JUnit Getting Started

Testing is very useful and helpful in descovering buges and it reduce the the development time (at least in my point of view) since all you need after modfying some code is to run your test cases which shouled be run also periodically.

The simplest way is as an expression in a debugger. You can change debug expressions without recompiling, and you can wait to decide what to write until you have seen the running objects. You can also write test expressions as statements which print to the standard output stream. Both styles of tests are limited because they require human judgment to analyze their results. Also, they don't compose nicely- you can only execute one debug expression at a time and a program with too many print statements causes the dreaded "Scroll Blindness".

JUnit tests do not require human judgment to interpret, and it is easy to run many of them at the same time. When you need to test something, here is what you do:

  1. Create an instance of TestCase:
  2. Create a constructor which accepts a String as a parameter and passes it to the superclass.
  3. Override the method runTest()
  4. When you want to check a value, call assertTrue() and pass a boolean that is true if the test succeeds

For example, to test that the sum of two Moneys with the same currency contains a value which is the sum of the values of the two Moneys, write:

Testing is very useful and helpful in descovering buges and it reduce the the development time (at least in my point of view) since all you need after modfying some code is to run your test cases which shouled be run also periodically.

The simplest way is as an expression in a debugger. You can change debug expressions without recompiling, and you can wait to decide what to write until you have seen the running objects. You can also write test expressions as statements which print to the standard output stream. Both styles of tests are limited because they require human judgment to analyze their results. Also, they don't compose nicely- you can only execute one debug expression at a time and a program with too many print statements causes the dreaded "Scroll Blindness".

JUnit tests do not require human judgment to interpret, and it is easy to run many of them at the same time. When you need to test something, here is what you do:

  1. Create an instance of TestCase:
  2. Create a constructor which accepts a String as a parameter and passes it to the superclass.
  3. Override the method runTest()
  4. When you want to check a value, call assertTrue() and pass a boolean that is true if the test succeeds

For example, to test that the sum of two Moneys with the same currency contains a value which is the sum of the values of the two Moneys, write:

public void testSimpleAdd()
{
Money m12CHF= new Money(12, "CHF");
Money m14CHF= new Money(14, "CHF");
Money expected= new Money(26, "CHF");
Money result= m12CHF.add(m14CHF);
assertTrue(expected.equals(result));
}

If you want to write a test similar to one you have already written, write a Fixture instead. When you want to run more than one test, create a Suite.

Fixture What if you have two or more tests that operate on the same or similar sets of objects? Test Case How do you write and invoke an individual test case when you have a Fixture? Suite How do you run several tests at once? TestRunner How do you run your tests and collect their results?

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