Replace assert by simpler but equivalent calls.
diff --git a/src/test/java/org/apache/commons/ognl/TestOgnlRuntime.java b/src/test/java/org/apache/commons/ognl/TestOgnlRuntime.java
index 3ad0f6a..677ea2c 100644
--- a/src/test/java/org/apache/commons/ognl/TestOgnlRuntime.java
+++ b/src/test/java/org/apache/commons/ognl/TestOgnlRuntime.java
@@ -205,7 +205,7 @@
         SetterReturns root = new SetterReturns();
 
         Method m = OgnlRuntime.getWriteMethod( root.getClass(), "value" );
-        assertTrue( m != null );
+        assertNotNull(m);
 
         Ognl.setValue( "value", context, root, "12__" );
         assertEquals( Ognl.getValue( "value", context, root ), "12__" );
diff --git a/src/test/java/org/apache/commons/ognl/test/ASTPropertyTest.java b/src/test/java/org/apache/commons/ognl/test/ASTPropertyTest.java
index 76c8b63..bdc8feb 100644
--- a/src/test/java/org/apache/commons/ognl/test/ASTPropertyTest.java
+++ b/src/test/java/org/apache/commons/ognl/test/ASTPropertyTest.java
@@ -63,18 +63,18 @@
         context.setCurrentNode( pRef );
 
         assertEquals( root.getClass(), context.getCurrentType() );
-        assertEquals( null, context.getPreviousType() );
+        assertNull(context.getPreviousType());
         assertEquals( root, context.getCurrentObject() );
-        assertEquals( null, context.getCurrentAccessor() );
-        assertEquals( null, context.getPreviousAccessor() );
+        assertNull(context.getCurrentAccessor());
+        assertNull(context.getPreviousAccessor());
 
         int type = p.getIndexedPropertyType( context, root );
 
         assertEquals( OgnlRuntime.INDEXED_PROPERTY_NONE, type );
         assertEquals( root.getClass(), context.getCurrentType() );
-        assertEquals( null, context.getPreviousType() );
-        assertEquals( null, context.getCurrentAccessor() );
-        assertEquals( null, context.getPreviousAccessor() );
+        assertNull(context.getPreviousType());
+        assertNull(context.getCurrentAccessor());
+        assertNull(context.getPreviousAccessor());
     }
 
     public void test_Get_Value_Body()
@@ -95,18 +95,18 @@
         context.setCurrentNode( pRef );
 
         assertEquals( root.getClass(), context.getCurrentType() );
-        assertEquals( null, context.getPreviousType() );
+        assertNull(context.getPreviousType());
         assertEquals( root, context.getCurrentObject() );
-        assertEquals( null, context.getCurrentAccessor() );
-        assertEquals( null, context.getPreviousAccessor() );
+        assertNull(context.getCurrentAccessor());
+        assertNull(context.getPreviousAccessor());
 
         Object value = p.getValue( context, root );
 
         assertEquals( root.get( "nested" ), value );
         assertEquals( root.getClass(), context.getCurrentType() );
-        assertEquals( null, context.getPreviousType() );
-        assertEquals( null, context.getCurrentAccessor() );
-        assertEquals( null, context.getPreviousAccessor() );
+        assertNull(context.getPreviousType());
+        assertNull(context.getCurrentAccessor());
+        assertNull(context.getPreviousAccessor());
     }
 
     public void test_Get_Source()
@@ -130,14 +130,14 @@
         assertEquals( Object.class, context.getCurrentType() );
         assertEquals( Map.class, context.getCurrentAccessor() );
         assertEquals( root.getClass(), context.getPreviousType() );
-        assertEquals( null, context.getPreviousAccessor() );
+        assertNull(context.getPreviousAccessor());
 
         assertEquals( root.get( "nested" ), context.getCurrentObject() );
 
         assert Map.class.isAssignableFrom( context.getCurrentAccessor() );
 
