feat: test ValidationUtil

Author: QuentinTournier40

pom.xml

@@ -58,6 +58,7 @@
 
         <!-- Dependency versions -->
         <httpcore5.version>5.3.4</httpcore5.version>
+        <junit.version>5.13.0</junit.version>
         <lombok.version>1.18.38</lombok.version>
         <moshi.version>1.15.2</moshi.version>
     </properties>
@@ -79,7 +80,12 @@
             <version>${lombok.version}</version>
             <scope>provided</scope>
         </dependency>
-
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

src/test/java/dev/resms/util/ValidationUtilTest.java

@@ -0,0 +1,40 @@
+package dev.resms.util;
+
+import dev.resms.exception.ReSMSException;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class ValidationUtilTest {
+    @Test
+    void testValidatePhoneNumber_validNumber() {
+        assertDoesNotThrow(() -> ValidationUtil.validatePhoneNumber("+1234567890"));
+    }
+
+    @Test
+    void testValidatePhoneNumber_emptyNumber() {
+        ReSMSException ex = assertThrows(ReSMSException.class, () -> ValidationUtil.validatePhoneNumber("  "));
+        assertEquals("Phone number is required", ex.getMessage());
+    }
+
+    @Test
+    void testValidatePhoneNumber_invalidFormat() {
+        ReSMSException ex = assertThrows(ReSMSException.class,
+                () -> ValidationUtil.validatePhoneNumber("123abc"));
+        assertEquals("Invalid phone number format", ex.getMessage());
+    }
+
+    @Test
+    void testValidateMessage_validMessage() {
+        assertDoesNotThrow(() -> ValidationUtil.validateMessage("Hello!"));
+    }
+
+    @Test
+    void testValidateMessage_empty() {
+        ReSMSException ex = assertThrows(ReSMSException.class,
+                () -> ValidationUtil.validateMessage("   "));
+        assertEquals("Message cannot be empty", ex.getMessage());
+    }
+}