diff --git a/test/token/TokenFactoryTester.java b/test/token/TokenFactoryTester.java
index 15ea8f7..eeb61a6 100644
--- a/test/token/TokenFactoryTester.java
+++ b/test/token/TokenFactoryTester.java
@@ -54,12 +54,24 @@ public class TokenFactoryTester {
         assertTrue(createToken(text) instanceof Number);
     }
 
+    @Test
+    public void testPrefixedNumberCreation() {
+        String text = "-987";
+        assertTrue(createToken(text) instanceof Number);
+    }
+
     @Test
     public void testIdentifierCreation() {
         String text = "identifier";
         assertTrue(createToken(text) instanceof Identifier);
     }
 
+    @Test
+    public void testPrefixedIdentifierCreation() {
+        String text = "-identifier";
+        assertTrue(createToken(text) instanceof Identifier);
+    }
+
     @Test
     public void testStringCreation() {
         String text = "\"string\"";