.toml",
+            r#"
+                [package]
+                name = "bar"
+                version = "0.1.0"
+                authors = []
+
+                [dependencies]
+                baz = { version = "0.1", optional = true }
+            "#,
+        )
+        .file("bar2/src/lib.rs", "")
+        .file(".cargo/config", r#"paths = ["bar2"]"#)
+        .build();
+
+    p.cargo("check")
+        .with_stderr(
+            "\
+[CHECKING] bar v0.1.0 ([..]bar2)
+[CHECKING] foo v0.0.1 ([..])
+[FINISHED] [..]
+",
+        )
+        .run();
+}
+
+#[cargo_test]
+fn paths_add_optional_bad() {
+    Package::new("baz", "0.1.0").publish();
+
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                authors = []
+
+                [dependencies]
+                bar = { path = "bar" }
+            "#,
+        )
+        .file("src/lib.rs", "")
+        .file("bar/Cargo.toml", &basic_manifest("bar", "0.1.0"))
+        .file("bar/src/lib.rs", "")
+        .file(
+            "bar2/Cargo.toml",
+            r#"
+                [package]
+                name = "bar"
+                version = "0.1.0"
+                authors = []
+
+                [dependencies]
+                baz = { version = "0.1", optional = true }
+            "#,
+        )
+        .file("bar2/src/lib.rs", "")
+        .file(".cargo/config", r#"paths = ["bar2"]"#)
+        .build();
+
+    p.cargo("check")
+        .with_stderr_contains(
+            "\
+warning: path override for crate `bar` has altered the original list of
+dependencies; the dependency on `baz` was either added or\
+",
+        )
+        .run();
+}