BAEL-2983 java objects generation with EasyRandom (#7209)

easy-random/pom.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>easy-random</artifactId>
+    <name>easy-random</name>
+
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.jeasy</groupId>
+            <artifactId>easy-random-core</artifactId>
+            <version>4.0.0</version>
+        </dependency>
+    </dependencies>
+
+</project>

easy-random/src/main/java/org/baeldung/easy/random/model/Department.java

@@ -0,0 +1,17 @@
+package org.baeldung.easy.random.model;
+
+import java.util.StringJoiner;
+
+public class Department {
+    private String depName;
+
+    public Department(String depName) {
+        this.depName = depName;
+    }
+
+    @Override
+    public String toString() {
+        return new StringJoiner(", ", Department.class.getSimpleName() + "[", "]").add("depName='" + depName + "'")
+            .toString();
+    }
+}

easy-random/src/main/java/org/baeldung/easy/random/model/Employee.java

@@ -0,0 +1,70 @@
+package org.baeldung.easy.random.model;
+
+import java.util.*;
+
+public class Employee {
+
+    private long id;
+    private String firstName;
+    private String lastName;
+    private Department department;
+    private Collection<Employee> coworkers;
+    private Map<YearQuarter, Grade> quarterGrades;
+
+    public Employee(long id, String firstName, String lastName, Department department) {
+        this.id = id;
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.department = department;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+        Employee employee = (Employee) o;
+        return id == employee.id;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public Department getDepartment() {
+        return department;
+    }
+
+    public Collection<Employee> getCoworkers() {
+        return Collections.unmodifiableCollection(coworkers);
+    }
+
+    public Map<YearQuarter, Grade> getQuarterGrades() {
+        return Collections.unmodifiableMap(quarterGrades);
+    }
+
+    @Override
+    public String toString() {
+        return new StringJoiner(", ", Employee.class.getSimpleName() + "[", "]").add("id=" + id)
+            .add("firstName='" + firstName + "'")
+            .add("lastName='" + lastName + "'")
+            .add("department=" + department)
+            .add("coworkers size=" + ((coworkers == null) ? 0 : coworkers.size()))
+            .add("quarterGrades=" + quarterGrades)
+            .toString();
+    }
+}

easy-random/src/main/java/org/baeldung/easy/random/model/Grade.java

@@ -0,0 +1,22 @@
+package org.baeldung.easy.random.model;
+
+import java.util.StringJoiner;
+
+public class Grade {
+
+    private int grade;
+
+    public Grade(int grade) {
+        this.grade = grade;
+    }
+
+    public int getGrade() {
+        return grade;
+    }
+
+    @Override
+    public String toString() {
+        return new StringJoiner(", ", Grade.class.getSimpleName() + "[", "]").add("grade=" + grade)
+            .toString();
+    }
+}

easy-random/src/main/java/org/baeldung/easy/random/model/Person.java

@@ -0,0 +1,30 @@
+package org.baeldung.easy.random.model;
+
+import java.util.StringJoiner;
+
+public class Person {
+
+    private String firstName;
+    private String lastName;
+    private Integer age;
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    @Override
+    public String toString() {
+        return new StringJoiner(", ", Person.class.getSimpleName() + "[", "]").add("firstName='" + firstName + "'")
+            .add("lastName='" + lastName + "'")
+            .add("age=" + age)
+            .toString();
+    }
+}

easy-random/src/main/java/org/baeldung/easy/random/model/YearQuarter.java

@@ -0,0 +1,50 @@
+package org.baeldung.easy.random.model;
+
+import java.time.LocalDate;
+import java.util.Objects;
+import java.util.StringJoiner;
+
+public class YearQuarter {
+
+    private LocalDate startDate;
+    private LocalDate endDate;
+
+    public YearQuarter(LocalDate startDate) {
+        this.startDate = startDate;
+        autoAdjustEndDate();
+    }
+
+    private void autoAdjustEndDate() {
+        endDate = startDate.plusMonths(3L);
+    }
+
+    public LocalDate getStartDate() {
+        return startDate;
+    }
+
+    public LocalDate getEndDate() {
+        return endDate;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+        YearQuarter quarter = (YearQuarter) o;
+        return Objects.equals(startDate, quarter.startDate) && Objects.equals(endDate, quarter.endDate);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(startDate, endDate);
+    }
+
+    @Override
+    public String toString() {
+        return new StringJoiner(", ", YearQuarter.class.getSimpleName() + "[", "]").add("startDate=" + startDate)
+            .add("endDate=" + endDate)
+            .toString();
+    }
+}

