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I have a variable Object foo, which is not null. I want to use foo.bar, but only if it won't bomb me with 'No such property: bar for class: Whatever'.
How should I do the following test:
if (/*test-here*/) { use(foo.bar) } 
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Test a Groovy applicationPress Ctrl+Shift+T and select Create New Test. In the dialog that opens, specify your test settings and click OK. Open the test in the editor, add code and press Ctrl+Shift+F10 or right-click the test class and from the context menu select Run 'test name'.
An assertion is similar to an if, it verifies the expression you provide: if the expression is true it continues the execution to the next statement (and prints nothing), if the expression is false, it raises an AssertionError.
When a Groovy class definition declares a field without an access modifier, then a public setter/getter method pair and a private instance variable field is generated which is also known as "property" according to the JavaBeans specification.
Use object.hasProperty(propertyName). This will return a truthy value (the property reference) if the property exists. Also object.metaClass.hasProperty(instance, propertyName) is possible. Use object.respondsTo(methodName) to test for method existence.
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