Add integration test

Author: tsmbland

tests/graph.rs

@@ -0,0 +1,32 @@
+//! Integration tests for the `graph` command.
+use muse2::cli::{GraphOpts, handle_graph_command};
+use muse2::log::is_logger_initialised;
+use muse2::settings::Settings;
+use std::path::PathBuf;
+use tempfile::tempdir;
+
+/// Get the path to the example model.
+fn get_model_dir() -> PathBuf {
+    PathBuf::from("examples/simple")
+}
+
+/// An integration test for the `graph` command.
+///
+/// We also check that the logger is initialised after it is run.
+#[test]
+fn test_handle_graph_command() {
+    unsafe { std::env::set_var("MUSE2_LOG_LEVEL", "off") };
+
+    assert!(!is_logger_initialised());
+
+    // Save results to non-existent directory to check that directory creation works
+    let tempdir = tempdir().unwrap();
+    let output_dir = tempdir.path().join("results");
+    let opts = GraphOpts {
+        output_dir: Some(output_dir),
+        overwrite: false,
+    };
+    handle_graph_command(&get_model_dir(), &opts, Some(Settings::default())).unwrap();
+
+    assert!(is_logger_initialised());
+}