diff --git a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/Rule.java b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/Rule.java
index a314a7f..fccd941 100644
--- a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/Rule.java
+++ b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/Rule.java
@@ -26,7 +26,6 @@ package net.kemitix.checkstyle.ruleset.builder;
 
 import lombok.Getter;
 import lombok.Setter;
-import lombok.ToString;
 
 import java.net.URI;
 import java.util.HashMap;
@@ -37,7 +36,6 @@ import java.util.Map;
  *
  * @author Paul Campbell (pcampbell@kemitix.net)
  */
-@ToString
 @Setter
 @Getter
 public class Rule {
@@ -85,5 +83,5 @@ public class Rule {
     /**
      * Configuration properties.
      */
-    private Map<String, String> properties = new HashMap<>();
+    private final Map<String, String> properties = new HashMap<>();
 }
diff --git a/builder/src/test/java/net/kemitix/checkstyle/ruleset/builder/RuleTest.java b/builder/src/test/java/net/kemitix/checkstyle/ruleset/builder/RuleTest.java
new file mode 100644
index 0000000..8dd535c
--- /dev/null
+++ b/builder/src/test/java/net/kemitix/checkstyle/ruleset/builder/RuleTest.java
@@ -0,0 +1,79 @@
+package net.kemitix.checkstyle.ruleset.builder;
+
+import lombok.val;
+import org.assertj.core.api.SoftAssertions;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.net.URI;
+
+/**
+ * Tests for {@link Rule}.
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net)
+ */
+public class RuleTest {
+
+    private Rule rule;
+
+    @Before
+    public void setUp() throws Exception {
+        rule = new Rule();
+    }
+
+    @Test
+    public void setAndGet() throws Exception {
+        //given
+        val name = "name";
+        val parent = RuleParent.TREEWALKER;
+        val level = RuleLevel.LAYOUT;
+        val source = RuleSource.CHECKSTYLE;
+        val enabled = true;
+        val insuppressible = true;
+        val uri = URI.create("rule://name.md");
+        val reason = "reason";
+        val key = "key";
+        val value = "value";
+        //when
+        rule.setName(name);
+        rule.setParent(parent);
+        rule.setLevel(level);
+        rule.setSource(source);
+        rule.setEnabled(enabled);
+        rule.setInsuppressible(insuppressible);
+        rule.setUri(uri);
+        rule.setReason(reason);
+        rule.getProperties()
+            .put(key, value);
+        //then
+        SoftAssertions.assertSoftly(softly -> {
+            softly.assertThat(rule.getName())
+                  .as("set/getName()")
+                  .isEqualTo(name);
+            softly.assertThat(rule.getParent())
+                  .as("set/getParent()")
+                  .isEqualTo(parent);
+            softly.assertThat(rule.getLevel())
+                  .as("set/getLevel()")
+                  .isEqualTo(level);
+            softly.assertThat(rule.getSource())
+                  .as("set/getSource()")
+                  .isEqualTo(source);
+            softly.assertThat(rule.isEnabled())
+                  .as("set/isEnabled()")
+                  .isEqualTo(enabled);
+            softly.assertThat(rule.isInsuppressible())
+                  .as("set/isInsuppressible()")
+                  .isEqualTo(insuppressible);
+            softly.assertThat(rule.getUri())
+                  .as("set/getUri()")
+                  .isEqualTo(uri);
+            softly.assertThat(rule.getReason())
+                  .as("set/getReason()")
+                  .isEqualTo(reason);
+            softly.assertThat(rule.getProperties())
+                  .as("getProperties()")
+                  .containsEntry(key, value);
+        });
+    }
+}