diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index bee8595..0ae9536 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -23,3 +23,8 @@ application {
     val isDevelopment: Boolean = project.ext.has("development")
     applicationDefaultJvmArgs = listOf("-Dio.ktor.development=$isDevelopment")
 }
+
+tasks.test {
+    useJUnit()
+    exclude("**/*$*.class")
+}
diff --git a/app/src/main/kotlin/com/stslex/plugins/auth/model/UnauthorizedError.kt b/app/src/main/kotlin/com/stslex/plugins/auth/model/UnauthorizedError.kt
index ce65d9d..75c608c 100644
--- a/app/src/main/kotlin/com/stslex/plugins/auth/model/UnauthorizedError.kt
+++ b/app/src/main/kotlin/com/stslex/plugins/auth/model/UnauthorizedError.kt
@@ -9,7 +9,7 @@ enum class UnauthorizedError(
 ) : ApiError {
     TOKEN(
         messageCode = 1,
-        message = "Token is Invalid or has been expired"
+        message = "Token is invalid or has expired"
     ),
     API_KEY(
         messageCode = 2,
diff --git a/app/src/test/kotlin/com/stslex/AppConfigTest.kt b/app/src/test/kotlin/com/stslex/AppConfigTest.kt
new file mode 100644
index 0000000..2230618
--- /dev/null
+++ b/app/src/test/kotlin/com/stslex/AppConfigTest.kt
@@ -0,0 +1,53 @@
+package com.stslex
+
+import com.typesafe.config.ConfigFactory
+import io.ktor.server.config.ApplicationConfigurationException
+import io.ktor.server.config.HoconApplicationConfig
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.Parameterized
+import kotlin.test.assertTrue
+
+@RunWith(Parameterized::class)
+class AppConfigTest(private val path: String) {
+
+    private val config = HoconApplicationConfig(ConfigFactory.load("application.conf"))
+
+    @Test
+    fun propertyExists() {
+        val result = if (path == "ktor.application.modules") {
+            getPropertyList(path).isNotEmpty()
+        } else {
+            getPropertyString(path).isNotBlank()
+        }
+        assertTrue(result, "$path should be present")
+    }
+
+    private fun getPropertyString(path: String): String = try {
+        config.property(path).getString()
+    } catch (exception: ApplicationConfigurationException) {
+        ""
+    }
+
+    private fun getPropertyList(path: String): List<String> = try {
+        config.property(path).getList()
+    } catch (exception: ApplicationConfigurationException) {
+        emptyList()
+    }
+
+    private companion object {
+        @JvmStatic
+        @Parameterized.Parameters(name = "{0}")
+        fun data(): Collection<Array<String>> = listOf(
+            arrayOf("ktor.deployment.port"),
+            arrayOf("ktor.deployment.host"),
+            arrayOf("ktor.application.modules"),
+            arrayOf("postgres.url"),
+            arrayOf("postgres.user"),
+            arrayOf("postgres.password"),
+            arrayOf("apiKey"),
+            arrayOf("jwt.auth.secret"),
+            arrayOf("jwt.unAuth.secret")
+        )
+    }
+}
diff --git a/app/src/test/kotlin/com/stslex/TestAppConfig.kt b/app/src/test/kotlin/com/stslex/TestAppConfig.kt
deleted file mode 100644
index 756a0a2..0000000
--- a/app/src/test/kotlin/com/stslex/TestAppConfig.kt
+++ /dev/null
@@ -1,77 +0,0 @@
-package com.stslex
-
-import com.typesafe.config.ConfigFactory
-import io.ktor.server.config.*
-import org.junit.Test
-import kotlin.test.assertTrue
-
-class TestAppConfig {
-
-    private val config = HoconApplicationConfig(ConfigFactory.load())
-
-    @Test
-    fun ktorDeploymentPort() {
-        val property = getPropertyString("ktor.deployment.port")
-        assertTrue(property.isNotBlank())
-    }
-
-    @Test
-    fun ktorDeploymentHost() {
-        val property = getPropertyString("ktor.deployment.host")
-        assertTrue(property.isNotBlank())
-    }
-
-    @Test
-    fun ktorApplicationModules() {
-        val property = getPropertyList("ktor.application.modules")
-        assertTrue(property.isNotEmpty())
-    }
-
-    @Test
-    fun postgresUrl() {
-        val property = getPropertyString("postgres.url")
-        assertTrue(property.isNotBlank())
-    }
-
-    @Test
-    fun postgresUser() {
-        val property = getPropertyString("postgres.user")
-        assertTrue(property.isNotBlank())
-    }
-
-    @Test
-    fun postgresPassword() {
-        val property = getPropertyString("postgres.password")
-        assertTrue(property.isNotBlank())
-    }
-
-    @Test
-    fun apiKey() {
-        val property = getPropertyString("apiKey")
-        assertTrue(property.isNotBlank())
-    }
-
-    @Test
-    fun jwtAuthSecret() {
-        val property = getPropertyString("jwt.auth.secret")
-        assertTrue(property.isNotBlank())
-    }
-
-    @Test
-    fun jwtUnAuthSecret() {
-        val property = getPropertyString("jwt.unAuth.secret")
-        assertTrue(property.isNotBlank())
-    }
-
-    private fun getPropertyString(path: String): String = try {
-        config.property(path).getString()
-    } catch (exception: ApplicationConfigurationException) {
-        ""
-    }
-
-    private fun getPropertyList(path: String): List<String> = try {
-        config.property(path).getList()
-    } catch (exception: ApplicationConfigurationException) {
-        emptyList()
-    }
-}
\ No newline at end of file
diff --git a/app/src/test/resources/application.conf b/app/src/test/resources/application.conf
new file mode 100644
index 0000000..84aa69b
--- /dev/null
+++ b/app/src/test/resources/application.conf
@@ -0,0 +1,26 @@
+ktor {
+    deployment {
+        port = 8080
+        host = "0.0.0.0"
+    }
+    application {
+        modules = [ com.stslex.ApplicationKt.module ]
+    }
+}
+
+postgres {
+    url = "jdbc:h2:mem:test"
+    user = "user"
+    password = "password"
+}
+
+apiKey = "test-key"
+
+jwt {
+    auth {
+        secret = "auth-secret"
+    }
+    unAuth {
+        secret = "refresh-secret"
+    }
+}
diff --git a/documentation/documentation.yaml b/documentation/documentation.yaml
index f4b6fd5..b0a81e1 100644
--- a/documentation/documentation.yaml
+++ b/documentation/documentation.yaml
@@ -9,6 +9,7 @@ paths:
         - Test
       summary: Gets hello test string
       description: >
+        Returns a greeting message for test purposes.
       responses:
         '200':
-          description: OK
\ No newline at end of file
+          description: OK
diff --git a/feature/auth/src/main/kotlin/com/stslex/feature/auth/data/AuthRepositoryImpl.kt b/feature/auth/src/main/kotlin/com/stslex/feature/auth/data/AuthRepositoryImpl.kt
index 2b021de..a75b7f4 100644
--- a/feature/auth/src/main/kotlin/com/stslex/feature/auth/data/AuthRepositoryImpl.kt
+++ b/feature/auth/src/main/kotlin/com/stslex/feature/auth/data/AuthRepositoryImpl.kt
@@ -30,7 +30,7 @@ class AuthRepositoryImpl(
     override suspend fun getUser(
         login: String
     ): AuthUserDataModel? = userDataSource
-        .getUserByUsername(login)
+        .getUserByLogin(login)
         ?.toData()
 }