diff --git a/.idea/deploymentTargetSelector.xml b/.idea/deploymentTargetSelector.xml
index 5c91657..576e96c 100644
--- a/.idea/deploymentTargetSelector.xml
+++ b/.idea/deploymentTargetSelector.xml
@@ -5,13 +5,7 @@
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
       </SelectionState>
-      <SelectionState runConfigName="testOtpTextField">
-        <option name="selectionMode" value="DROPDOWN" />
-      </SelectionState>
-      <SelectionState runConfigName="preivewTimerText">
-        <option name="selectionMode" value="DROPDOWN" />
-      </SelectionState>
-      <SelectionState runConfigName="PreviewBaseTimerText">
+      <SelectionState runConfigName="EmailValidationTest">
         <option name="selectionMode" value="DROPDOWN" />
       </SelectionState>
     </selectionStates>
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 639c779..7b3006b 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -13,6 +13,7 @@
             <option value="$PROJECT_DIR$/app" />
           </set>
         </option>
+        <option name="resolveExternalAnnotations" value="false" />
       </GradleProjectSettings>
     </option>
   </component>
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 2cdc89a..f7608ed 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK" />
diff --git a/app/src/androidTest/java/com/example/netwrok_datastore/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/example/netwrok_datastore/ExampleInstrumentedTest.kt
index 263887c..d3e18f8 100644
--- a/app/src/androidTest/java/com/example/netwrok_datastore/ExampleInstrumentedTest.kt
+++ b/app/src/androidTest/java/com/example/netwrok_datastore/ExampleInstrumentedTest.kt
@@ -2,23 +2,39 @@ package com.example.netwrok_datastore
 
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.example.netwrok_datastore.domain.validator.EmailValidator
 
 import org.junit.Test
 import org.junit.runner.RunWith
 
 import org.junit.Assert.*
+import org.junit.runners.Parameterized
+import org.junit.runners.Parameterized.Parameters
 
 /**
  * Instrumented test, which will execute on an Android device.
  *
  * See [testing documentation](http://d.android.com/tools/testing).
  */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
+@RunWith(Parameterized::class)
+class EmailValidationTest(val email: String, val resultTest: Boolean) {
+
     @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.example.netwrok_datastore", appContext.packageName)
+    fun testValidationEmail(){
+
+        val result = EmailValidator().validate(email)
+        assertEquals(result, resultTest)
+    }
+
+
+    companion object{
+        @JvmStatic
+        @Parameters
+        fun getData() = listOf(
+            arrayOf("test", false),
+            arrayOf("@", false),
+            arrayOf("test@", true),
+            arrayOf("test.ru", false)
+        )
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/netwrok_datastore/domain/usecase/AuthUseCase.kt b/app/src/main/java/com/example/netwrok_datastore/domain/usecase/AuthUseCase.kt
index 4082c4e..742b634 100644
--- a/app/src/main/java/com/example/netwrok_datastore/domain/usecase/AuthUseCase.kt
+++ b/app/src/main/java/com/example/netwrok_datastore/domain/usecase/AuthUseCase.kt
@@ -4,6 +4,7 @@ import com.example.netwrok_datastore.data.AuthRepository
 import com.example.netwrok_datastore.data.local.LocalStorage
 import com.example.netwrok_datastore.data.remote.NetworkResponse
 import com.example.netwrok_datastore.data.remote.dto.request.RegistrationRequest
+import com.example.netwrok_datastore.domain.validator.EmailValidator
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow
 
@@ -13,6 +14,7 @@ class AuthUseCase(private val localStorage: LocalStorage,
    suspend fun registration(registrationRequest: RegistrationRequest): Flow<NetworkResponse> = flow{
          try {
              emit(NetworkResponse.Loading)
+             if (!EmailValidator().validate(registrationRequest.email)) emit(NetworkResponse.Error("Validation Error"))
             val result = authRepository.registration(registrationRequest)
             localStorage.setToken(result.second)
             emit(NetworkResponse.Success(result))
diff --git a/app/src/main/java/com/example/netwrok_datastore/domain/validator/EmailValidator.kt b/app/src/main/java/com/example/netwrok_datastore/domain/validator/EmailValidator.kt
new file mode 100644
index 0000000..c22c9ce
--- /dev/null
+++ b/app/src/main/java/com/example/netwrok_datastore/domain/validator/EmailValidator.kt
@@ -0,0 +1,8 @@
+package com.example.netwrok_datastore.domain.validator
+
+class EmailValidator: Validator {
+    override fun <T> validate(value: T): Boolean {
+        val email =  value as String
+        return email.contains("@")
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/netwrok_datastore/domain/validator/Validator.kt b/app/src/main/java/com/example/netwrok_datastore/domain/validator/Validator.kt
new file mode 100644
index 0000000..d814001
--- /dev/null
+++ b/app/src/main/java/com/example/netwrok_datastore/domain/validator/Validator.kt
@@ -0,0 +1,5 @@
+package com.example.netwrok_datastore.domain.validator
+
+interface Validator {
+    fun <T> validate(value: T): Boolean
+}
\ No newline at end of file