Use the JayWire framework for test -driven development: the best practice in the Java class library
Use the JayWire framework for test -driven development: the best practice in the Java class library
overview:
In modern Java development, Test-Driven Development (TDD) is becoming more and more popular with developers.TDD can help developers write more robust, maintenance and scalable code.In this article, we will introduce how to use the Jayware framework for TDD and the best practice in the development of Java libraries.
1. What is test driver development (TDD)?
Test driver development is a software development method. Among them, developers can write test cases first, and then write enough code to pass the test.This development method emphasizes the verified and automated testing to ensure that the code maintains correctness and stability throughout the development process.
2. Jaywire framework profile
Jaywire is a lightweight dependency injection (DI) framework (DI) framework, which helps us to achieve loose coupling code.In TDD, Jaywire can be used to create analog objects in order to better isolate the tested code.
3. Use jaywire to perform TDD steps
The following is the basic steps of using Jaywire for TDD:
a. Definition requirements and functions: First of all, we need to clear the needs and functions to transform it into testable scenes or use cases.
b. Define test cases: write test cases for requirements and functions to ensure coverage of various situations and boundary conditions.
c. Test failure: run test to ensure that all tests fail.
d. Writing the least code: Only write the minimum code that can pass one or more tests.
e. Operation test: Run the test again to ensure that the new code does not introduce new errors.
f. Reconstruction code: Reconstruction of the code to ensure the readability, maintenance, and scalability of the code.
g. Repeat the above steps: Repeat the above steps until all needs and functions are met.
4. Basic usage of jaywire
Below is the basic example of using Jayware to create analog object:
a. Add jaywire dependencies: In pom.xml file, add the following dependencies:
<dependency>
<groupId>org.kohsuke</groupId>
<artifactId>jaywire</artifactId>
<version>1.3</version>
</dependency>
b. Create interface and implementation classes: Define the implementation class of an interface and its corresponding implementation.For example, define an interface called "FOO" and its implementation class "FOOIMPL".
c. Create the JayWire module: Create a Java class and use the @ProvidedBy annotation to specify the implementation class.For example, create a class called "Foomodule":
import org.kohsuke.jaywire.ProvidedBy;
public class FooModule {
@ProvidedBy(FooImpl.class)
public static Foo getFoo() {
return new FooImpl();
}
}
d. Use analog objects: where you need to use an analog object, use the Inject method of jaywire to inject the analog object:
import org.kohsuke.jaywire.Injector;
public class MyTestClass {
private static Injector injector = new Injector(new FooModule());
public void myTestMethod() {
Foo foo = injector.inject(Foo.class);
// Use analog object ...
}
}
5. The best practice of TDD
In addition to using the JayWire framework, there are some best practices of TDD worth noting:
a. Writing simple test cases: Always start with a simple test case.Gradually increase complexity and ensure that each test case is only tested in one aspect.
b. Keep the independence of test cases: Make sure that each test case is independent and will not affect each other.
c. Frequent operation test: During the development process, the test is frequently operated to ensure that the new code will not destroy the existing functions.
d. Keep the readability of the code: write code that is easy to understand and maintain, and use clear variables and methods.
e. Reconstruction: As the demand changes, the code is constantly reconstructed to maintain the neatness and maintenance of the code.
in conclusion:
Test drive development (TDD) is a method that helps Java developers write high -quality code.Using the JayWire framework can better support the TDD and create an simulation object to isolate the tested code.In TDD, you also need to follow some best practices, such as writing simple test cases, independence of maintaining test cases, frequent operation testing, etc.By following these best practices, developers can build a reliable Java class library in a more efficient way.
