diff --git a/CHANGELOG.md b/CHANGELOG.md
index 73a1e90..c633b69 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-_nothing changed yet_
+### Changed
+
+- Made things `virtual` for mocking purposes in other projects
 
 
 ## [v0.1.1] - 2025-10-24
diff --git a/src/FritzCallMonitor/CallMonitorClient.cs b/src/FritzCallMonitor/CallMonitorClient.cs
index 15d0282..2e8437c 100644
--- a/src/FritzCallMonitor/CallMonitorClient.cs
+++ b/src/FritzCallMonitor/CallMonitorClient.cs
@@ -51,12 +51,12 @@ namespace AMWD.Net.Api.Fritz.CallMonitor
 		/// <remarks>
 		/// The event provides details using the <see cref="CallMonitorEventArgs"/> parameter.
 		/// </remarks>
-		public event EventHandler<CallMonitorEventArgs>? OnEvent;
+		public virtual event EventHandler<CallMonitorEventArgs>? OnEvent;
 
 		/// <summary>
 		/// Gets or sets a logger instance.
 		/// </summary>
-		public ILogger? Logger
+		public virtual ILogger? Logger
 		{
 			get => _logger;
 			set
@@ -69,7 +69,7 @@ namespace AMWD.Net.Api.Fritz.CallMonitor
 		/// <summary>
 		/// Releases all resources used by the current instance of the <see cref="CallMonitorClient"/>.
 		/// </summary>
-		public void Dispose()
+		public virtual void Dispose()
 		{
 			if (_isDisposed)
 				return;
diff --git a/test/FritzCallMonitor.Tests/CallMonitorClientTest.cs b/test/FritzCallMonitor.Tests/CallMonitorClientTest.cs
index c1a328c..c9f747b 100644
--- a/test/FritzCallMonitor.Tests/CallMonitorClientTest.cs
+++ b/test/FritzCallMonitor.Tests/CallMonitorClientTest.cs
@@ -21,6 +21,7 @@ namespace FritzCallMonitor.Tests
 
 		private const string HOST = "localhost";
 		private const int PORT = 1012;
+		private readonly DateTime NOW = new(2025, 8, 25, 20, 15, 30, DateTimeKind.Local);
 
 		private string _dateOffset;
 
@@ -34,7 +35,7 @@ namespace FritzCallMonitor.Tests
 		[TestInitialize]
 		public void Initialize()
 		{
-			var offset = TimeZoneInfo.Local.GetUtcOffset(DateTime.Now);
+			var offset = TimeZoneInfo.Local.GetUtcOffset(NOW);
 			_dateOffset = offset < TimeSpan.Zero
 				? "-" + offset.ToString("hh\\:mm")
 				: "+" + offset.ToString("hh\\:mm");
@@ -43,7 +44,7 @@ namespace FritzCallMonitor.Tests
 
 			_readAsyncResponses = new Queue<(int, byte[])>();
 
-			_readAsyncResponses.Enqueue((0, Encoding.UTF8.GetBytes("25.08.25 20:15:30;RING;2;012345678901;9876543;SIP0;\r\n")));
+			_readAsyncResponses.Enqueue((0, Encoding.UTF8.GetBytes($"{NOW:dd.MM.yy HH:mm:ss};RING;2;012345678901;9876543;SIP0;\r\n")));
 			_readAsyncResponses.Enqueue((Timeout.Infinite, Array.Empty<byte>()));
 		}
 
@@ -184,7 +185,7 @@ namespace FritzCallMonitor.Tests
 		{
 			// Arrange
 			_readAsyncResponses.Clear();
-			_readAsyncResponses.Enqueue((0, Encoding.UTF8.GetBytes("25.08.25 20:15:30;RING;")));
+			_readAsyncResponses.Enqueue((0, Encoding.UTF8.GetBytes($"{NOW:dd.MM.yy HH:mm:ss};RING;")));
 			_readAsyncResponses.Enqueue((0, Encoding.UTF8.GetBytes("2;012345678901;9876543;SIP0;\n")));
 			_readAsyncResponses.Enqueue((Timeout.Infinite, Array.Empty<byte>()));
 
