diff --git a/src/test/java/org/djunits/unit/si/SIRuntimeExceptionTest.java b/src/test/java/org/djunits/unit/si/SIRuntimeExceptionTest.java
index 3c5a581..80cf941 100644
--- a/src/test/java/org/djunits/unit/si/SIRuntimeExceptionTest.java
+++ b/src/test/java/org/djunits/unit/si/SIRuntimeExceptionTest.java
@@ -5,6 +5,7 @@
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
+import org.djunits.unit.SpeedUnit;
 import org.djunits.unit.Unit;
 import org.junit.Test;
 
@@ -84,6 +85,10 @@ public void testException()
     @Test
     public void testUnitGetUnit()
     {
+        assertTrue(Unit.getUnit("").getQuantity().getSiDimensions().equals(SIDimensions.DIMLESS));
+        assertTrue(Unit.getUnit("m/s").getQuantity().getSiDimensions()
+                .equals(SpeedUnit.METER_PER_SECOND.getQuantity().getSiDimensions()));
+
         try
         {
             Unit.getUnit(null);
@@ -94,16 +99,6 @@ public void testUnitGetUnit()
             assertTrue("Exception describes the parameter that has the problem", npe.getMessage().contains("unitString"));
         }
 
-        try
-        {
-            Unit.getUnit("");
-            fail("empty string should have thrown a IllegalArgumentException");
-        }
-        catch (IllegalArgumentException npe)
-        {
-            assertTrue("Exception describes the parameter that has the problem", npe.getMessage().contains("unitString"));
-        }
-
         try
         {
             Unit.getUnit("m.m.m.m");
diff --git a/src/test/java/org/djunits/value/vdouble/matrix/DoubleMatrixMethodTest.java b/src/test/java/org/djunits/value/vdouble/matrix/DoubleMatrixMethodTest.java
index dc32025..d41c07c 100644
--- a/src/test/java/org/djunits/value/vdouble/matrix/DoubleMatrixMethodTest.java
+++ b/src/test/java/org/djunits/value/vdouble/matrix/DoubleMatrixMethodTest.java
@@ -417,7 +417,7 @@ public void testMatrixMethods() throws ValueRuntimeException, UnitException
                         SIMatrix amDiv = am.divide(am2);
                         assertEquals("unit of m2 * m2 should be m4", "m4",
                                 amTim.getDisplayUnit().getQuantity().getSiDimensions().toString(false, false, false));
-                        assertEquals("unit of m2 / m2 should be 1", "1",
+                        assertEquals("unit of m2 / m2 should be empty string", "",
                                 amDiv.getDisplayUnit().getQuantity().getSiDimensions().toString(false, false, false));
                         for (int row = 0; row < testData.length; row++)
                         {