diff --git a/.gitignore b/.gitignore
index 411536455..22fe6a733 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ work
 .factorypath
 .project
 /nbproject/
+.DS_Store
\ No newline at end of file
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 89c28a29b..8f62214e4 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -50,6 +50,15 @@ Run automated tests with multiple Java virtual machines in a development with th
 $ mvn clean -DforkCount=1C verify
 ```
 
+## Code formatting
+
+Code formatting is maintained by the `spotless` plugin.
+Format the code with the command:
+
+```
+$ mvn spotless:apply
+```
+
 ## Report an Issue
 
 Use the ["Report an issue" page](https://www.jenkins.io/participate/report-issue/redirect/#17120) to submit bug reports.
diff --git a/src/test/java/org/jenkinsci/plugins/badge/EmbeddableBadgeConfigTest.java b/src/test/java/org/jenkinsci/plugins/badge/EmbeddableBadgeConfigTest.java
new file mode 100644
index 000000000..f2b82e694
--- /dev/null
+++ b/src/test/java/org/jenkinsci/plugins/badge/EmbeddableBadgeConfigTest.java
@@ -0,0 +1,44 @@
+package org.jenkinsci.plugins.badge;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.hamcrest.MatcherAssert.*;
+
+import org.hamcrest.core.IsNull;
+import org.junit.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+public class EmbeddableBadgeConfigTest {
+    @Test
+    public void testConstructor() {
+        String id = "testId-constructor";
+        EmbeddableBadgeConfig embeddableBadgeConfig = new EmbeddableBadgeConfig(id);
+        assertThat(embeddableBadgeConfig.getID(), is(id));
+        assertThat(embeddableBadgeConfig.getSubject(), is(nullValue()));
+        assertThat(embeddableBadgeConfig.getStatus(), is(nullValue()));
+        assertThat(embeddableBadgeConfig.getAnimatedOverlayColor(), is(nullValue()));
+        assertThat(embeddableBadgeConfig.getLink(), is(nullValue()));
+        assertThat(embeddableBadgeConfig.getColor(), is(nullValue()));
+    }
+
+    @Test
+    public void testGetAnimatedOverlayColorBlueForRunning() {
+        EmbeddableBadgeConfig embeddableBadgeConfig = new EmbeddableBadgeConfig("testId-running-blue");
+        embeddableBadgeConfig.setStatus("running");
+        assertThat(embeddableBadgeConfig.getAnimatedOverlayColor(), is("blue"));
+    }
+
+    @ParameterizedTest
+    @CsvSource({
+        "failing,red",
+        "passing,brightgreen",
+        "unstable,yellow",
+        "aborted,aborted",
+        "running,blue"
+    })
+    public void testGetColor(String status, String expected) {
+        EmbeddableBadgeConfig embeddableBadgeConfig = new EmbeddableBadgeConfig("testId-status-" + status);
+        embeddableBadgeConfig.setStatus(status);
+        assertThat(embeddableBadgeConfig.getColor(), is(expected));
+    }
+}