@@ -227,7 +228,7 @@ namespace FritzCallMonitor.Tests
 		{
 			// Arrange
 			_readAsyncResponses.Clear();
-			_readAsyncResponses.Enqueue((0, Encoding.UTF8.GetBytes("25.08.25 20:15:30;RING;2;012345678901;9876543;SIP0;\n25.08.25 20:15:30")));
+			_readAsyncResponses.Enqueue((0, Encoding.UTF8.GetBytes($"{NOW:dd.MM.yy HH:mm:ss};RING;2;012345678901;9876543;SIP0;\n{NOW:dd.MM.yy HH:mm:ss}")));
 			_readAsyncResponses.Enqueue((0, Encoding.UTF8.GetBytes(";RING;2;012345678901;9876543;SIP0;\r\n")));
 			_readAsyncResponses.Enqueue((Timeout.Infinite, Array.Empty<byte>()));
 
@@ -259,7 +260,7 @@ namespace FritzCallMonitor.Tests
 		{
 			// Arrange
 			_readAsyncResponses.Clear();
-			_readAsyncResponses.Enqueue((0, Encoding.UTF8.GetBytes("25.08.25 20:15:30;TEST;2;012345678901;9876543;SIP0;\n25.08.25 20:15:30")));
+			_readAsyncResponses.Enqueue((0, Encoding.UTF8.GetBytes($"{NOW:dd.MM.yy HH:mm:ss};TEST;2;012345678901;9876543;SIP0;\n{NOW:dd.MM.yy HH:mm:ss}")));
 			_readAsyncResponses.Enqueue((0, Encoding.UTF8.GetBytes(";RING;2;012345678901;9876543;SIP0;\r\n")));
 			_readAsyncResponses.Enqueue((Timeout.Infinite, Array.Empty<byte>()));
 
diff --git a/test/FritzCallMonitor.Tests/CallMonitorEventArgsTest.cs b/test/FritzCallMonitor.Tests/CallMonitorEventArgsTest.cs
index 22aa531..3714f76 100644
--- a/test/FritzCallMonitor.Tests/CallMonitorEventArgsTest.cs
+++ b/test/FritzCallMonitor.Tests/CallMonitorEventArgsTest.cs
@@ -8,10 +8,12 @@ namespace FritzCallMonitor.Tests
 	{
 		private string _dateOffset;
 
+		private readonly DateTime NOW = new(2025, 8, 25, 20, 15, 30, DateTimeKind.Local);
+
 		[TestInitialize]
 		public void Initialize()
 		{
-			var offset = TimeZoneInfo.Local.GetUtcOffset(DateTime.Now);
+			var offset = TimeZoneInfo.Local.GetUtcOffset(NOW);
 			_dateOffset = offset < TimeSpan.Zero
 				? "-" + offset.ToString("hh\\:mm")
 				: "+" + offset.ToString("hh\\:mm");
@@ -21,7 +23,7 @@ namespace FritzCallMonitor.Tests
 		public void ShouldParseRingEvent()
 		{
 			// Arrange
-			string line = "25.08.25 20:15:30;RING;2;012345678901;9876543;SIP0;";
+			string line = $"{NOW:dd.MM.yy HH:mm:ss};RING;2;012345678901;9876543;SIP0;";
 			var result = CallMonitorEventArgs.Parse(line);
 
 			Assert.IsNotNull(result);
@@ -37,7 +39,7 @@ namespace FritzCallMonitor.Tests
 		[TestMethod]
 		public void ShouldParseConnectEvent()
 		{
-			string line = "25.08.25 20:15:30;CONNECT;1;3;012345678901;";
+			string line = $"{NOW:dd.MM.yy HH:mm:ss};CONNECT;1;3;012345678901;";
 			var result = CallMonitorEventArgs.Parse(line);
 
 			Assert.IsNotNull(result);
@@ -53,7 +55,7 @@ namespace FritzCallMonitor.Tests
 		[TestMethod]
 		public void ShouldParseDisconnectEvent()
 		{
-			string line = "25.08.25 20:15:30;DISCONNECT;2;42;";
+			string line = $"{NOW:dd.MM.yy HH:mm:ss};DISCONNECT;2;42;";
 			var result = CallMonitorEventArgs.Parse(line);
 
