Add users validation

api/test/unit/validation/RegisterValidationTest.kt

@@ -0,0 +1,57 @@
+package unit.validation
+
+import be.vandewalleh.entities.User
+import be.vandewalleh.validation.user.registerValidator
+import org.amshove.kluent.*
+import org.junit.jupiter.api.*
+import utils.firstInvalid
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class RegisterValidationTest {
+
+    @Test
+    fun `valid register test`() {
+        val violations = registerValidator.validate(User {
+            username = "hubert"
+            password = "definitelyNotMyPassword"
+            email = "test@mail.com"
+        })
+
+        violations.isValid `should be equal to` true
+    }
+
+    @Test
+    fun `invalid email test`() {
+        val violations = registerValidator.validate(User {
+            username = "hubert"
+            password = "definitelyNotMyPassword"
+            email = "teom"
+        })
+
+        violations.isValid `should be equal to` false
+        violations.firstInvalid `should be equal to` "email"
+    }
+
+    @Test
+    fun `missing email test`() {
+        val violations = registerValidator.validate(User {
+            username = "hubert"
+            password = "definitelyNotMyPassword"
+        })
+
+        violations.isValid `should be equal to` false
+        violations.firstInvalid `should be equal to` "email"
+    }
+
+    @Test
+    fun `username too long test`() {
+        val violations = registerValidator.validate(User {
+            username = "6X9iboWmEOWjVjkO328ReTJ1gGPTTmB/ZGgBLhB6EzAJoWkJht8"
+            password = "definitelyNotMyPassword"
+            email = "test@mail.com"
+        })
+
+        violations.isValid `should be equal to` false
+        violations.firstInvalid `should be equal to` "username"
+    }
+}