Index: Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingCalculationsViewTest.cs
===================================================================
diff -u -rc4d2af65ad23757fb3bd11f93458839bc1787ded -r79545aa87d2fffbac4fc5b2aadb24db37270db8e
--- Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingCalculationsViewTest.cs	(.../PipingCalculationsViewTest.cs)	(revision c4d2af65ad23757fb3bd11f93458839bc1787ded)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingCalculationsViewTest.cs	(.../PipingCalculationsViewTest.cs)	(revision 79545aa87d2fffbac4fc5b2aadb24db37270db8e)
@@ -48,14 +48,18 @@
         private Form testForm;
 
         [SetUp]
-        public void Setup()
+        public override void Setup()
         {
+            base.Setup();
+
             testForm = new Form();
         }
 
         [TearDown]
-        public void TearDown()
+        public override void TearDown()
         {
+            base.TearDown();
+
             testForm.Dispose();
         }
 
@@ -423,6 +427,60 @@
         }
 
         [Test]
+        [TestCase("test", dampingFactorExitMeanColumnIndex)]
+        [TestCase("test", phreaticLevelExitMeanColumnIndex)]
+        [TestCase("test", entryPointLColumnIndex)]
+        [TestCase("test", exitPointLColumnIndex)]
+        [TestCase(";/[].,~!@#$%^&*()_-+={}|?", dampingFactorExitMeanColumnIndex)]
+        [TestCase(";/[].,~!@#$%^&*()_-+={}|?", phreaticLevelExitMeanColumnIndex)]
+        [TestCase(";/[].,~!@#$%^&*()_-+={}|?", entryPointLColumnIndex)]
+        [TestCase(";/[].,~!@#$%^&*()_-+={}|?", exitPointLColumnIndex)]
+        public void PipingCalculationsView_EditValueInvalid_ShowsErrorTooltip(string newValue, int cellIndex)
+        {
+            // Setup
+            ShowFullyConfiguredPipingCalculationsView();
+
+            var dataGridView = (DataGridView) new ControlTester("dataGridView").TheObject;
+
+            // Call
+            dataGridView.Rows[0].Cells[cellIndex].Value = newValue;
+
+            // Assert
+            Assert.AreEqual("De tekst moet een getal zijn.", dataGridView.Rows[0].ErrorText);
+        }
+
+        [Test]
+        [TestCase("1", dampingFactorExitMeanColumnIndex)]
+        [TestCase("1e-6", dampingFactorExitMeanColumnIndex)]
+        [TestCase("1e+6", dampingFactorExitMeanColumnIndex)]
+        [TestCase("14.3", dampingFactorExitMeanColumnIndex)]
+        [TestCase("1", phreaticLevelExitMeanColumnIndex)]
+        [TestCase("1e-6", phreaticLevelExitMeanColumnIndex)]
+        [TestCase("1e+6", phreaticLevelExitMeanColumnIndex)]
+        [TestCase("14.3", phreaticLevelExitMeanColumnIndex)]
+        [TestCase("1", entryPointLColumnIndex)]
+        [TestCase("1e-6", entryPointLColumnIndex)]
+        [TestCase("1e+6", entryPointLColumnIndex)]
+        [TestCase("14.3", entryPointLColumnIndex)]
+        [TestCase("1", exitPointLColumnIndex)]
+        [TestCase("1e-6", exitPointLColumnIndex)]
+        [TestCase("1e+6", exitPointLColumnIndex)]
+        [TestCase("14.3", exitPointLColumnIndex)]
+        public void FailureMechanismResultView_EditValueValid_DoNotShowErrorToolTipAndEditValue(string newValue, int cellIndex)
+        {
+            // Setup
+            ShowFullyConfiguredPipingCalculationsView();
+
+            var dataGridView = (DataGridView) new ControlTester("dataGridView").TheObject;
+
+            // Call
+            dataGridView.Rows[0].Cells[cellIndex].Value = newValue;
+
+            // Assert
+            Assert.IsEmpty(dataGridView.Rows[0].ErrorText);
+        }
+
+        [Test]
         public void ButtonGenerateScenarios_WithoutSurfaceLines_ButtonDisabled()
         {
             // Setup