test(package): Show behavior with capitalized member

tests/testsuite/package.rs

@@ -6430,6 +6430,74 @@ fn workspace_with_local_and_remote_deps() {
         .run();
 }
 
+#[cargo_test]
+fn workspace_with_capitalized_member() {
+    let reg = registry::init();
+
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+            [workspace]
+            members = ["dep", "main"]
+            "#,
+        )
+        .file(
+            "main/Cargo.toml",
+            r#"
+            [package]
+            name = "main"
+            version = "0.0.1"
+            edition = "2015"
+            authors = []
+            license = "MIT"
+            description = "main"
+            repository = "bar"
+
+            [dependencies]
+            DEP = { path = "../dep", version = "0.1.0" }
+        "#,
+        )
+        .file("main/src/main.rs", "fn main() {}")
+        .file(
+            "dep/Cargo.toml",
+            r#"
+            [package]
+            name = "DEP"
+            version = "0.1.0"
+            edition = "2015"
+            authors = []
+            license = "MIT"
+            description = "dep"
+            repository = "bar"
+        "#,
+        )
+        .file("dep/src/lib.rs", "")
+        .build();
+
+    p.cargo("package -Zpackage-workspace --no-verify")
+        .masquerade_as_nightly_cargo(&["package-workspace"])
+        .replace_crates_io(reg.index_url())
+        .with_status(101)
+        .with_stderr_data(
+            str![[r#"
+[PACKAGING] main v0.0.1 ([ROOT]/foo/main)
+[UPDATING] crates.io index
+[PACKAGED] 4 files, [FILE_SIZE]B ([FILE_SIZE]B compressed)
+[PACKAGING] DEP v0.1.0 ([ROOT]/foo/dep)
+[ERROR] failed to prepare local package for uploading
+
+Caused by:
+  no matching package named `DEP` found
+  location searched: crates.io index
+  required by package `main v0.0.1 ([ROOT]/foo/main)`
+
+"#]]
+            .unordered(),
+        )
+        .run();
+}
+
 #[cargo_test]
 fn registry_not_in_publish_list() {
     let p = project()