         assertEquals( root.getClass(), context.getPreviousType() );
-        assertEquals( null, context.getPreviousAccessor() );
+        assertNull(context.getPreviousAccessor());
     }
 
     public void test_Set_Source()
@@ -164,7 +164,7 @@
         assert Map.class.isAssignableFrom( context.getCurrentAccessor() );
 
         assertEquals( root.getClass(), context.getPreviousType() );
-        assertEquals( null, context.getPreviousAccessor() );
+        assertNull(context.getPreviousAccessor());
     }
 
     public void test_Indexed_Object_Type()
@@ -206,7 +206,7 @@
         assertEquals( ".getList()", listp.toGetSourceString( context, root ) );
         assertEquals( List.class, context.getCurrentType() );
         assertEquals( Root.class, context.getCurrentAccessor() );
-        assertEquals( null, context.getPreviousAccessor() );
+        assertNull(context.getPreviousAccessor());
         assertEquals( root.getClass(), context.getPreviousType() );
         assertEquals( root.getList(), context.getCurrentObject() );
 
@@ -225,7 +225,7 @@
         assertEquals( ".getList()", chain.toGetSourceString( context, root ) );
         assertEquals( List.class, context.getCurrentType() );
         assertEquals( Root.class, context.getCurrentAccessor() );
-        assertEquals( null, context.getPreviousAccessor() );
+        assertNull(context.getPreviousAccessor());
         assertEquals( Root.class, context.getPreviousType() );
         assertEquals( root.getList(), context.getCurrentObject() );
 
diff --git a/src/test/java/org/apache/commons/ognl/test/ConstantTreeTest.java b/src/test/java/org/apache/commons/ognl/test/ConstantTreeTest.java
index 0f4723d..349a00d 100644
--- a/src/test/java/org/apache/commons/ognl/test/ConstantTreeTest.java
+++ b/src/test/java/org/apache/commons/ognl/test/ConstantTreeTest.java
@@ -24,6 +24,7 @@
 import java.util.ArrayList;
 import java.util.Collection;
 
+import junit.framework.Assert;
 import org.apache.commons.ognl.Ognl;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
@@ -77,7 +78,7 @@
     public void runTest()
         throws Exception
     {
-        assertTrue( Ognl.isConstant( getExpression(), _context ) == ( (Boolean) getExpectedResult() ).booleanValue() );
+        Assert.assertEquals(Ognl.isConstant(getExpression(), _context), ((Boolean) getExpectedResult()).booleanValue());
     }
 
     /*
diff --git a/src/test/java/org/apache/commons/ognl/test/NumericConversionTest.java b/src/test/java/org/apache/commons/ognl/test/NumericConversionTest.java
index 04209e4..a78d8fb 100644
--- a/src/test/java/org/apache/commons/ognl/test/NumericConversionTest.java
+++ b/src/test/java/org/apache/commons/ognl/test/NumericConversionTest.java
@@ -27,6 +27,7 @@
 import java.util.ArrayList;
 import java.util.Collection;
 
+import junit.framework.Assert;
 import org.apache.commons.ognl.OgnlException;
 import org.apache.commons.ognl.OgnlOps;
 import org.junit.Test;
@@ -213,7 +214,7 @@
                 double scalingFactor = Math.pow( 10, scale ), v1 = ( (Number) value ).doubleValue() * scalingFactor, v2 =
                     ( (Number) expectedValue ).doubleValue() * scalingFactor;
 
-                assertTrue( (int) v1 == (int) v2 );
+                Assert.assertEquals((int) v1, (int) v2);
             }
             else
             {
diff --git a/src/test/java/org/apache/commons/ognl/test/SimpleNavigationChainTreeTest.java b/src/test/java/org/apache/commons/ognl/test/SimpleNavigationChainTreeTest.java
index 23b0d93..a2171de 100644
--- a/src/test/java/org/apache/commons/ognl/test/SimpleNavigationChainTreeTest.java
+++ b/src/test/java/org/apache/commons/ognl/test/SimpleNavigationChainTreeTest.java
@@ -24,6 +24,7 @@
 import java.util.ArrayList;
 import java.util.Collection;
 
