diff --git a/test/unit/test-interval.js b/test/unit/test-interval.js
index fbda5ef..ac6ffac 100644
--- a/test/unit/test-interval.js
+++ b/test/unit/test-interval.js
@@ -17,39 +17,39 @@ describe('keep-alive interval', () => {
 
   it('should validate passed arguments', function () {
     ;(() => Lib.setKeepAliveInterval()).should.throw(
-      'setKeepAliveInterval requires two arguments'
+      /^setKeepAliveInterval requires two arguments/
     )
     ;(() => Lib.setKeepAliveInterval('')).should.throw(
-      'setKeepAliveInterval requires two arguments'
+      /^setKeepAliveInterval requires two arguments/
     )
     ;(() => Lib.setKeepAliveInterval('', '', '')).should.throw(
-      'setKeepAliveInterval requires two arguments'
+      /^setKeepAliveInterval requires two arguments/
     )
     ;(() => Lib.setKeepAliveInterval(null, 1)).should.throw(
-      'setKeepAliveInterval expects an instance of socket as its first argument'
+      /^setKeepAliveInterval expects an instance of socket as its first argument/
     )
     ;(() => Lib.setKeepAliveInterval({}, 1)).should.throw(
-      'setKeepAliveInterval expects an instance of socket as its first argument'
+      /^setKeepAliveInterval expects an instance of socket as its first argument/
     )
     ;(() => Lib.setKeepAliveInterval(new (class {})(), 1)).should.throw(
-      'setKeepAliveInterval expects an instance of socket as its first argument'
+      /^setKeepAliveInterval expects an instance of socket as its first argument/
     )
     ;(() => Lib.setKeepAliveInterval(new Stream.PassThrough(), 1)).should.throw(
-      'setKeepAliveInterval expects an instance of socket as its first argument'
+      /^setKeepAliveInterval expects an instance of socket as its first argument/
     )
 
     const socket = new Net.Socket()
     ;(() => Lib.setKeepAliveInterval(socket, null)).should.throw(
-      'setKeepAliveInterval requires msec to be a Number'
+      /^setKeepAliveInterval requires msec to be a Number/
     )
     ;(() => Lib.setKeepAliveInterval(socket, '')).should.throw(
-      'setKeepAliveInterval requires msec to be a Number'
+      /^setKeepAliveInterval requires msec to be a Number/
     )
     ;(() => Lib.setKeepAliveInterval(socket, true)).should.throw(
-      'setKeepAliveInterval requires msec to be a Number'
+      /^setKeepAliveInterval requires msec to be a Number/
     )
     ;(() => Lib.setKeepAliveInterval(socket, {})).should.throw(
-      'setKeepAliveInterval requires msec to be a Number'
+      /^setKeepAliveInterval requires msec to be a Number/
     )
   })
 
diff --git a/test/unit/test-probes.js b/test/unit/test-probes.js
index 4e31e31..bd2e644 100644
--- a/test/unit/test-probes.js
+++ b/test/unit/test-probes.js
@@ -17,39 +17,39 @@ describe('keep-alive probes', () => {
 
   it('should validate passed arguments', function () {
     ;(() => Lib.setKeepAliveProbes()).should.throw(
-      'setKeepAliveProbes requires two arguments'
+      /^setKeepAliveProbes requires two arguments/
     )
     ;(() => Lib.setKeepAliveProbes('')).should.throw(
-      'setKeepAliveProbes requires two arguments'
+      /^setKeepAliveProbes requires two arguments/
     )
     ;(() => Lib.setKeepAliveProbes('', '', '')).should.throw(
-      'setKeepAliveProbes requires two arguments'
+      /^setKeepAliveProbes requires two arguments/
     )
     ;(() => Lib.setKeepAliveProbes(null, 1)).should.throw(
-      'setKeepAliveProbes expects an instance of socket as its first argument'
+      /^setKeepAliveProbes expects an instance of socket as its first argument/
     )
     ;(() => Lib.setKeepAliveProbes({}, 1)).should.throw(
-      'setKeepAliveProbes expects an instance of socket as its first argument'
+      /^setKeepAliveProbes expects an instance of socket as its first argument/
     )
     ;(() => Lib.setKeepAliveProbes(new (class {})(), 1)).should.throw(
-      'setKeepAliveProbes expects an instance of socket as its first argument'
+      /^setKeepAliveProbes expects an instance of socket as its first argument/
     )
     ;(() => Lib.setKeepAliveProbes(new Stream.PassThrough(), 1)).should.throw(
-      'setKeepAliveProbes expects an instance of socket as its first argument'
+      /^setKeepAliveProbes expects an instance of socket as its first argument/
     )
 
