Truck assiggnment and per truc

apps/edr-freight-api/src/common/truck-load.util.spec.ts

@@ -45,6 +45,16 @@ describe('assertTruckLoad', () => {
     ).toThrow(BadRequestException);
   });
 
+  it('allows two containers only when both are explicitly 20ft', () => {
+    expect(() =>
+      assertTruckLoad({
+        containers: ['ABCD1234567', 'ABCD7654321'],
+        bookingContainers: booking,
+        sizes: ['20ft', '45ft'],
+      }),
+    ).toThrow(BadRequestException);
+  });
+
   it('rejects more than two containers', () => {
     expect(() =>
       assertTruckLoad({

apps/edr-freight-api/src/common/truck-load.util.ts

@@ -54,10 +54,11 @@ export function assertTruckLoad({
     }
   }
 
-  // A 40ft fills the bed, so it travels alone.
-  if (containers.length > 1 && sizes.some((size) => size.includes('40'))) {
+  // A truck may pair containers only when BOTH are explicitly 20ft. A 40ft
+  // (and any legacy/unknown larger size) fills the bed and travels alone.
+  if (containers.length > 1 && sizes.some((size) => !size.includes('20'))) {
     throw new BadRequestException(
-      'A 40ft container fills the truck — assign only 1 container to this truck',
+      'Truck capacity is either 1 x 40ft container or up to 2 x 20ft containers',
     );
   }
 }