diff --git a/src/framework/Testee.ts b/src/framework/Testee.ts
index bb90f07..f3499b6 100644
--- a/src/framework/Testee.ts
+++ b/src/framework/Testee.ts
@@ -277,6 +277,7 @@ export class Testee { // TODO unified with testbed interface
                                 (testee, req, map) => timeout<object | void>(`sending instruction ${req.type}`, testee.timeout,
                                     testee.bed(step.target ?? Target.supervisor)!.sendRequest(map, req)),
                                 (testee) => testee.run(`Recover: re-initialize ${testee.testbed?.name}`, testee.connector.timeout, async function () {
+                                    await testee.shutdown();
                                     await testee.initialize(description.program, description.args ?? []).catch((o) => {
                                         return Promise.reject(o)
                                     });
diff --git a/src/messaging/Parsers.ts b/src/messaging/Parsers.ts
index 0e14a4f..a416379 100644
--- a/src/messaging/Parsers.ts
+++ b/src/messaging/Parsers.ts
@@ -29,7 +29,7 @@ export function remoteFunctionResult(result: RemoteFunctionResult): WASM.Value<T
     if (result.results.length === 0) {
         return nothing;
     }
-    return protocolValue(result.results[result.results.length - 1]);
+    return protocolValue(result.results[0]);
 }
 
 function protocolValue(value: ProtocolValue): WASM.Value<Type> {
diff --git a/src/testbeds/Emulator.ts b/src/testbeds/Emulator.ts
index ddc5a0d..72068b3 100644
--- a/src/testbeds/Emulator.ts
+++ b/src/testbeds/Emulator.ts
@@ -20,9 +20,15 @@ export class Emulator extends Platform {
         this.listen();
     }
 
-    kill(): Promise<void> {
-        this.connection.child?.kill();
-        return super.kill();
+    async kill(): Promise<void> {
+        const child = this.connection.child;
+        const closed = child === undefined || child.exitCode !== null || child.signalCode !== null
+            ? Promise.resolve()
+            : new Promise<void>((resolve) => child.once('close', resolve));
+
+        child?.kill();
+        await super.kill();
+        await closed;
     }
 
     async meta(): Promise<string> {
diff --git a/tests/end-to-end/spec.util.ts b/tests/end-to-end/spec.util.ts
index e1dc513..e4c70a0 100644
--- a/tests/end-to-end/spec.util.ts
+++ b/tests/end-to-end/spec.util.ts
@@ -81,7 +81,7 @@ function consume(input: string, cursor: number, regex: RegExp = / /): number {
 }
 
 function shouldParseLine(input: string): boolean {
-    return input.includes('(assert_return') && !input.replace(/\s+/g, '').startsWith(';;');
+    return input.includes('(assert_return') && input.includes('(invoke') && !input.replace(/\s+/g, '').startsWith(';;');
 }
 
 export function parseAsserts(file: string): string[] {
@@ -140,8 +140,8 @@ function parseInteger(hex: string, type: WASM.Integer): WasmInt {
         const n: number = parseInt(hex);
         return typeof n !== 'bigint' && isNaN(n) ? WasmInt.nan() : typeof n !== 'bigint' && n === Infinity ? WasmInt.infinity() : WasmInt.finite(BigInt(hex));
     }
-    const mask = BigInt(parseInt('0x80' + '00'.repeat(bytes - 1), 16));
-    let integer = BigInt(parseInt(hex, 16));
+    const mask = BigInt('0x80' + '00'.repeat(bytes - 1));
+    let integer = BigInt(hex);
     if (integer >= mask) {
         integer = integer - mask * 2n;
     }
diff --git a/tests/unit/interface.test.ts b/tests/unit/interface.test.ts
index b8f052b..458c534 100644
--- a/tests/unit/interface.test.ts
+++ b/tests/unit/interface.test.ts
@@ -1,5 +1,6 @@
 import test from 'ava';
 import {Duplex} from 'node:stream';
+import {EventEmitter} from 'node:events';
 import {SubProcess} from '../../src/bridge/SubProcess';
 import {Message} from '../../src/messaging/Message';
 import {SourceMap} from '../../src/sourcemap/SourceMap';
@@ -12,6 +13,7 @@ import {
     OperationResult
 } from '../../src/protocol/vendor/debug';
 import {WARDuino} from "../../src/debug/WARDuino";
+import {Emulator} from "../../src/testbeds/Emulator";
 import {Testee} from "../../src/framework/Testee";
 import {EmulatorSpecification} from "../../src/testbeds/TestbedSpecification";
 
@@ -68,6 +70,23 @@ test('[warduino] start emulator', t => {
     t.pass();
 });
 
+test('[emulator] shutdown waits for the child process to close', async t => {
+    const child = Object.assign(new EventEmitter(), {
+        exitCode: null,
+        signalCode: null,
+        kill: () => true
+    });
+    const emulator = new Emulator(new SubProcess(new TestChannel(), child as any));
+    let complete = false;
+    const shutdown = emulator.kill().then(() => { complete = true; });
+
+    await tick();
+    t.false(complete);
+    child.emit('close', 0, null);
+    await shutdown;
+    t.true(complete);
+});
+
 test('[platform] rejects outstanding requests when the connection closes with an error', async t => {
     const channel = new TestChannel();
     const platform = new TestPlatform(channel);
diff --git a/tests/unit/parsing.test.ts b/tests/unit/parsing.test.ts
index ee3ac55..c14febd 100644
--- a/tests/unit/parsing.test.ts
+++ b/tests/unit/parsing.test.ts
@@ -55,6 +55,19 @@ test("[protobuf invoke result] : decodes IEEE-754 float bits", t => {
     t.deepEqual(f64, {type: WASM.Float.f64, value: 2.5});
 });
 
+test("[protobuf invoke result] : selects the first declared result", t => {
+    const result = remoteFunctionResultParser(RemoteFunctionResult.encode({
+        success: true,
+        results: [
+            {i32Bits: 77, index: 0},
+            {f64Bits: 0x401c000000000000n, index: 1}
+        ],
+        error: Buffer.alloc(0)
+    }).finish());
+
+    t.deepEqual(result, {type: WASM.Integer.i32, value: WasmInt.finite(77n)});
+});
+
 test("[protobuf invoke result] : maps void, malformed, and failed responses", t => {
     const voidResult = remoteFunctionResultParser(RemoteFunctionResult.encode({success: true, results: [], error: Buffer.alloc(0)}).finish());
     t.deepEqual(voidResult, WASM.nothing);