1 files changed, 33 insertions, 1 deletions
diff --git a/tests/cli.rs b/tests/cli.rs
index b800e68..648962b 100644
--- a/tests/cli.rs
+++ b/tests/cli.rs
@@ -1,7 +1,11 @@
+use std::fs;
 use std::path::PathBuf;
 
-use alt_controller_image::cli::{Cli, Command};
+use alt_controller_image::archive::NativeTarWriter;
+use alt_controller_image::cli::{run, Cli, Command};
+use alt_controller_image::manifest::{ArtifactManifest, PackageRecord};
 use clap::Parser;
+use tempfile::tempdir;
 
 #[test]
 fn parses_plan_with_an_explicit_spec_path() {
@@ -69,3 +73,31 @@ fn parses_compare_with_explicit_artifact_paths() {
             if left == PathBuf::from("legacy.tar") && right == PathBuf::from("native.tar")
     ));
 }
+
+#[test]
+fn compare_uses_companion_manifests_for_tar_artifacts() {
+    let fixture = tempdir().expect("temporary directory");
+    let rootfs = fixture.path().join("rootfs");
+    fs::create_dir_all(&rootfs).expect("create rootfs");
+    let left = fixture.path().join("left.tar");
+    let right = fixture.path().join("right.tar");
+    NativeTarWriter::new().write(&rootfs, &left).expect("write left archive");
+    NativeTarWriter::new().write(&rootfs, &right).expect("write right archive");
+    ArtifactManifest::new(
+        vec![PackageRecord::new("controller", "1.0")], vec![], None, vec![], vec![],
+    )
+    .expect("left manifest")
+    .write_beside(&left)
+    .expect("write left companion manifest");
+    ArtifactManifest::new(
+        vec![PackageRecord::new("controller", "2.0")], vec![], None, vec![], vec![],
+    )
+    .expect("right manifest")
+    .write_beside(&right)
+    .expect("write right companion manifest");
+
+    let error = run(Cli { command: Command::Compare { left, right } })
+        .expect_err("companion package difference must be reported");
+
+    assert!(error.to_string().contains("artifacts differ semantically"));
+}