diff --git a/.gitignore b/.gitignore
index 6cd7fe0..281d621 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,4 @@
 /target/
 .classpath
 .project
-/.settings
\ No newline at end of file
+/.settings
diff --git a/pom.xml b/pom.xml
index 0f6ec95..e2601d9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -18,4 +18,13 @@
 			</plugin>
 		</plugins>
 	</build>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-api</artifactId>
+			<version>5.10.2</version>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
 </project>
\ No newline at end of file
diff --git a/src/main/java/fr/diginamic/enumerations/Saison.java b/src/main/java/fr/diginamic/enumerations/Saison.java
index dbe9ebe..1628e4e 100644
--- a/src/main/java/fr/diginamic/enumerations/Saison.java
+++ b/src/main/java/fr/diginamic/enumerations/Saison.java
@@ -38,9 +38,6 @@ public static Saison valueOfLibelle(String libelle) {
 			if (libelle.equals(saison.getLibelle())) {
 				return saison;
 			}
-			else {
-				return null;
-			}
 		}
 		return null;
 	}
diff --git a/src/main/java/fr/diginamic/utils/StringUtils.java b/src/main/java/fr/diginamic/utils/StringUtils.java
index 7650bc6..b2c3ffe 100644
--- a/src/main/java/fr/diginamic/utils/StringUtils.java
+++ b/src/main/java/fr/diginamic/utils/StringUtils.java
@@ -1,5 +1,7 @@
 package fr.diginamic.utils;
 
+import org.w3c.dom.ls.LSOutput;
+
 /**
  * Classe qui fournit des services de traitements de chaines de caractères
  * 
@@ -14,9 +16,13 @@ public final class StringUtils {
 	 * @param rhs chaine 2
 	 * @return distance
 	 */
-	public static int levenshteinDistance(CharSequence lhs, CharSequence rhs) {
-		int len0 = lhs.length() + 1;
-		int len1 = rhs.length() + 1;
+	public static Integer levenshteinDistance(CharSequence lhs, CharSequence rhs) {
+		if (lhs == null || rhs == null) {
+			return -1;
+		}
+
+		int len0 = lhs.toString().trim().length() + 1;
+		int len1 = rhs.toString().trim().length() + 1;
 
 		int[] cost = new int[len0];
 		int[] newcost = new int[len0];
@@ -29,7 +35,7 @@ public static int levenshteinDistance(CharSequence lhs, CharSequence rhs) {
 			newcost[0] = j;
 
 			for (int i = 1; i < len0; i++) {
-				int match = (lhs.charAt(i - 1) == rhs.charAt(j - 1)) ? 0 : 1;
+				int match = (lhs.toString().trim().charAt(i - 1) == rhs.toString().trim().charAt(j - 1)) ? 0 : 1;
 
 				int costReplace = cost[i - 1] + match;
 				int costInsert = cost[i] + 1;
diff --git a/src/test/java/fr/diginamic/enumerations/SaisonTest.java b/src/test/java/fr/diginamic/enumerations/SaisonTest.java
new file mode 100644
index 0000000..ec423c1
--- /dev/null
+++ b/src/test/java/fr/diginamic/enumerations/SaisonTest.java
@@ -0,0 +1,38 @@
+package fr.diginamic.enumerations;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class SaisonTest {
+
+    @BeforeAll
+    public static void setUpBeforAllTests() {
+        System.out.println("Befor all");
+    }
+
+    @BeforeEach
+    public void setUpBeforeEachTests() {
+        System.out.println("Before");
+    }
+
+    @Test
+    public void testValueOfLibelle() {
+        Saison resultat = Saison.valueOfLibelle("Hiver");
+        assertEquals(Saison.HIVER, resultat);
+    }
+
+    @AfterEach
+    public void tearDownAfterEachTests() {
+        System.out.println("After");
+    }
+
+    @AfterAll
+    public static void tearDownAfterAllTests() {
+        System.out.println("After all");
+    }
+}
diff --git a/src/test/java/fr/diginamic/utils/StringUtilsTest.java b/src/test/java/fr/diginamic/utils/StringUtilsTest.java
new file mode 100644
index 0000000..90b819d
--- /dev/null
+++ b/src/test/java/fr/diginamic/utils/StringUtilsTest.java
@@ -0,0 +1,40 @@
+package fr.diginamic.utils;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class StringUtilsTest {
+
+    @BeforeAll
+    public static void setUpBeforAllTests() {
+        System.out.println("Befor all");
+    }
+
+    @BeforeEach
+    public void setUpBeforeEachTests() {
+        System.out.println("Before");
+    }
+
+    @Test
+    public void testlevenshteinDistance() {
+
+        int resultat = StringUtils.levenshteinDistance("Hello", null);
+
+        assertEquals(-1, resultat);
+    }
+
+    @AfterEach
+    public void tearDownAfterEachTests() {
+        System.out.println("After");
+    }
+
+    @AfterAll
+    public static void tearDownAfterAllTests() {
+        System.out.println("After all");
+    }
+}