Add the User model and its repository.

src/main/java/space/kklochko/spring_rest_example/db/repositories/UserRepository.java

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+package space.kklochko.spring_rest_example.db.repositories;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.NoResultException;
+import jakarta.persistence.TypedQuery;
+import org.springframework.stereotype.Component;
+import space.kklochko.spring_rest_example.db.repositories.blocks.TransactionalInsert;
+import space.kklochko.spring_rest_example.db.repositories.blocks.TransactionalRemove;
+import space.kklochko.spring_rest_example.db.repositories.blocks.TransactionalUpdate;
+import space.kklochko.spring_rest_example.models.Token;
+import space.kklochko.spring_rest_example.models.User;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+@Component
+public class UserRepository {
+    public User read(String username) {
+        Optional<User> user = readAll()
+                .stream()
+                .filter(u -> u.getUsername().equals(username))
+                .findFirst();
+
+        return user.orElse(null);
+    }
+
+    public List<User> readAll() {
+        List<User> users = new ArrayList<>();
+
+	// password same as username
+        users.add(new User("admin", "ADMIN", "8c6976e5b5410415bde908bd4dee15dfb167a9c873fc4bb8a81f6f2ab448a918"));
+        users.add(new User("user", "USER", "04f8996da763b7a969b1028ee3007569eaf3a635486ddab211d512c85b9df8fb"));
+
+        return users;
+    }
+}
+

src/main/java/space/kklochko/spring_rest_example/models/User.java

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+package space.kklochko.spring_rest_example.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@AllArgsConstructor
+@Data
+public class User {
+    private String username;
+    private String role;
+    private String password;
+
+    public User() {
+        setUsername("");
+        setRole("");
+        setPassword("");
+    }
+}
+

src/test/groovy/space/kklochko/spring_rest_example/db/repositories/UserRepositorySpec.groovy

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+package space.kklochko.spring_rest_example.db.repositories
+
+import groovy.sql.Sql
+import jakarta.persistence.EntityManager
+import space.kklochko.spring_rest_example.config.factories.LoadDataBaseConfigFromEnvFile
+import space.kklochko.spring_rest_example.config.models.DataBaseConfig
+import space.kklochko.spring_rest_example.db.factories.DataBaseConnection
+import space.kklochko.spring_rest_example.db.factories.EntityManagerConnection
+import space.kklochko.spring_rest_example.models.Token
+import space.kklochko.spring_rest_example.models.User
+import spock.lang.Shared
+import spock.lang.Specification
+import spock.lang.Stepwise
+import spock.lang.Subject
+
+@Stepwise
+class UserRepositorySpec extends Specification {
+    def "Read one user"() {
+        given: "I have a repo"
+        @Subject
+        UserRepository repo = new UserRepository()
+
+        when: "reading the entry"
+        def result = repo.read(username)
+
+        then: "checking that the reading was successful"
+        result
+
+        and: "the user has a role"
+        with(result) {
+            getRole() == expectedRole
+            getPassword() == expectedPassword
+        }
+
+        where: "the expected data"
+        username || expectedRole | expectedPassword
+        "admin"  || "ADMIN"      | "8c6976e5b5410415bde908bd4dee15dfb167a9c873fc4bb8a81f6f2ab448a918"
+        "user"   || "USER"       | "04f8996da763b7a969b1028ee3007569eaf3a635486ddab211d512c85b9df8fb"
+    }
+
+    def "Read one user and check if exists"() {
+        given: "I have a repo"
+        @Subject
+        UserRepository repo = new UserRepository()
+
+        when: "reading the entry"
+        def result = repo.read(username)
+
+        then: "checking that the reading was successful"
+        isNull == (result == null)
+
+        where: "the expected data"
+        username || isNull
+        "admin"  || false
+        "user"   || false
+        "user2"  || true
+    }
+}
+