Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/MacroStabilityInwardsInputValidatorTest.cs
===================================================================
diff -u -re4e0e6f48ce1decab5f8a3831d8663abc1799fbb -r73bd43678d003eca592c2ce14a2500a983d9b4c9
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/MacroStabilityInwardsInputValidatorTest.cs	(.../MacroStabilityInwardsInputValidatorTest.cs)	(revision e4e0e6f48ce1decab5f8a3831d8663abc1799fbb)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/MacroStabilityInwardsInputValidatorTest.cs	(.../MacroStabilityInwardsInputValidatorTest.cs)	(revision 73bd43678d003eca592c2ce14a2500a983d9b4c9)
@@ -283,7 +283,6 @@
         public void Validate_SurfaceLineNear2DProfile_ReturnsEmpty(MacroStabilityInwardsSoilProfile2D soilProfile)
         {
             // Setup
-
             var surfaceLine = new MacroStabilityInwardsSurfaceLine("Test");
             surfaceLine.SetGeometry(new[]
             {
@@ -304,6 +303,64 @@
         }
 
         [Test]
+        public void Validate_ZoneBoundaryRightSmallerThanZoneBoundaryLeft_ReturnsError()
+        {
+            // Setup
+            input.ZoneBoundaryLeft = (RoundedDouble) 0.5;
+            input.ZoneBoundaryRight = (RoundedDouble) 0.2;
+
+            // Call
+            IEnumerable<string> messages = MacroStabilityInwardsInputValidator.Validate(input).ToArray();
+
+            // Assert
+            CollectionAssert.AreEqual(new[]
+            {
+                "Zoneringsgrens links moet kleiner zijn dan of gelijk zijn aan zoneringsgrens rechts."
+            }, messages);
+        }
+
+        [Test]
+        [SetCulture("nl-NL")]
+        [TestCase(0.1, 2)]
+        [TestCase(-2, 0.3)]
+        public void Validate_ZoneBoundariesOutsideSurfaceLine_ReturnsError(double zoneBoundaryLeft, double zoneBoundaryRight)
+        {
+            // Setup
+            input.ZoneBoundaryLeft = (RoundedDouble) zoneBoundaryLeft;
+            input.ZoneBoundaryRight = (RoundedDouble) zoneBoundaryRight;
+
+            // Call
+            IEnumerable<string> messages = MacroStabilityInwardsInputValidator.Validate(input).ToArray();
+
+            // Assert
+            CollectionAssert.AreEqual(new[]
+            {
+                "Zoneringsgrenzen moeten op het profiel liggen (bereik [0,0, 0,5])."
+            }, messages);
+        }
+
+        [Test]
+        [TestCase(MacroStabilityInwardsZoningBoundariesDeterminationType.Manual, false)]
+        [TestCase(MacroStabilityInwardsZoningBoundariesDeterminationType.Automatic, false)]
+        [TestCase(MacroStabilityInwardsZoningBoundariesDeterminationType.Automatic, true)]
+        public void Validate_ZoningBoundariesDeterminationTypeManualOrCreateZonesFalse_ReturnsEmpty(
+            MacroStabilityInwardsZoningBoundariesDeterminationType determinationType,
+            bool createZones)
+        {
+            // Setup
+            input.ZoneBoundaryLeft = (RoundedDouble) 1;
+            input.ZoneBoundaryRight = (RoundedDouble) 0.6;
+            input.ZoningBoundariesDeterminationType = determinationType;
+            input.CreateZones = createZones;
+
+            // Call
+            IEnumerable<string> messages = MacroStabilityInwardsInputValidator.Validate(input).ToArray();
+
+            // Assert
+            CollectionAssert.IsEmpty(messages);
+        }
+
+        [Test]
         public void Validate_MultipleTangentLinesWithTangentLineTopAndBottomSame_ReturnsError()
         {
             // Setup