Create Tests for SerializableMethod

Currently handled by community contributor Jaikiran Pai.

Need tests for the following:

• .equals() returns true if the name, className, returnType, and each of the argumentTypes are equal by value.
• .hashCode() follows the contract of .hashCode(), ie: if two objects are equal by value, they must have the same hashCode
• java.lang.reflect.Method > SerializableMethod > Method roundtrip returns with input equal by value to output given the same ClassLoader