diff --git a/ebean-core/src/test/java/io/ebeaninternal/server/json/PathStackTest.java b/ebean-core/src/test/java/io/ebeaninternal/server/json/PathStackTest.java
new file mode 100644
index 000000000..4112ede0f
--- /dev/null
+++ b/ebean-core/src/test/java/io/ebeaninternal/server/json/PathStackTest.java
@@ -0,0 +1,38 @@
+package io.ebeaninternal.server.json;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class PathStackTest {
+
+  @Test
+  void peekFullPath() {
+    var pathStack = new PathStack();
+    assertThat(pathStack.peekFullPath("foo")).isEqualTo("foo");
+
+    pathStack.push("one");
+    assertThat(pathStack.peekFullPath("foo")).isEqualTo("one.foo");
+    pathStack.push("two");
+    assertThat(pathStack.peekFullPath("foo")).isEqualTo("two.foo");
+
+    assertThat(pathStack.pop()).isEqualTo("two");
+    assertThat(pathStack.peekFullPath("foo")).isEqualTo("one.foo");
+    assertThat(pathStack.pop()).isEqualTo("one");
+    assertThat(pathStack.peekFullPath("foo")).isEqualTo("foo");
+  }
+
+  @Test
+  void pushPathKey() {
+    var pathStack = new PathStack();
+    assertThat(pathStack.peekFullPath("foo")).isEqualTo("foo");
+    pathStack.pushPathKey("one");
+    assertThat(pathStack.peekFullPath("foo")).isEqualTo("one.foo");
+    pathStack.pushPathKey("two");
+    assertThat(pathStack.peekFullPath("foo")).isEqualTo("one.two.foo");
+    pathStack.pop();
+    assertThat(pathStack.peekFullPath("foo")).isEqualTo("one.foo");
+    pathStack.pop();
+    assertThat(pathStack.peekFullPath("foo")).isEqualTo("foo");
+  }
+}