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workspace_learn/add/adder/.gitignore

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+/target

workspace_learn/add/adder/Cargo.toml

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+[package]
+name = "adder"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+add-one = { path = "../add-one" }

workspace_learn/add/adder/src/main.rs

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+use add_one;
+fn main() {
+    println!("Hello, world!");
+    add_one::add(1, 2);
+}
+
+#[test]
+fn it_works_add_one() {
+    assert_eq!(add_one::add(1, 2), 3);
+}