test: update rejection assertions after Kernel.queueMessage deserialization

All callers of kernel.queueMessage now receive plain Error objects for
vat rejections instead of raw CapData. Update 8 test files across
evm-wallet-experiment, kernel-node-runtime, and kernel-test to assert
rejects.toThrow() instead of rejects.toMatchObject({ body: ... }).

Author: grypez

packages/evm-wallet-experiment/test/integration/peer-wallet.test.ts

@@ -265,11 +265,7 @@ describe.sequential('Peer wallet integration', () => {
         // keys so this should reject, not forward to kernel1.
         await expect(
           kernel2.queueMessage(coordinatorKref2, 'signTransaction', [tx]),
-        ).rejects.toMatchObject({
-          body: expect.stringContaining(
-            'No authority to sign this transaction',
-          ),
-        });
+        ).rejects.toThrow('No authority to sign this transaction');
       },
       NETWORK_TIMEOUT,
     );
@@ -284,9 +280,7 @@ describe.sequential('Peer wallet integration', () => {
           kernel2.queueMessage(coordinatorKref2, 'signMessage', [
             'should fail',
           ]),
-        ).rejects.toMatchObject({
-          body: expect.stringContaining('No authority to sign message'),
-        });
+        ).rejects.toThrow('No authority to sign message');
       },
       NETWORK_TIMEOUT,
     );

packages/kernel-node-runtime/test/e2e/libp2p-v3-features.test.ts

@@ -241,11 +241,7 @@ describe.sequential('libp2p v3 Features E2E', () => {
             'hello',
             ['Alice'],
           ]),
-        ).rejects.toMatchObject({
-          body: expect.stringContaining(
-            'Message delivery failed after intentional close',
-          ),
-        });
+        ).rejects.toThrow('Message delivery failed after intentional close');
         const elapsed = Date.now() - start;
 
         // Should fail well under the write timeout

packages/kernel-node-runtime/test/e2e/orphaned-ephemeral-exo.test.ts

@@ -58,9 +58,7 @@ describe('Orphaned ephemeral exo', { timeout: 30_000 }, () => {
         // This is surfaced to the caller as an OBJECT_DELETED kernel error.
         await expect(
           kernel.queueMessage(rootKref, 'useEphemeral', []),
-        ).rejects.toMatchObject({
-          body: expect.stringContaining('[KERNEL:OBJECT_DELETED]'),
-        });
+        ).rejects.toThrow('[KERNEL:OBJECT_DELETED]');
       } finally {
         await kernel.stop();
       }

packages/kernel-node-runtime/test/e2e/remote-comms.test.ts

@@ -825,11 +825,9 @@ describe.sequential('Remote Communications E2E', () => {
         kernel2 = restartResult.kernel;
 
         // The message should not have been delivered because we didn't reconnect
-        await expect(messageAfterClose).rejects.toMatchObject({
-          body: expect.stringContaining(
-            'Message delivery failed after intentional close',
-          ),
-        });
+        await expect(messageAfterClose).rejects.toThrow(
+          'Message delivery failed after intentional close',
+        );
       },
       NETWORK_TIMEOUT * 2,
     );
@@ -916,11 +914,7 @@ describe.sequential('Remote Communications E2E', () => {
             'hello',
             ['Alice'],
           ]),
-        ).rejects.toMatchObject({
-          body: expect.stringContaining(
-            'Message delivery failed after intentional close',
-          ),
-        });
+        ).rejects.toThrow('Message delivery failed after intentional close');
 
         // Manually reconnect
         await kernel1.reconnectPeer(peerId2);
@@ -1009,9 +1003,7 @@ describe.sequential('Remote Communications E2E', () => {
             'hello',
             ['Alice'],
           ]),
-        ).rejects.toMatchObject({
-          body: expect.stringMatching(/Remote connection lost/u),
-        });
+        ).rejects.toThrow(/Remote connection lost/u);
       },
       NETWORK_TIMEOUT * 3,
     );
@@ -1064,9 +1056,7 @@ describe.sequential('Remote Communications E2E', () => {
             'hello',
             ['Alice'],
           ]),
-        ).rejects.toMatchObject({
-          body: expect.stringContaining('Remote connection lost'),
-        });
+        ).rejects.toThrow('Remote connection lost');
       },
       NETWORK_TIMEOUT * 2,
     );

