diff --git a/amethyst/build.gradle b/amethyst/build.gradle
index 435213034..c1acc5a08 100644
--- a/amethyst/build.gradle
+++ b/amethyst/build.gradle
@@ -293,6 +293,7 @@ dependencies {
 
     testImplementation libs.junit
     testImplementation libs.mockk
+    testImplementation libs.kotlinx.coroutines.test
 
     androidTestImplementation platform(libs.androidx.compose.bom)
     androidTestImplementation libs.androidx.junit
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/MediaCompressor.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/MediaCompressor.kt
index 1f4726898..6b7468c59 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/MediaCompressor.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/MediaCompressor.kt
@@ -160,7 +160,7 @@ class MediaCompressor {
         }
     }
 
-    fun from(
+    private fun from(
         uri: Uri?,
         contentType: String?,
         context: Context,
diff --git a/amethyst/src/test/java/com/vitorpamplona/amethyst/ui/components/MediaCompressorTest.kt b/amethyst/src/test/java/com/vitorpamplona/amethyst/ui/components/MediaCompressorTest.kt
new file mode 100644
index 000000000..d0ab42afd
--- /dev/null
+++ b/amethyst/src/test/java/com/vitorpamplona/amethyst/ui/components/MediaCompressorTest.kt
@@ -0,0 +1,132 @@
+/**
+ * Copyright (c) 2024 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.ui.components
+
+import android.net.Uri
+import android.os.Looper
+import com.abedelazizshe.lightcompressorlibrary.VideoCompressor
+import id.zelory.compressor.Compressor
+import io.mockk.MockKAnnotations
+import io.mockk.coEvery
+import io.mockk.coVerify
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkStatic
+import io.mockk.unmockkAll
+import io.mockk.verify
+import kotlinx.coroutines.test.runTest
+import org.junit.After
+import org.junit.Before
+import org.junit.Ignore
+import org.junit.Test
+import java.io.File
+
+class MediaCompressorTest {
+    @Before
+    fun setUp() {
+        // Mock compressors
+        mockkStatic(android.content.Context::class)
+        mockkStatic(VideoCompressor::class)
+        mockkStatic(Compressor::class)
+
+        // mock out main thread check
+        mockkStatic(Looper::class)
+        every { Looper.myLooper() } returns mockk<Looper>()
+        every { Looper.getMainLooper() } returns mockk<Looper>()
+        MockKAnnotations.init(this)
+    }
+
+    @After
+    fun tearDown() {
+        unmockkAll()
+    }
+
+    @Test
+    fun `Compression level uncompressed should not compress media`() =
+        runTest {
+            // setup
+            val mediaQuality = CompressorQuality.UNCOMPRESSED
+            val uri = mockk<Uri>()
+            val contentType = "video"
+
+            // Execution
+            MediaCompressor().compress(
+                uri,
+                contentType,
+                applicationContext = mockk(),
+                onReady = { _, _, _ -> },
+                onError = { },
+                mediaQuality = mediaQuality,
+            )
+
+            // Verify
+            verify(exactly = 0) { VideoCompressor.start(any(), any(), any(), any(), any(), any(), any()) }
+        }
+
+    @Test
+    fun `Video media should invoke video compressor`() =
+        runTest {
+            // setup
+            val mediaQuality = CompressorQuality.MEDIUM
+            val uri = mockk<Uri>()
+            val contentType = "video"
+
+            every { VideoCompressor.start(any(), any(), any(), any(), any(), any(), any()) } returns Unit
+
+            // Execution
+            MediaCompressor().compress(
+                uri,
+                contentType,
+                applicationContext = mockk(),
+                onReady = { _, _, _ -> },
+                onError = { },
+                mediaQuality = mediaQuality,
+            )
+
+            // Verify
+            verify(exactly = 1) { VideoCompressor.start(any(), any(), any(), any(), any(), any(), any()) }
+        }
+
+    @Test
+    @Ignore("Bug in mockk https://github.com/mockk/mockk/issues/944")
+    fun `Image media should invoke image compressor`() =
+        runTest {
+            // setup
+            val mediaQuality = CompressorQuality.MEDIUM
+            val uri = mockk<Uri>()
+            val contentType = "image"
+
+            coEvery { Compressor.compress(any(), any(), any(), any()) } returns File("test")
+
+            // Execution
+            MediaCompressor().compress(
+                uri,
+                contentType,
+                applicationContext = mockk(),
+                onReady = { _, _, _ -> },
+                onError = { },
+                mediaQuality = mediaQuality,
+            )
+
+            // Verify
+            coVerify(exactly = 0) { Compressor.compress(any(), any(), any(), any()) }
+        }
+}
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 1768d5ee9..437eab6e6 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -35,6 +35,7 @@ lightcompressor = "1.3.2"
 markdown = "077a2cde64"
 media3 = "1.4.1"
 mockk = "1.13.12"
+kotlinx-coroutines-test = "1.9.0-RC.2"
 navigationCompose = "2.8.1"
 okhttp = "5.0.0-alpha.14"
 runner = "1.6.2"
@@ -116,6 +117,7 @@ markdown-commonmark = { group = "com.github.vitorpamplona.compose-richtext", nam
 markdown-ui = { group = "com.github.vitorpamplona.compose-richtext", name = "richtext-ui", version.ref = "markdown" }
 markdown-ui-material3 = { group = "com.github.vitorpamplona.compose-richtext", name = "richtext-ui-material3", version.ref = "markdown" }
 mockk = { group = "io.mockk", name = "mockk", version.ref = "mockk" }
+kotlinx-coroutines-test = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-test", version.ref = "kotlinx-coroutines-test"}
 okhttp = { group = "com.squareup.okhttp3", name = "okhttp", version.ref = "okhttp" }
 rfc3986-normalizer = { group = "org.czeal", name = "rfc3986", version.ref = "rfc3986" }
 secp256k1-kmp-jni-android = { group = "fr.acinq.secp256k1", name = "secp256k1-kmp-jni-android", version.ref = "secp256k1KmpJniAndroid" }