Complete the end-to-end CLI parity audit

crates/storage/tests/compatibility_fixtures.rs

@@ -4,6 +4,8 @@ mod support;
 
 use std::collections::{BTreeMap, BTreeSet};
 
+use ironstorage::command::parse_from;
+
 use support::compatibility::{
     FixtureSet, TestResult, decrypt_entry_with_passphrase, validate_entry_record,
     validate_key_record, validate_recipient_signature, validate_repository,
@@ -154,6 +156,37 @@ fn behavior_catalog_covers_the_milestone_contract() -> TestResult {
     Ok(())
 }
 
+#[test]
+fn every_compatibility_case_reaches_the_typed_command_contract() -> TestResult {
+    let fixture = FixtureSet::load()?;
+    for case in &fixture.behavior.cases {
+        let arguments = std::iter::once("ironstorage").chain(case.argv.iter().map(String::as_str));
+        let parsed = parse_from(arguments);
+        let parser_rejection = case.outcome.contains("usage-error")
+            || case.outcome.contains("unsupported-option")
+            || matches!(
+                case.id.as_str(),
+                "generate-zero" | "git-unsupported-passthrough"
+            );
+        assert_eq!(
+            parsed.is_err(),
+            parser_rejection,
+            "unexpected command-contract result for {}: {:?}",
+            case.id,
+            parsed
+        );
+        if let Err(error) = parsed {
+            assert_eq!(
+                error.exit_code(),
+                case.status as u8,
+                "status for {}",
+                case.id
+            );
+        }
+    }
+    Ok(())
+}
+
 #[test]
 fn generated_openpgp_fixtures_are_self_consistent() -> TestResult {
     let fixture = FixtureSet::load()?;