fix: return A0404 for missing PDA pallets

lastleg-service/src/test/java/com/baiyue/lastleg/palletops/gateway/HttpPalletPhysicalGatewayTest.java

@@ -0,0 +1,40 @@
+package com.baiyue.lastleg.palletops.gateway;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.http.MediaType;
+import org.springframework.test.util.ReflectionTestUtils;
+import org.springframework.test.web.client.MockRestServiceServer;
+import org.springframework.web.client.RestClient;
+import org.springframework.web.server.ResponseStatusException;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.springframework.test.web.client.match.MockRestRequestMatchers.requestTo;
+import static org.springframework.test.web.client.response.MockRestResponseCreators.withSuccess;
+
+class HttpPalletPhysicalGatewayTest {
+    private HttpPalletPhysicalGateway gateway;
+    private MockRestServiceServer server;
+
+    @BeforeEach
+    void setUp() {
+        RestClient.Builder builder = RestClient.builder();
+        server = MockRestServiceServer.bindTo(builder).build();
+        gateway = new HttpPalletPhysicalGateway();
+        ReflectionTestUtils.setField(gateway, "client", builder.baseUrl("http://warehouse").build());
+        ReflectionTestUtils.setField(gateway, "internalToken", "test-token");
+    }
+
+    @Test
+    void resolveMapsBusinessNotFoundEnvelopeToStableNotFound() {
+        server.expect(requestTo("http://warehouse/internal/v1/warehouse-pallets/resolve/MISSING"))
+            .andRespond(withSuccess("""
+                {"code":"A0404","message":"Not found","data":null}
+                """, MediaType.APPLICATION_JSON));
+
+        assertThatThrownBy(() -> gateway.resolve("MISSING"))
+            .isInstanceOf(ResponseStatusException.class)
+            .hasMessageContaining("404");
+        server.verify();
+    }
+}

lastleg-service/src/test/java/com/baiyue/lastleg/palletops/service/PdaPalletOperationServiceTest.java

@@ -63,6 +63,16 @@ class PdaPalletOperationServiceTest {
         verifyNoInteractions(mapper);
     }
 
+    @Test void resolveReportsMissingOnSitePalletAsNotFound() {
+        when(physical.resolve("MISSING")).thenReturn(null);
+
+        ResponseStatusException failure = assertThrows(ResponseStatusException.class, () -> service.resolve(identity(),
+            new PalletOperationRequests.Scan("MISSING")));
+
+        assertEquals(404, failure.getStatusCode().value());
+        verifyNoInteractions(mapper);
+    }
+
     @Test void localConcurrencyFailureCompensatesEveryAppliedPhysicalTransitionInReverseSafeForm() {
         var source = pallet(10L, "SOURCE", 88L, 1);
         var target = pallet(20L, "TARGET", 88L, 2);