chore: a bit of coverage work

packages/cli/bin/move_ship.dart

@@ -102,7 +102,8 @@ Future<void> command(FileSystem fs, Api api, Caches caches) async {
       ship,
       jumpGateWaypoint,
     );
-    await Future<void>.delayed(durationUntil(arrival));
+    final durationUntil = arrival.difference(DateTime.timestamp());
+    await Future<void>.delayed(durationUntil);
   }
   final jumpRequest = JumpShipRequest(systemSymbol: destSystem.symbol);
   await api.fleet.jumpShip(ship.symbol, jumpShipRequest: jumpRequest);

packages/cli/lib/api.dart

@@ -638,9 +638,8 @@ extension ShipyardUtils on Shipyard {
   WaypointSymbol get waypointSymbol => WaypointSymbol.fromString(symbol);
 
   /// Returns true if the Shipyard has the given ship type.
-  bool hasShipType(ShipType shipType) {
-    return shipTypes.any((s) => s.type == shipType);
-  }
+  bool hasShipType(ShipType shipType) =>
+      shipTypes.any((s) => s.type == shipType);
 }
 
 /// Extensions onto MarketTransaction to make it easier to work with.
@@ -691,10 +690,6 @@ extension AgentUtils on Agent {
       WaypointSymbol.fromString(headquarters);
 }
 
-/// Returns the duration until the given date time.
-Duration durationUntil(DateTime dateTime) =>
-    dateTime.difference(DateTime.now());
-
 /// Creates a ConnectedSystem from a System and a distance.
 ConnectedSystem connectedSystemFromSystem(System system, int distance) {
   return ConnectedSystem(
@@ -708,11 +703,13 @@ ConnectedSystem connectedSystemFromSystem(System system, int distance) {
 }
 
 /// Compute the trade symbol for the given mount symbol.
-TradeSymbol? tradeSymbolForMountSymbol(ShipMountSymbolEnum mountSymbol) {
-  return TradeSymbol.fromJson(mountSymbol.value);
+/// TradeSymbols are a superset of ShipMountSymbols so this should never fail.
+TradeSymbol tradeSymbolForMountSymbol(ShipMountSymbolEnum mountSymbol) {
+  return TradeSymbol.fromJson(mountSymbol.value)!;
 }
 
 /// Compute the mount symbol for the given trade symbol.
+/// This will return null if the trade symbol is not a mount symbol.
 ShipMountSymbolEnum? mountSymbolForTradeSymbol(TradeSymbol tradeSymbol) {
   return ShipMountSymbolEnum.fromJson(tradeSymbol.value);
 }

packages/cli/test/api_test.dart

@@ -136,4 +136,32 @@ void main() {
       ShipSymbol.fromString('A-1A'),
     ]);
   });
+  test('FactionUtils', () {
+    final faction = Faction(
+      description: '',
+      symbol: FactionSymbols.AEGIS,
+      name: '',
+      headquarters: 'S-A-W',
+      traits: [],
+      isRecruiting: true,
+    );
+    expect(faction.headquartersSymbol, WaypointSymbol.fromString('S-A-W'));
+  });
+  test('AgentUtils', () {
+    final agent = Agentco
+      symbol: 'A-1',
+      headquarters: 'S-A-W',
+      credits: 0,
+      startingFaction: FactionSymbols.AEGIS.value,
+    );
+    expect(agent.headquartersSymbol, WaypointSymbol.fromString('S-A-W'));
+  });
+  test('tradeSymbolForMountSymbol', () {
+    for (final mountSymbol in ShipMountSymbolEnum.values) {
+      final tradeSymbol = tradeSymbolForMountSymbol(mountSymbol);
+      expect(mountSymbolForTradeSymbol(tradeSymbol), mountSymbol);
+    }
+    // Non-mount symbols will fail however:
+    expect(mountSymbolForTradeSymbol(TradeSymbol.ADVANCED_CIRCUITRY), isNull);
+  });
 }