* information about retake will be available after we check the exercises
== Group work
- prepare for delivery
- you submit the link to repo and the commit hash to evaluate
- report any group drop out cases - exercises are designed to work for 3-4 people
- we take into account the reduced numbers when grading
- test your deliverable in Eclipse Che
== Approaching Deadlines
- Torsdag, 19. september / 23:59
** 1st group deliverable
- Torsdag, 19. september / 23:59
** group contract
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== 2nd Group Exercise
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== Code quality
== Code quality
- testing
** automated tests
** +++
- coding standards and consistent formatting
- check for higher level types of errors (bug patterns)
- +++
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== Testing
== Crowdstrike incident 2024
* largest IT outage in history
* several billion USD in losses
* affected roughly 8.5 million systems
* bad test practices - happy path, no compatibility
* bad deployment practices
== Knight Capital Group (2012)
* technician forgot to copy the new version on one of the servers
* new version repurposed a flag that trigerred the olde version to send orders indefinitely
* 440 million USD lost
* lack of thorough regression testing
== Therac-25 - mid 80s
* radiation treatment cancer patients
* software issues - wrong dose
* caused 6 accidents, killed 3 patients
* bad design and development practices
* unfeasible to test properly and automate tests
== Testing
[%step]
- is an important part of software development
- a way to ensure software quality
- automated testing allows to develop new features with a minimal effort to check if the software still works as expected
- testing frameworks
== Testing (2)
[%step]
- design
- implement
- write automated tests
- run tests
- we do not test just for now, we write tests to keep running them during project life cycle
== Testing (3)
[%step]
- design tests
- implement the test
- provide inputs
- run the tests
- provide expected outputs
- check if the result we get matches what we expect
- produce a manageable output that the developer can consult
== Testing (3)
- design tests
- implement the test
- provide inputs
- *run the tests*
- provide expected outputs
- *check if the result we get matches what we expect*
- *produce a manageable output that the developer can consult*
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== JUnit
== JUnit
- Is a Java unit testing framework.
- provides the means to automate test
- allows to eliminate redundant testing tasks
== JUnit (2)
``` java
import org.junit.*;
public class FoobarTest {
@BeforeClass
public static void setUpClass() throws Exception {
// Code executed before the first test method
}
@Before
public void setUp() throws Exception {
// Code executed before each test
}
@Test
public void testOneThing() {
// Code that tests one thing
}
@Test
public void testAnotherThing() {
// Code that tests another thing
}
@Test
public void testSomethingElse() {
// Code that tests something else
}
@After
public void tearDown() throws Exception {
// Code executed after each test
}
@AfterClass
public static void tearDownClass() throws Exception {
// Code executed after the last test method
}
}
```
[.smaller-40]
https://en.wikipedia.org/wiki/JUnit
https://junit.org/junit5/docs/current/user-guide/
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== TestFX
== TestFX
- testing for JavaFx applications
- provides robots for UI testing
- support for JUnit
[.smaller-40]
https://github.com/TestFX/TestFX
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== Mockito
== Mockito
- mocking is a technique to test functionality in isolation
- mock objects simulate real objects
- return dummy values corresponding to the input given at creation
- Mockito uses reflection features in Java to create the mock objects
[.smaller-40]
https://site.mockito.org/
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== Jacoco
== JaCoCo (1)
- Java Code Coverage (JaCoCo)
- popular tool for measuring code coverage in Java projects
- measures several metrics
== Jacoco (2)
- tool for assessing code coverage
- does not need modifying code
- can produce a report in html format
- integrates with a number a tools including Gradle
[.smaller-40]
https://www.jacoco.org/
== JaCoCo metrics
- Instructions
- Branches (exception handling is excluded)
- Cyclomatic Complexity - "According to McCabe1996 cyclomatic complexity is the minimum number of paths that can, in (linear) combination, generate all possible paths through a method."
