Add equals and toString tests for new classes

src/test/java/com/opencastsoftware/prettier4j/DocTest.java

@@ -841,7 +841,7 @@ void testEquals() {
                 .findFirst().get();
 
         // EqualsVerifier doesn't work with singletons,
-        // so we can't test Line, LineOrSpace, LineOrEmpty or Empty:
+        // so we can't test Reset, Line, LineOrSpace, LineOrEmpty or Empty:
         // it requires prefab values for recursive data types and
         // those prefab values must not be equal to each other
         EqualsVerifier

src/test/java/com/opencastsoftware/prettier4j/ansi/ColorTest.java

@@ -0,0 +1,24 @@
+/*
+ * SPDX-FileCopyrightText:  © 2024 Opencast Software Europe Ltd <https://opencastsoftware.com>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.opencastsoftware.prettier4j.ansi;
+
+import com.jparams.verifier.tostring.ToStringVerifier;
+import nl.jqno.equalsverifier.EqualsVerifier;
+import org.junit.jupiter.api.Test;
+
+public class ColorTest {
+    @Test
+    void testEquals() {
+        EqualsVerifier.forClasses(
+                Color.class, Color16.class,
+                Color256.class, ColorRgb.class)
+            .usingGetClass().verify();
+    }
+
+    @Test
+    void testToString() {
+        ToStringVerifier.forClasses(Color16.class, Color256.class, ColorRgb.class).verify();
+    }
+}

src/test/java/com/opencastsoftware/prettier4j/ansi/StylesTest.java

@@ -0,0 +1,23 @@
+package com.opencastsoftware.prettier4j.ansi;
+
+import com.jparams.verifier.tostring.ToStringVerifier;
+import nl.jqno.equalsverifier.EqualsVerifier;
+import org.junit.jupiter.api.Test;
+
+public class StylesTest {
+    @Test
+    void testEquals() {
+        EqualsVerifier.forClasses(Styles.Fg.class, Styles.Bg.class)
+                .usingGetClass()
+                .verify();
+    }
+
+    @Test
+    void testToString() {
+        ToStringVerifier.forClasses(
+                Styles.Fg.class, Styles.Bg.class, Styles.Bold.class,
+                Styles.Faint.class, Styles.Italic.class, Styles.Underline.class,
+                Styles.Blink.class, Styles.Inverse.class, Styles.Strikethrough.class)
+            .withIgnoredFields("shiftValue").verify();
+    }
+}