To some extent, it definitely is a Java problem. For instance, nothing is really stopping you from testing private Python methods. Meanwhile, one of the only ways to test a Java private method is through reflection.
That said, private methods are also a consequence of philosophical ideas like encapsulation and abstraction. In other words, we like to hide behavior to protect our users from making mistakes. As a result, testing becomes a bit more of a roundabout process.
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To some extent, it definitely is a Java problem. For instance, nothing is really stopping you from testing private Python methods. Meanwhile, one of the only ways to test a Java private method is through reflection.
That said, private methods are also a consequence of philosophical ideas like encapsulation and abstraction. In other words, we like to hide behavior to protect our users from making mistakes. As a result, testing becomes a bit more of a roundabout process.