Index: Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingCalculationActivityTest.cs
===================================================================
diff -u -r76948e8765899b35776102ecd211d3d7575a9e4d -r3ed8e00da47ef2780e79688a9902e12b674e4cc0
--- Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingCalculationActivityTest.cs	(.../PipingCalculationActivityTest.cs)	(revision 76948e8765899b35776102ecd211d3d7575a9e4d)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingCalculationActivityTest.cs	(.../PipingCalculationActivityTest.cs)	(revision 3ed8e00da47ef2780e79688a9902e12b674e4cc0)
@@ -97,13 +97,13 @@
             {
                 string[] msgs = messages.ToArray();
                 Assert.AreEqual(7, msgs.Length);
-                StringAssert.StartsWith(string.Format("Validatie van '{0}' gestart om: ", invalidPipingCalculation.Name), msgs.First());
+                Assert.AreEqual($"Validatie van '{invalidPipingCalculation.Name}' gestart.", msgs.First());
                 StringAssert.StartsWith("Validatie mislukt: ", msgs[1]);
                 StringAssert.StartsWith("Validatie mislukt: ", msgs[2]);
                 StringAssert.StartsWith("Validatie mislukt: ", msgs[3]);
                 StringAssert.StartsWith("Validatie mislukt: ", msgs[4]);
                 StringAssert.StartsWith("Validatie mislukt: ", msgs[5]);
-                StringAssert.StartsWith(string.Format("Validatie van '{0}' beëindigd om: ", invalidPipingCalculation.Name), msgs.Last());
+                Assert.AreEqual($"Validatie van '{invalidPipingCalculation.Name}' beëindigd.", msgs.Last());
             });
             Assert.AreEqual(ActivityState.Failed, activity.State);
             Assert.AreSame(originalOutput, invalidPipingCalculation.Output);
@@ -130,10 +130,10 @@
             {
                 string[] msgs = messages.ToArray();
                 Assert.AreEqual(4, msgs.Length);
-                StringAssert.StartsWith(string.Format("Validatie van '{0}' gestart om: ", validPipingCalculation.Name), msgs[0]);
-                StringAssert.StartsWith(string.Format("Validatie van '{0}' beëindigd om: ", validPipingCalculation.Name), msgs[1]);
-                StringAssert.StartsWith(string.Format("Berekening van '{0}' gestart om: ", validPipingCalculation.Name), msgs[2]);
-                StringAssert.StartsWith(string.Format("Berekening van '{0}' beëindigd om: ", validPipingCalculation.Name), msgs[3]);
+                Assert.AreEqual($"Validatie van '{validPipingCalculation.Name}' gestart.", msgs[0]);
+                Assert.AreEqual($"Validatie van '{validPipingCalculation.Name}' beëindigd.", msgs[1]);
+                Assert.AreEqual($"Berekening van '{validPipingCalculation.Name}' gestart.", msgs[2]);
+                Assert.AreEqual($"Berekening van '{validPipingCalculation.Name}' beëindigd.", msgs[3]);
             });
             Assert.AreEqual(ActivityState.Executed, activity.State);
             Assert.IsNotNull(validPipingCalculation.Output);