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What is Unit Testing?

• references: https://martinfowler.com/bliki/UnitTest.html

Unit Testing key concepts

1. Interactions

While an interaction looks similar to a regular method invocation, it is simply a way to express which method invocations are expected to occur.

doSome is interaction.

class A {
   B b;

   String doSome() {
       Data bData = b.doSome()
       //domeSomething with bData
        return something;
   }
}

2. Interaction cardinality

how often a method call is expected, can be 0 or *.

class A {
   B b;

   String doSome() {
       Data bData = b.doSome(args1)
       Data cData = b.doSome(cargs1)
       //domeSomething with bData
        return something;
   }
}

3. Target cardinality

which dependency object is expected to receive the method call

4. Arguments constraints

class A {
   B b;
   C c;

   String doSome() {
       Data bData = b.doSome(args1)
       Data cData = c.doSome(cargs1)

       return bData + cData;
   }
}

• b.doSome is invoked with args1
• c.doSome is invoked with cargs1

Unit Testing Standards

https://github.com/prayagupa/java-tdd#ut-practices