 			Assert.IsNotNull(result);
@@ -69,7 +71,7 @@ namespace FritzCallMonitor.Tests
 		[TestMethod]
 		public void ShouldParseCallEvent()
 		{
-			string line = "25.08.25 20:15:30;CALL;4;7;9876543;012345678901;SIP0;";
+			string line = $"{NOW:dd.MM.yy HH:mm:ss};CALL;4;7;9876543;012345678901;SIP0;";
 			var result = CallMonitorEventArgs.Parse(line);
 
 			Assert.IsNotNull(result);
@@ -93,7 +95,7 @@ namespace FritzCallMonitor.Tests
 		[TestMethod]
 		public void ShouldReturnNullOnUnknownEventType()
 		{
-			string line = "25.08.25 20:15:30;UNKNOWN;2;012345678901;9876543;SIP0;";
+			string line = $"{NOW:dd.MM.yy HH:mm:ss};UNKNOWN;2;012345678901;9876543;SIP0;";
 			var result = CallMonitorEventArgs.Parse(line);
 			Assert.IsNull(result);
 		}
@@ -101,7 +103,7 @@ namespace FritzCallMonitor.Tests
 		[TestMethod]
 		public void ShouldReturnNullOnInvalidConnectionId()
 		{
-			string line = "25.08.25 20:15:30;RING;abc;012345678901;9876543;SIP0;";
+			string line = $"{NOW:dd.MM.yy HH:mm:ss};RING;abc;012345678901;9876543;SIP0;";
 			var result = CallMonitorEventArgs.Parse(line);
 			Assert.IsNull(result);
 		}
@@ -109,7 +111,7 @@ namespace FritzCallMonitor.Tests
 		[TestMethod]
 		public void ShouldHandleInvalidLinePortInConnect()
 		{
-			string line = "25.08.25 20:15:30;CONNECT;1;abc;012345678901;";
+			string line = $"{NOW:dd.MM.yy HH:mm:ss};CONNECT;1;abc;012345678901;";
 			var result = CallMonitorEventArgs.Parse(line);
 			Assert.IsNotNull(result);
 			Assert.IsNull(result.LinePort);
@@ -118,7 +120,7 @@ namespace FritzCallMonitor.Tests
 		[TestMethod]
 		public void ShouldHandleInvalidLinePortInCall()
 		{
-			string line = "25.08.25 20:15:30;CALL;4;abc;9876543;012345678901;SIP0;";
+			string line = $"{NOW:dd.MM.yy HH:mm:ss};CALL;4;abc;9876543;012345678901;SIP0;";
 			var result = CallMonitorEventArgs.Parse(line);
 			Assert.IsNotNull(result);
 			Assert.IsNull(result.LinePort);
@@ -127,7 +129,7 @@ namespace FritzCallMonitor.Tests
 		[TestMethod]
 		public void ShouldHandleInvalidDurationInDisconnect()
 		{
-			string line = "25.08.25 20:15:30;DISCONNECT;2;abc;";
+			string line = $"{NOW:dd.MM.yy HH:mm:ss};DISCONNECT;2;abc;";
 			var result = CallMonitorEventArgs.Parse(line);
 			Assert.IsNotNull(result);
 			Assert.IsNull(result.Duration);
@@ -136,7 +138,7 @@ namespace FritzCallMonitor.Tests
 		[TestMethod]
 		public void ShouldReturnNullOnTooFewColumns()
 		{
-			string line = "25.08.25 20:15:30;RING;";
+			string line = $"{NOW:dd.MM.yy HH:mm:ss};RING;";
 			var result = CallMonitorEventArgs.Parse(line);
 			Assert.IsNull(result);
 		}
@@ -144,7 +146,7 @@ namespace FritzCallMonitor.Tests
 		[TestMethod]
 		public void ShouldParseWithExtraColumns()
 		{
-			string line = "25.08.25 20:15:30;RING;2;012345678901;9876543;SIP0;EXTRA;COLUMN;";
+			string line = $"{NOW:dd.MM.yy HH:mm:ss};RING;2;012345678901;9876543;SIP0;EXTRA;COLUMN;";
 			var result = CallMonitorEventArgs.Parse(line);
 			Assert.IsNotNull(result);
 			Assert.AreEqual("012345678901", result.ExternalNumber);