diff --git a/src/main/mocha.ts b/src/main/mocha.ts
index 1bd4564..049574b 100644
--- a/src/main/mocha.ts
+++ b/src/main/mocha.ts
@@ -50,6 +50,7 @@ export default class MochaWrapper extends Mocha {
 
   setMaxParallel(maxParallel: number) {
     this.maxParallel = maxParallel;
+    return this;
   }
 
   enableExitMode() {
diff --git a/test/delay/reporter.js b/test/delay/reporter.js
deleted file mode 100644
index 59ed300..0000000
--- a/test/delay/reporter.js
+++ /dev/null
@@ -1,32 +0,0 @@
-'use strict';
-
-const Base = require('mocha').reporters.Base;
-
-class Reporter extends Base {
-    constructor(runner) {
-        super(runner);
-
-        [
-            'waiting',
-            'start',
-            'end',
-            'suite',
-            'suite end',
-            'test',
-            'test end',
-            'pass',
-            'fail',
-            'pending',
-            'hook',
-            'hook end',
-        ].forEach((evtName) => {
-            runner.on(evtName, this.onRunnerEventFired.bind(this, evtName));
-        });
-    }
-
-    onRunnerEventFired(evtName) {
-        console.log(evtName);
-    }
-}
-
-exports = module.exports = Reporter;
diff --git a/test/index.sh b/test/index.sh
index a932f7a..6a793a4 100755
--- a/test/index.sh
+++ b/test/index.sh
@@ -76,6 +76,7 @@ test 'TESTCASE: --retries and --bail should work well together' test/bail-and-re
 test 'TESTCASE: subprocess exits before sending an end message' test/no-subprocess-end/index.js
 test 'TESTCASE: unhandled rejections should not force subprocess to exit' test/q-promises/index.js
 test 'TESTCASE: uncaught exceptions should not force subprocess to exit' test/uncaught-exception/index.js
+test 'TESTCASE: subprocess reusage' test/subprocess-reuse/index.js
 
 echo "Passes: $PASSES Failes: $FAILES"
 echo ""
diff --git a/test/subprocess-reuse/.gitignore b/test/subprocess-reuse/.gitignore
new file mode 100644
index 0000000..44b6a6a
--- /dev/null
+++ b/test/subprocess-reuse/.gitignore
@@ -0,0 +1 @@
+counter.json
diff --git a/test/subprocess-reuse/README b/test/subprocess-reuse/README
new file mode 100644
index 0000000..c6eaa33
--- /dev/null
+++ b/test/subprocess-reuse/README
@@ -0,0 +1 @@
+Check that subprocesses are reused
diff --git a/test/subprocess-reuse/index.js b/test/subprocess-reuse/index.js
new file mode 100755
index 0000000..128e018
--- /dev/null
+++ b/test/subprocess-reuse/index.js
@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+
+const assert = require('assert');
+const { writeFileSync } = require('fs');
+const { resolve } = require('path');
+const MochaParallelTests = require('../../dist/main/mocha').default;
+
+const counterFilePath = resolve(__dirname, 'counter.json');
+const reporterPath = resolve(__dirname, '../util/silent-reporter.js');
+
+process.on('unhandledRejection', (reason) => {
+    console.error(reason.stack);
+    process.exit(1);
+});
+
+// initialize counter file
+writeFileSync(counterFilePath, '[]');
+
+const mocha = new MochaParallelTests();
+mocha
+    .reporter(reporterPath)
+    .addFile(`${__dirname}/spec/1.spec.js`)
+    .addFile(`${__dirname}/spec/2.spec.js`)
+    .addFile(`${__dirname}/spec/3.spec.js`)
+    .addFile(`${__dirname}/spec/4.spec.js`)
+    .slow(5000)
+    .setMaxParallel(2)
+    .run()
+    .on('end', function () {
+        const pidsUsed = require(counterFilePath);
+        assert.strictEqual(pidsUsed.length, 2, `Number of processes is wrong: ${pidsUsed.length}`);
+    });
diff --git a/test/subprocess-reuse/spec/1.spec.js b/test/subprocess-reuse/spec/1.spec.js
new file mode 100644
index 0000000..9258545
--- /dev/null
+++ b/test/subprocess-reuse/spec/1.spec.js
@@ -0,0 +1,17 @@
+const { writeFileSync } = require('fs');
+const { resolve } = require('path');
+
+const updateCounterWithOwnPid = () => {
+    const counterFilePath = resolve(__dirname, '../counter.json');
+    const pids = new Set(require(counterFilePath));
+
+    pids.add(process.pid);
+    writeFileSync(counterFilePath, JSON.stringify([...pids]));
+};
+
+describe('suite', () => {
+    it('case', (done) => {
+        updateCounterWithOwnPid();
+        setTimeout(done, 1000);
+    });
+});
diff --git a/test/subprocess-reuse/spec/2.spec.js b/test/subprocess-reuse/spec/2.spec.js
new file mode 100644
index 0000000..9258545
--- /dev/null
+++ b/test/subprocess-reuse/spec/2.spec.js
@@ -0,0 +1,17 @@
+const { writeFileSync } = require('fs');
+const { resolve } = require('path');
+
+const updateCounterWithOwnPid = () => {
+    const counterFilePath = resolve(__dirname, '../counter.json');
+    const pids = new Set(require(counterFilePath));
+
+    pids.add(process.pid);
+    writeFileSync(counterFilePath, JSON.stringify([...pids]));
+};
+
+describe('suite', () => {
+    it('case', (done) => {
+        updateCounterWithOwnPid();
+        setTimeout(done, 1000);
+    });
+});
diff --git a/test/subprocess-reuse/spec/3.spec.js b/test/subprocess-reuse/spec/3.spec.js
new file mode 100644
index 0000000..9258545
--- /dev/null
+++ b/test/subprocess-reuse/spec/3.spec.js
@@ -0,0 +1,17 @@
+const { writeFileSync } = require('fs');
+const { resolve } = require('path');
+
+const updateCounterWithOwnPid = () => {
+    const counterFilePath = resolve(__dirname, '../counter.json');
+    const pids = new Set(require(counterFilePath));
+
+    pids.add(process.pid);
+    writeFileSync(counterFilePath, JSON.stringify([...pids]));
+};
+
+describe('suite', () => {
+    it('case', (done) => {
+        updateCounterWithOwnPid();
+        setTimeout(done, 1000);
+    });
+});
diff --git a/test/subprocess-reuse/spec/4.spec.js b/test/subprocess-reuse/spec/4.spec.js
new file mode 100644
index 0000000..9258545
--- /dev/null
+++ b/test/subprocess-reuse/spec/4.spec.js
@@ -0,0 +1,17 @@
+const { writeFileSync } = require('fs');
+const { resolve } = require('path');
+
+const updateCounterWithOwnPid = () => {
+    const counterFilePath = resolve(__dirname, '../counter.json');
+    const pids = new Set(require(counterFilePath));
+
+    pids.add(process.pid);
+    writeFileSync(counterFilePath, JSON.stringify([...pids]));
+};
+
+describe('suite', () => {
+    it('case', (done) => {
+        updateCounterWithOwnPid();
+        setTimeout(done, 1000);
+    });
+});