Implement test for optional non-dev dependency fix

Author: smoelius

.gitignore

@@ -1 +1 @@
-/target
+target

fixtures/optional_non_dev_dep/Cargo.lock

@@ -0,0 +1,13 @@
+[package]
+name = "optional_non_dev_dep"
+version = "0.1.0"
+edition = "2024"
+publish = false
+
+[dependencies]
+libz-rs-sys = { version = "=0.5.5", optional = true }
+
+[dev-dependencies]
+libz-rs-sys = "=0.5.5"
+
+[workspace]

fixtures/optional_non_dev_dep/Cargo.toml

@@ -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);
+    }
+}