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diff --git a/src/test/java/design/persistence/JSONPersonalDatabaseTest.java b/src/test/java/design/persistence/JSONPersonalDatabaseTest.java
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+++ b/src/test/java/design/persistence/JSONPersonalDatabaseTest.java
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+package design.persistence;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+
+import design.model.Golfer;
+
+/** Unit Tests for the JSON Personal Database Singleton
+ * @author Willem Dalton
+ **/
+@Tag("Persistence-tier")
+public class JSONPersonalDatabaseTest {
+    Path tempDB;
+
+    @BeforeEach
+    void clearDB() throws IOException
+    {
+        tempDB = Files.createTempFile("testdb", ".json");
+        Files.writeString(tempDB, "[]");
+        JSONPersonalDatabase.testInstance(tempDB.toString());
+    }
+    
+    @Test 
+    void testInstance()
+    {
+        JSONPersonalDatabase instance = JSONPersonalDatabase.instance(); // makes new instance
+        assertNotNull(instance);
+        JSONPersonalDatabase instance2 = JSONPersonalDatabase.instance(); // instance already exists
+        assertNotNull(instance2);
+    }
+
+    @Test
+    void testAddRemove() throws IOException
+    {
+        JSONPersonalDatabase instance = JSONPersonalDatabase.testInstance(tempDB.toString()); // makes new instance
+        Golfer testGolfer = new Golfer("Jamie Doe", "joe_cool", "12345");
+        instance.addGolfer(testGolfer);
+        assertEquals(testGolfer, instance.getGolfer("joe_cool"));
+        instance.removeGolfer(testGolfer);
+        assertEquals(null, instance.getGolfer("joe_cool"));
+    }
+
+    @Test
+    void testUpdateGolfer() throws IOException
+    {
+        JSONPersonalDatabase instance = JSONPersonalDatabase.testInstance(tempDB.toString()); // makes new instance
+        Golfer testGolfer = new Golfer("Jamie Doe", "joe_cool", "12345");
+        instance.addGolfer(testGolfer);
+        testGolfer.setUsername("joe_super_cool");
+        instance.updateGolfer(testGolfer);
+        assertEquals(testGolfer, instance.getGolfer("joe_super_cool"));
+    }
+}