packages/kernel-test/src/endowments.test.ts

@@ -51,9 +51,7 @@ describe('endowments', () => {
 
     await expect(
       kernel.queueMessage(v1Root, 'hello', [`https://${badHost}`]),
-    ).rejects.toMatchObject({
-      body: expect.stringContaining(`Invalid host: ${badHost}`),
-    });
+    ).rejects.toThrow(`Invalid host: ${badHost}`);
 
     await waitUntilQuiescent();
 

packages/kernel-test/src/orphaned-ephemeral-exo.test.ts

@@ -43,8 +43,6 @@ describe('orphaned ephemeral exo', () => {
     // crank, but the endpoint is gone — so it splats and rejects.
     await expect(
       kernel.queueMessage(rootKref, 'useEphemeral', []),
-    ).rejects.toMatchObject({
-      body: expect.stringContaining('[KERNEL:OBJECT_DELETED]'),
-    });
+    ).rejects.toThrow('[KERNEL:OBJECT_DELETED]');
   });
 });

packages/kernel-test/src/syscall-validation.test.ts

@@ -97,9 +97,7 @@ describe('Syscall Validation & Revoked Objects', { timeout: 30_000 }, () => {
     // Try to send message to revoked object — kernel rejects the promise
     await expect(
       kernel.queueMessage(objectKRef, 'getValue', []),
-    ).rejects.toMatchObject({
-      body: expect.stringContaining('[KERNEL:OBJECT_REVOKED]'),
-    });
+    ).rejects.toThrow('[KERNEL:OBJECT_REVOKED]');
     // Verify kernel doesn't crash and exporter vat remains operational
     const exporterStatus = await kernel.queueMessage(exporterKRef, 'noop', []);
     expect(exporterStatus.body).toContain('noop');
@@ -145,19 +143,15 @@ describe('Syscall Validation & Revoked Objects', { timeout: 30_000 }, () => {
     // Send message to revoked object — kernel rejects the promise
     await expect(
       kernel.queueMessage(objectKRef, 'getValue', []),
-    ).rejects.toMatchObject({
-      body: expect.stringContaining('[KERNEL:OBJECT_REVOKED]'),
-    });
+    ).rejects.toThrow('[KERNEL:OBJECT_REVOKED]');
     // Verify exporter vat is still operational
     const exporterStatus = await kernel.queueMessage(exporterKRef, 'noop', []);
     expect(exporterStatus.body).toContain('noop');
     // Verify kernel can handle multiple revoked object accesses
     for (let i = 0; i < 5; i++) {
       await expect(
         kernel.queueMessage(objectKRef, 'getValue', []),
-      ).rejects.toMatchObject({
-        body: expect.stringContaining('[KERNEL:OBJECT_REVOKED]'),
-      });
+      ).rejects.toThrow('[KERNEL:OBJECT_REVOKED]');
     }
     // Verify kernel remains stable
     const finalStatus = await kernel.queueMessage(exporterKRef, 'noop', []);
@@ -217,9 +211,7 @@ describe('Syscall Validation & Revoked Objects', { timeout: 30_000 }, () => {
     for (const objectKRef of objectKRefs) {
       await expect(
         kernel.queueMessage(objectKRef, 'getValue', []),
-      ).rejects.toMatchObject({
-        body: expect.stringContaining('[KERNEL:OBJECT_REVOKED]'),
-      });
+      ).rejects.toThrow('[KERNEL:OBJECT_REVOKED]');
     }
 
     // Verify exporter vat is still operational

packages/kernel-test/src/vat-lifecycle.test.ts

@@ -134,9 +134,7 @@ describe('Vat Lifecycle', { timeout: 30_000 }, () => {
     // Try to send a message to the terminated vat's root object — rejects
     await expect(
       kernel.queueMessage(deadRootObject, 'resume', []),
-    ).rejects.toMatchObject({
-      body: expect.stringContaining('[KERNEL:OBJECT_DELETED]'),
-    });
+    ).rejects.toThrow('[KERNEL:OBJECT_DELETED]');
 
     // Verify that messaging works as expected
     expect(await runResume(kernel, liveRootObject)).toBe(