public void TestClearVariables() { ExpressionTree testTree = new ExpressionTree("A1+2"); testTree.SetVariable("A1", 32); testTree.SetVariable("B2", -3); testTree.SetVariable("C3", 2); Dictionary <string, double> variables = testTree.GetVariables(); Assert.That(3, Is.EqualTo(variables.Count), "Did not set variables in the expressionTree."); testTree.ClearVariables(); Assert.That(0, Is.EqualTo(variables.Count), "Did not clear variables in the expressionTree."); }