     const socket = new Net.Socket()
     ;(() => Lib.setKeepAliveProbes(socket, null)).should.throw(
-      'setKeepAliveProbes requires cnt to be a Number'
+      /^setKeepAliveProbes requires cnt to be a Number/
     )
     ;(() => Lib.setKeepAliveProbes(socket, '')).should.throw(
-      'setKeepAliveProbes requires cnt to be a Number'
+      /^setKeepAliveProbes requires cnt to be a Number/
     )
     ;(() => Lib.setKeepAliveProbes(socket, true)).should.throw(
-      'setKeepAliveProbes requires cnt to be a Number'
+      /^setKeepAliveProbes requires cnt to be a Number/
     )
     ;(() => Lib.setKeepAliveProbes(socket, {})).should.throw(
-      'setKeepAliveProbes requires cnt to be a Number'
+      /^setKeepAliveProbes requires cnt to be a Number/
     )
   })
 
diff --git a/test/unit/test-timeout.js b/test/unit/test-timeout.js
index c3f1a0f..6876e28 100644
--- a/test/unit/test-timeout.js
+++ b/test/unit/test-timeout.js
@@ -18,39 +18,39 @@ describe('TCP User Timeout', () => {
   itSkipOS(
     ['freebsd'],'should validate passed arguments', function () {
     ;(() => Lib.setUserTimeout()).should.throw(
-      'setUserTimeout requires two arguments'
+      /^setUserTimeout requires two arguments/
     )
     ;(() => Lib.setUserTimeout('')).should.throw(
-      'setUserTimeout requires two arguments'
+      /^setUserTimeout requires two arguments/
     )
     ;(() => Lib.setUserTimeout('', '', '')).should.throw(
-      'setUserTimeout requires two arguments'
+      /^setUserTimeout requires two arguments/
     )
     ;(() => Lib.setUserTimeout(null, 1)).should.throw(
-      'setUserTimeout expects an instance of socket as its first argument'
+      /^setUserTimeout expects an instance of socket as its first argument/
     )
     ;(() => Lib.setUserTimeout({}, 1)).should.throw(
-      'setUserTimeout expects an instance of socket as its first argument'
+      /^setUserTimeout expects an instance of socket as its first argument/
     )
     ;(() => Lib.setUserTimeout(new (class {})(), 1)).should.throw(
-      'setUserTimeout expects an instance of socket as its first argument'
+      /^setUserTimeout expects an instance of socket as its first argument/
     )
     ;(() => Lib.setUserTimeout(new Stream.PassThrough(), 1)).should.throw(
-      'setUserTimeout expects an instance of socket as its first argument'
+      /^setUserTimeout expects an instance of socket as its first argument/
     )
 
     const socket = new Net.Socket()
     ;(() => Lib.setUserTimeout(socket, null)).should.throw(
-      'setUserTimeout requires msec to be a Number'
+      /^setUserTimeout requires msec to be a Number/
     )
     ;(() => Lib.setUserTimeout(socket, '')).should.throw(
-      'setUserTimeout requires msec to be a Number'
+      /^setUserTimeout requires msec to be a Number/
     )
     ;(() => Lib.setUserTimeout(socket, true)).should.throw(
-      'setUserTimeout requires msec to be a Number'
+      /^setUserTimeout requires msec to be a Number/
     )
     ;(() => Lib.setUserTimeout(socket, {})).should.throw(
-      'setUserTimeout requires msec to be a Number'
+      /^setUserTimeout requires msec to be a Number/
     )
   })