diff --git a/builder/src/test/java/net/kemitix/checkstyle/ruleset/builder/BuilderConfigurationTest.java b/builder/src/test/java/net/kemitix/checkstyle/ruleset/builder/BuilderConfigurationTest.java
index 294cb87..9279196 100644
--- a/builder/src/test/java/net/kemitix/checkstyle/ruleset/builder/BuilderConfigurationTest.java
+++ b/builder/src/test/java/net/kemitix/checkstyle/ruleset/builder/BuilderConfigurationTest.java
@@ -4,8 +4,14 @@ import com.google.common.reflect.ClassPath;
 import org.junit.Test;
 
 import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Stream;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
 
 /**
  * Tests for {@link BuilderConfiguration}.
@@ -21,4 +27,21 @@ public class BuilderConfigurationTest {
         //then
         assertThat(classPath).isNotNull();
     }
+
+    @Test
+    public void canGetCheckClasses() {
+        //given
+        final PackageScanner packageScanner = mock(PackageScanner.class);
+        final String checkstyleClass = "checkstyle class";
+        given(packageScanner.apply(RuleSource.CHECKSTYLE)).willReturn(Stream.of(checkstyleClass));
+        final String sevntuClass = "sevntu class";
+        given(packageScanner.apply(RuleSource.SEVNTU)).willReturn(Stream.of(sevntuClass));
+        //when
+        final Map<RuleSource, List<String>> checkClasses = new BuilderConfiguration().checkClasses(packageScanner);
+        //then
+        assertThat(checkClasses).containsOnlyKeys(RuleSource.values());
+        assertThat(checkClasses)
+                .containsEntry(RuleSource.CHECKSTYLE, Collections.singletonList(checkstyleClass))
+                .containsEntry(RuleSource.SEVNTU, Collections.singletonList(sevntuClass));
+    }
 }