diff --git a/docs/FourierTransformsOfType1ChebyshevPolynomials.mw b/docs/FourierTransformsOfType1ChebyshevPolynomials.mw
index 7b25fb725..c6cf155e0 100644
--- a/docs/FourierTransformsOfType1ChebyshevPolynomials.mw
+++ b/docs/FourierTransformsOfType1ChebyshevPolynomials.mw
@@ -4,7 +4,7 @@
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@@ -84,14 +84,53 @@
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diff --git a/src/test/java/arb/expressions/ExpressionTest.java b/src/test/java/arb/expressions/ExpressionTest.java
index c688f4388..c11e79fad 100644
--- a/src/test/java/arb/expressions/ExpressionTest.java
+++ b/src/test/java/arb/expressions/ExpressionTest.java
@@ -29,6 +29,14 @@
public class ExpressionTest extends
TestCase
{
+ public static void testSimplificationOneTimesZero()
+ {
+ var f = RealNullaryFunction.parse("1*0");
+ f.simplify();
+ assertEquals(0.0, f.instantiate().evaluate(128).doubleValue());
+ assertEquals("0", f.toString());
+ }
+
public static void testSimplificationAConstantTimesOneIsTheConstant()
{
var f = RealNullaryFunction.parse("5*1");
@@ -95,7 +103,6 @@ public void testFourierTransformOfType1ChebyshevPolynomials()
assertEquals("-0.2897102277656836133548571248961385757265", eval.re().doubleValue());
assertTrue(eval.im().isZero());
- assert false : "Wtf";
}
public void testDerivative()
diff --git a/src/test/java/arb/expressions/nodes/DerivativeNodeTest.java b/src/test/java/arb/expressions/nodes/DerivativeNodeTest.java
new file mode 100644
index 000000000..d06a28b63
--- /dev/null
+++ b/src/test/java/arb/expressions/nodes/DerivativeNodeTest.java
@@ -0,0 +1,31 @@
+package arb.expressions.nodes;
+
+import arb.Real;
+import arb.documentation.BusinessSourceLicenseVersionOnePointOne;
+import arb.documentation.TheArb4jLibrary;
+import arb.expressions.Context;
+import arb.functions.real.RealFunction;
+import junit.framework.TestCase;
+
+/**
+ *
+ * @see BusinessSourceLicenseVersionOnePointOne © terms of the
+ * {@link TheArb4jLibrary}
+ */
+public class DerivativeNodeTest extends
+ TestCase
+{
+ public void testRealFunctionDerivative()
+ {
+ var context = new Context(Real.named("a").set(2),
+ Real.named("b").set(4),
+ Real.named("c").set(6));
+ var f = RealFunction.parse("x->a*x+b*x²+c*x³", context);
+ var derivative = f.rootNode.differentiate(f.independentVariable).simplify();
+ f.rootNode = derivative;
+ f.expression = derivative.toString();
+ var func = f.instantiate();
+ double val = func.eval(2.3);
+ assertEquals(115.61999999999998, val);
+ }
+}