Commit 817d0f6d authored by George Adrian Stoica's avatar George Adrian Stoica
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fixes numbering error for 07-lecture

07-lecture needs to be named 08-lecture to match the actual number of lectures
parent 5fd95449
= Unit testing
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:LECTURE_TOPIC: Unit testing
:LECTURE_NO: 8th Lecture
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IT1901 Fall 2021 - {LECTURE_NO}
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== Testing
== 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 know, 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 4
``` 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
== JUnit 5
``` java
import org.junit.jupiter.api.*;
public class FoobarTest {
@BeforeAll
public static void setUpClass() throws Exception {
// Code executed before the first test method
}
@BeforeEach
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
}
@AfterEach
public void tearDown() throws Exception {
// Code executed after each test
}
@AfterAll
public static void tearDownClass() throws Exception {
// Code executed after the last test method
}
}
```
== JUnit 4 vs JUnit 5
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[%header,cols=3*]
|===
|Element
|JUnit 4
|JUnit 5
|package
|org.junit.*
|org.junit.jupiter.api.*
|code before first test
|@BeforeClass
|@BeforeAll
|code before each test
|@Before
|@BeforeEach
|test
|@Test
|@Test
|code after each test
|@After
|@AfterEach
|code after last test
|@AfterClass
|@AfterAll
|===
== JUnit 4 vs JUnit 5 (2)
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[%header,cols=3*]
|===
|Element
|JUnit 4
|JUnit 5
|ignoring test
|@Ignore
|@Disabled
|assertions *statically* accessed with
|`Assert.assert`...
|`Assertions.assert`...
|assertion messsage position
|in the beginning of argument list
|in the end of argument list
|===
== Expecting exceptions (1)
``` java
@Test
void testAssertingExpectedException() {
Assertions.assertThrows(<ExpectedException.class>, () -> {
<code expected to throw exception>;
});
}
```
== Expecting exceptions (2)
- if the code throws
** the exception class that is expected the the test will PASS
** a descendent class exception that is expected the the test will PASS
** a different exception type the test will FAIL
** throws no exception the test will FAIL
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== Testing in todo-list example
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