easy-random/src/main/java/org/baeldung/easy/random/randomizer/YearQuarterRandomizer.java

@@ -0,0 +1,18 @@
+package org.baeldung.easy.random.randomizer;
+
+import org.baeldung.easy.random.model.YearQuarter;
+import org.jeasy.random.api.Randomizer;
+
+import java.time.LocalDate;
+import java.time.Month;
+
+public class YearQuarterRandomizer implements Randomizer<YearQuarter> {
+
+    private LocalDate date = LocalDate.of(1990, Month.SEPTEMBER, 25);
+
+    @Override
+    public YearQuarter getRandomValue() {
+        date = date.plusMonths(3);
+        return new YearQuarter(date);
+    }
+}

easy-random/src/test/java/org/baeldung/easy/random/EasyRandomUnitTest.java

@@ -0,0 +1,63 @@
+package org.baeldung.easy.random;
+
+import org.baeldung.easy.random.model.Employee;
+import org.baeldung.easy.random.model.Person;
+import org.baeldung.easy.random.model.YearQuarter;
+import org.baeldung.easy.random.randomizer.YearQuarterRandomizer;
+import org.jeasy.random.EasyRandom;
+import org.jeasy.random.EasyRandomParameters;
+import org.jeasy.random.FieldPredicates;
+import org.jeasy.random.TypePredicates;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class EasyRandomUnitTest {
+
+    @Test
+    void givenDefaultConfiguration_thenGenerateSingleObject() {
+        EasyRandom generator = new EasyRandom();
+        Person person = generator.nextObject(Person.class);
+
+        assertNotNull(person.getAge());
+        assertNotNull(person.getFirstName());
+        assertNotNull(person.getLastName());
+    }
+
+    @Test
+    void givenDefaultConfiguration_thenGenerateObjectsList() {
+        EasyRandom generator = new EasyRandom();
+        List<Person> persons = generator.objects(Person.class, 5)
+            .collect(Collectors.toList());
+
+        assertEquals(5, persons.size());
+    }
+
+    @Test
+    void givenCustomConfiguration_thenGenerateSingleEmployee() {
+        EasyRandomParameters parameters = new EasyRandomParameters();
+        parameters.stringLengthRange(3, 3);
+        parameters.collectionSizeRange(5, 5);
+        parameters.excludeField(FieldPredicates.named("lastName").and(FieldPredicates.inClass(Employee.class)));
+        parameters.excludeType(TypePredicates.inPackage("not.existing.pkg"));
+        parameters.randomize(YearQuarter.class, new YearQuarterRandomizer());
+
+        EasyRandom generator = new EasyRandom(parameters);
+        Employee employee = generator.nextObject(Employee.class);
+
+        assertEquals(3, employee.getFirstName().length());
+        assertEquals(5, employee.getCoworkers().size());
+        assertEquals(5, employee.getQuarterGrades().size());
+        assertNotNull(employee.getDepartment());
+
+        assertNull(employee.getLastName());
+
+        for (YearQuarter key : employee.getQuarterGrades().keySet()) {
+            assertEquals(key.getStartDate(), key.getEndDate().minusMonths(3L));
+        }
+    }
+
+}

pom.xml

@@ -422,6 +422,7 @@
                 <module>drools</module>
                 <module>dubbo</module>
 
+                <module>easy-random</module>
                 <module>ethereum</module>
 
                 <module>feign</module>