add JwtService

src/test/kotlin/ltd/hlaeja/service/JwtServiceTest.kt

@@ -0,0 +1,31 @@
+package ltd.hlaeja.service
+
+import java.util.UUID
+import kotlinx.coroutines.test.runTest
+import ltd.hlaeja.property.JwtProperty
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+
+class JwtServiceTest {
+
+    val property: JwtProperty = JwtProperty("keys/valid-private-key.pem")
+    lateinit var service: JwtService
+
+    @BeforeEach
+    fun setUp() {
+        service = JwtService(property)
+    }
+
+    @Test
+    fun `should generate a JWT successfully with a valid private key`() = runTest {
+        // given
+        val deviceId = UUID.fromString("00000000-0000-0000-0000-000000000000")
+
+        // when
+        val jwt = service.makeIdentity(deviceId)
+
+        // then
+        assertThat(jwt).contains("eyJkZXZpY2UiOiIwMDAwMDAwMC0wMDAwLTAwMDAtMDAwMC0wMDAwMDAwMDAwMDAifQ")
+    }
+}