diff --git a/lisa/lisa-analyses/src/test/java/it/unive/lisa/analysis/string/tarsis/TrimTest.java b/lisa/lisa-analyses/src/test/java/it/unive/lisa/analysis/string/tarsis/TrimTest.java
index 34f7b690b..5faaa66fc 100644
--- a/lisa/lisa-analyses/src/test/java/it/unive/lisa/analysis/string/tarsis/TrimTest.java
+++ b/lisa/lisa-analyses/src/test/java/it/unive/lisa/analysis/string/tarsis/TrimTest.java
@@ -15,22 +15,31 @@ public void repeatSingleString() throws MathNumberConversionException {
 		RegexAutomaton epsilon = RegexAutomaton.string("");
 		RegexAutomaton abc_with_ws = RegexAutomaton.string("   a b c   ");
 		RegexAutomaton empty_star = RegexAutomaton.string("   ").star();
-
-		Tarsis a = new Tarsis(abc);
-		Tarsis b = new Tarsis(ws);
-		Tarsis c = new Tarsis(abc_with_ws);
-		Tarsis d = new Tarsis(empty_star);
+		RegexAutomaton comp1 = RegexAutomaton.string("   ").concat(RegexAutomaton.string(" abc"));
+		RegexAutomaton comp2 = RegexAutomaton.string(" a").concat(RegexAutomaton.string(" b "));
 
 		// "abc".trim() = "abc"
+		Tarsis a = new Tarsis(abc);
 		assertTrue(a.trim().getAutomaton().isEqualTo(abc));
 
 		// "   ".trim() = ""
+		Tarsis b = new Tarsis(ws);
 		assertTrue(b.trim().getAutomaton().isEqualTo(epsilon));
 
 		// "   a b c   ".trim() = "a b c"
+		Tarsis c = new Tarsis(abc_with_ws);
 		assertTrue(c.trim().getAutomaton().isEqualTo(RegexAutomaton.string("a b c")));
 
 		// ("   ")*.trim() = ""
+		Tarsis d = new Tarsis(empty_star);
 		assertTrue(d.trim().getAutomaton().isEqualTo(RegexAutomaton.emptyStr()));
+		
+		// "   " + " abc".trim() = "abc"
+		Tarsis e = new Tarsis(comp1);
+		assertTrue(e.trim().getAutomaton().isEqualTo(abc));
+		
+		// " a" + " b ".trim() = "a b "
+		Tarsis f = new Tarsis(comp2);
+		assertTrue(f.trim().getAutomaton().isEqualTo(RegexAutomaton.string("a b ")));
 	}
 }