1 files changed, 73 insertions, 0 deletions
diff --git a/tests/compare.rs b/tests/compare.rs
new file mode 100644
index 0000000..a4f0a32
--- /dev/null
+++ b/tests/compare.rs
@@ -0,0 +1,73 @@
+use alt_controller_image::compare::{Change, SemanticDifference, compare};
+use alt_controller_image::manifest::{
+    ArchiveMemberRecord, ArtifactManifest, FileRecord, InitrdRecord, PackageRecord, ServiceRecord,
+};
+use tempfile::tempdir;
+
+fn baseline() -> ArtifactManifest {
+    ArtifactManifest::new(
+        vec![PackageRecord::new("kernel-image-rt", "1.0")],
+        vec![FileRecord::file("etc/controller.conf", "aaa")],
+        Some(InitrdRecord::new("boot/initrd-rt.img", "old-initrd")),
+        vec![ServiceRecord::new("controller.service", true)],
+        vec![ArchiveMemberRecord::new("etc/controller.conf", "file")],
+    )
+    .expect("valid baseline manifest")
+}
+
+#[test]
+fn compares_added_removed_and_changed_semantic_records() {
+    let left = baseline();
+    let right = ArtifactManifest::new(
+        vec![
+            PackageRecord::new("kernel-image-rt", "2.0"),
+            PackageRecord::new("controller-agent", "1.0"),
+        ],
+        vec![FileRecord::symlink("etc/controller.conf", "controller.conf.real")],
+        Some(InitrdRecord::new("boot/initrd-rt.img", "new-initrd")),
+        vec![ServiceRecord::new("controller.service", false)],
+        vec![ArchiveMemberRecord::new("usr/bin/controller", "file")],
+    )
+    .expect("valid comparison manifest");
+
+    let report = compare(&left, &right);
+
+    assert_eq!(
+        report.differences(),
+        &[
+            SemanticDifference::Package { name: "controller-agent".into(), change: Change::Added },
+            SemanticDifference::Package { name: "kernel-image-rt".into(), change: Change::Changed },
+            SemanticDifference::File { path: "etc/controller.conf".into(), change: Change::Changed },
+            SemanticDifference::Initrd { change: Change::Changed },
+            SemanticDifference::Service { name: "controller.service".into(), change: Change::Changed },
+            SemanticDifference::ArchiveMember { path: "etc/controller.conf".into(), change: Change::Removed },
+            SemanticDifference::ArchiveMember { path: "usr/bin/controller".into(), change: Change::Added },
+        ]
+    );
+    assert!(report.render().contains("changed initrd"));
+}
+
+#[test]
+fn reads_and_writes_a_toml_manifest_beside_an_artifact() {
+    let fixture = tempdir().expect("temporary directory");
+    let artifact = fixture.path().join("controller.tar");
+    let manifest = baseline();
+
+    let manifest_path = manifest.write_beside(&artifact).expect("write manifest");
+    assert_eq!(manifest_path, fixture.path().join("artifact.manifest.toml"));
+    assert_eq!(ArtifactManifest::load(&manifest_path).expect("load manifest"), manifest);
+}
+
+#[test]
+fn rejects_duplicate_semantic_keys() {
+    let error = ArtifactManifest::new(
+        vec![PackageRecord::new("controller", "1"), PackageRecord::new("controller", "2")],
+        vec![],
+        None,
+        vec![],
+        vec![],
+    )
+    .expect_err("duplicate package names must fail");
+
+    assert!(error.to_string().contains("duplicate package record"));
+}