add assert_cmd to test binaries

examples/cli/Cargo.toml

@@ -16,3 +16,4 @@ harmony_macros = { path = "../../harmony_macros" }
 log = { workspace = true }
 env_logger = { workspace = true }
 url = { workspace = true }
+assert_cmd = "2.0.16"

examples/cli/src/main.rs

@@ -18,3 +18,13 @@ async fn main() {
     ]);
     harmony_cli::init(maestro).await.unwrap();
 }
+
+use assert_cmd::Command;
+
+#[test]
+fn test_example() {
+    let mut cmd = Command::cargo_bin("example-cli").unwrap();
+    let assert = cmd.arg("--run").arg("SuccessScore").assert();
+
+    assert.success();
+}