+import junit.framework.Assert;
 import org.apache.commons.ognl.Ognl;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -78,6 +79,6 @@
     public void runTest()
         throws Exception
     {
-        assertTrue( Ognl.isSimpleNavigationChain( getExpression(), _context ) == ( (Boolean) getExpectedResult() ).booleanValue() );
+        Assert.assertEquals(Ognl.isSimpleNavigationChain(getExpression(), _context), ((Boolean) getExpectedResult()).booleanValue());
     }
 }
diff --git a/src/test/java/org/apache/commons/ognl/test/SimplePropertyTreeTest.java b/src/test/java/org/apache/commons/ognl/test/SimplePropertyTreeTest.java
index debe179..989c3b8 100644
--- a/src/test/java/org/apache/commons/ognl/test/SimplePropertyTreeTest.java
+++ b/src/test/java/org/apache/commons/ognl/test/SimplePropertyTreeTest.java
@@ -24,6 +24,7 @@
 import java.util.ArrayList;
 import java.util.Collection;
 
+import junit.framework.Assert;
 import org.apache.commons.ognl.Ognl;
 import org.junit.Before;
 import org.junit.runner.RunWith;
@@ -78,6 +79,6 @@
     public void runTest()
         throws Exception
     {
-        assertTrue( Ognl.isSimpleProperty( getExpression(), _context ) == ( (Boolean) getExpectedResult() ).booleanValue() );
+        Assert.assertEquals(Ognl.isSimpleProperty(getExpression(), _context), ((Boolean) getExpectedResult()).booleanValue());
     }
 }
diff --git a/src/test/java/org/apache/commons/ognl/test/accessors/ListPropertyAccessorTest.java b/src/test/java/org/apache/commons/ognl/test/accessors/ListPropertyAccessorTest.java
index aeee9de..57738d7 100644
--- a/src/test/java/org/apache/commons/ognl/test/accessors/ListPropertyAccessorTest.java
+++ b/src/test/java/org/apache/commons/ognl/test/accessors/ListPropertyAccessorTest.java
@@ -56,7 +56,7 @@
         assertEquals( List.class, context.getCurrentAccessor() );
         assertEquals( Object.class, context.getCurrentType() );
         assertEquals( Integer.TYPE, context.getPreviousType() );
-        assertEquals( null, context.getPreviousAccessor() );
+        assertNull(context.getPreviousAccessor());
     }
 
     @Test
@@ -76,7 +76,7 @@
         assertEquals( List.class, context.getCurrentAccessor() );
         assertEquals( Object.class, context.getCurrentType() );
         assertEquals( Integer.class, context.getPreviousType() );
-        assertEquals( null, context.getPreviousAccessor() );
+        assertNull(context.getPreviousAccessor());
     }
 
     @Test
diff --git a/src/test/java/org/apache/commons/ognl/test/enhance/TestExpressionCompiler.java b/src/test/java/org/apache/commons/ognl/test/enhance/TestExpressionCompiler.java
index b3ddf7f..a28152c 100644
--- a/src/test/java/org/apache/commons/ognl/test/enhance/TestExpressionCompiler.java
+++ b/src/test/java/org/apache/commons/ognl/test/enhance/TestExpressionCompiler.java
@@ -242,7 +242,7 @@
         GenericRoot root = new GenericRoot();
 
         Node node = Ognl.compileExpression( _context, root, "cracker.param" );
-        assertEquals( null, node.getAccessor().get( _context, root ) );
+        assertNull(node.getAccessor().get(_context, root));
 
         node.getAccessor().set( _context, root, 0 );
         assertEquals( 0, node.getAccessor().get( _context, root ) );