Obvious way is to manually test it at runtime. Any dependencies that are not set will throw a NullPointerException.
Another, and more robust, way is to annotate the setter method in your class with Spring's @Required annotation. This will produce an explicit Warning in your StdErr output stating that a required dependency has not been provided.
From the javadoc:
Interface to be implemented by beans that need to react once all their properties have been set by a BeanFactory: for example, to perform custom initialization, or merely to check that all mandatory properties have been set.
many of springs in-build classes use it to check if mandatory properties are set