jdummy

About Jdummy

Jdummy is the simplest library for creating test objects.

Jdummy provides capabilities:

• creation of complex objects
• protection against cyclic object instantiation
• fields' modifiers for more logical and contextual values
• creation and populate of collections

Easy to use:

Just call Jdummy.of(..)

class VeryBoringTest {
    // for example a service that doesn't like nullable fields in POJO
    private NullfobicService nullfobicService = new NullfobicService();
    
    void testNullphobicService() {
        User user = Jdummy.of(User.class); // all fields will be present
        Assertions.assertDoesNotThrow(() -> nullfobicService.save(user));
    }
}

or use junit5 extension

@ExtendWith(JdummyExtension.class)
class JdummyExtensionTest {

    @Test
    @JdummySource
    void generateInteger(Integer value) {
        Assertions.assertNotNull(value, "Value must be generated");
    }
}

Download

Maven

<dependency>
    <groupId>com.github.nmuzhichin</groupId>
    <artifactId>jdummy-core</artifactId>
    <version>1.1.0</version>
    <scope>test</scope>
</dependency>
<!-- For junit-jupiter extension -->
<dependency>
    <groupId>com.github.nmuzhichin</groupId>
    <artifactId>jdummy-junit5</artifactId>
    <version>1.1.0</version>
    <scope>test</scope>
</dependency>

Gradle

testImplementation 'com.github.nmuzhichin:jdummy-core:1.1.0'
// For junit-jupiter extension
testImplementation 'com.github.nmuzhichin:jdummy-junit5:1.1.0'

Advanced features

Cache

If you need to use a ready-made object to create an instance, just call Jdummy.putCache (...) before that.

Custom modifiers

Each subject area has its own characteristics, which can be reflected in the names of the fields and their values.

For this, Jdummy contains a ValueModifier type that is used to customize the values. You can declare your own ValueModifier type and write it to a custom META-INFO/services/com.github.nmuzhichin.jdummy.modifier.ValueModifier for loading by ServiceLoader.