diff --git a/core/src/test/kotlin/io/timemates/backend/files/usecases/GetImageUseCaseTest.kt b/core/src/test/kotlin/io/timemates/backend/files/usecases/GetImageUseCaseTest.kt
new file mode 100644
index 00000000..c780a3e9
--- /dev/null
+++ b/core/src/test/kotlin/io/timemates/backend/files/usecases/GetImageUseCaseTest.kt
@@ -0,0 +1,65 @@
+package io.timemates.backend.files.usecases
+
+import io.mockk.coEvery
+import io.mockk.impl.annotations.MockK
+import io.mockk.junit5.MockKExtension
+import io.mockk.mockk
+import io.timemates.backend.files.repositories.FilesRepository
+import io.timemates.backend.files.types.File
+import kotlinx.coroutines.runBlocking
+import org.junit.jupiter.api.BeforeAll
+import org.junit.jupiter.api.TestInstance
+import org.junit.jupiter.api.extension.ExtendWith
+import org.junit.platform.commons.annotation.Testable
+import java.io.InputStream
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+@Testable
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+@ExtendWith(MockKExtension::class)
+class GetImageUseCaseTest {
+    @MockK
+    lateinit var filesRepository: FilesRepository
+
+    lateinit var useCase: GetImageUseCase
+
+    private val file = mockk<File.Image>()
+
+    private val inputStream = mockk<InputStream>()
+
+    @BeforeAll
+    fun before() {
+        useCase = GetImageUseCase(filesRepository)
+    }
+
+    @Test
+    fun `test get image`(): Unit = runBlocking {
+        // GIVEN
+        coEvery { filesRepository.retrieve(file) } returns inputStream
+
+        // WHEN
+        val result = useCase.execute(file)
+
+        // THEN
+        assertEquals(
+            expected = GetImageUseCase.Result.Success(inputStream),
+            actual = result
+        )
+    }
+
+    @Test
+    fun `test get not found result from get image`(): Unit = runBlocking {
+        // GIVEN
+        coEvery { filesRepository.retrieve(file) } returns null
+
+        // WHEN
+        val result = useCase.execute(file)
+
+        // THEN
+        assertEquals(
+            expected = GetImageUseCase.Result.NotFound,
+            actual = result
+        )
+    }
+}
\ No newline at end of file
diff --git a/core/src/test/kotlin/io/timemates/backend/files/usecases/UploadFileUseCaseTest.kt b/core/src/test/kotlin/io/timemates/backend/files/usecases/UploadFileUseCaseTest.kt
new file mode 100644
index 00000000..42b51167
--- /dev/null
+++ b/core/src/test/kotlin/io/timemates/backend/files/usecases/UploadFileUseCaseTest.kt
@@ -0,0 +1,81 @@
+package io.timemates.backend.files.usecases
+
+import com.timemates.backend.time.SystemTimeProvider
+import com.timemates.backend.validation.createOrThrow
+import com.timemates.random.SecureRandomProvider
+import io.mockk.coEvery
+import io.mockk.impl.annotations.MockK
+import io.mockk.junit5.MockKExtension
+import io.mockk.mockk
+import io.timemates.backend.files.repositories.FilesRepository
+import io.timemates.backend.files.types.FileType
+import io.timemates.backend.files.types.value.FileId
+import io.timemates.backend.testing.auth.testAuthContext
+import io.timemates.backend.testing.validation.createOrAssert
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.runBlocking
+import org.junit.jupiter.api.BeforeAll
+import org.junit.jupiter.api.TestInstance
+import org.junit.jupiter.api.extension.ExtendWith
+import org.junit.platform.commons.annotation.Testable
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+@Testable
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+@ExtendWith(MockKExtension::class)
+class UploadFileUseCaseTest {
+    @MockK
+    lateinit var filesRepository: FilesRepository
+
+    lateinit var useCase: UploadFileUseCase
+
+    private val randomProvider = SecureRandomProvider()
+
+    private val timeProvider = SystemTimeProvider()
+
+    private val fileType = mockk<FileType>()
+
+    private val inputStream = mockk<Flow<ByteArray>>()
+
+    private val fileId = FileId.createOrAssert("123")
+
+    private val exception = mockk<Exception>()
+
+    @BeforeAll
+    fun before() {
+        useCase = UploadFileUseCase(filesRepository, randomProvider, timeProvider)
+    }
+
+    @Test
+    fun `test upload file`(): Unit = runBlocking {
+        // GIVEN
+        coEvery { FileId.createOrThrow(randomProvider.randomHash(FileId.SIZE)) } returns fileId
+        coEvery { filesRepository.save(fileId, fileType, inputStream, timeProvider.provide()) } returns Unit
+        // WHEN
+        val result = testAuthContext { useCase.execute(fileType, inputStream) }
+
+        // THEN
+        assertEquals(
+            expected = UploadFileUseCase.Result.Success(fileId),
+            actual = result
+        )
+    }
+
+    @Test
+    fun `test failure of upload file`(): Unit = runBlocking {
+        // GIVEN
+        coEvery { FileId.createOrThrow(randomProvider.randomHash(FileId.SIZE)) } returns fileId
+        coEvery { filesRepository.remove(fileId) } returns Unit
+        coEvery { exception.printStackTrace() } throws exception
+
+        // WHEN
+        val result = testAuthContext { useCase.execute(fileType, inputStream) }
+
+        // THEN
+        assertEquals(
+            expected = UploadFileUseCase.Result.Failure,
+            actual = result
+        )
+    }
+}
\ No newline at end of file
diff --git a/core/src/test/kotlin/io/timemates/backend/auth/usecases/GetCurrentTimerSessionUseCaseTest.kt b/core/src/test/kotlin/io/timemates/backend/timers/usecases/sessions/GetCurrentTimerSessionUseCaseTest.kt
similarity index 95%
rename from core/src/test/kotlin/io/timemates/backend/auth/usecases/GetCurrentTimerSessionUseCaseTest.kt
rename to core/src/test/kotlin/io/timemates/backend/timers/usecases/sessions/GetCurrentTimerSessionUseCaseTest.kt
index a67b9659..84c07262 100644
--- a/core/src/test/kotlin/io/timemates/backend/auth/usecases/GetCurrentTimerSessionUseCaseTest.kt
+++ b/core/src/test/kotlin/io/timemates/backend/timers/usecases/sessions/GetCurrentTimerSessionUseCaseTest.kt
@@ -1,4 +1,4 @@
-package io.timemates.backend.auth.usecases
+package io.timemates.backend.timers.usecases.sessions
 
 import com.timemates.backend.time.SystemTimeProvider
 import com.timemates.backend.time.UnixTime
@@ -14,7 +14,6 @@ import io.timemates.backend.timers.repositories.TimersRepository
 import io.timemates.backend.timers.types.Timer
 import io.timemates.backend.timers.types.toTimer
 import io.timemates.backend.timers.types.value.TimerId
-import io.timemates.backend.timers.usecases.sessions.GetCurrentTimerSessionUseCase
 import io.timemates.backend.users.types.value.UserId
 import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.runBlocking