diff --git a/build.gradle.kts b/build.gradle.kts
index 7fe021e..d42cab3 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -17,6 +17,12 @@ kotlin {
     }
     linuxX64()
 
+    sourceSets {
+        commonTest.dependencies {
+            implementation(libs.test)
+        }
+    }
+
     compilerOptions {
         freeCompilerArgs.add("-opt-in=kotlin.ExperimentalUnsignedTypes")
     }
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index bb704f3..7b812f8 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -3,3 +3,6 @@ kotlin = "2.1.20"
 
 [plugins]
 multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
+
+[libraries]
+test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
diff --git a/src/commonTest/kotlin/com/infendro/encoding/Base16.kt b/src/commonTest/kotlin/com/infendro/encoding/Base16.kt
new file mode 100644
index 0000000..87e6888
--- /dev/null
+++ b/src/commonTest/kotlin/com/infendro/encoding/Base16.kt
@@ -0,0 +1,33 @@
+package com.infendro.encoding
+
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+
+class `Base16 Test` {
+    val encoding: Encoding
+        get() = Base16
+
+    val `Hello World!` = ubyteArrayOf(
+        0x48U, 0x65U, 0x6cU, 0x6cU,
+        0x6fU, 0x20U, 0x57U, 0x6fU,
+        0x72U, 0x6cU, 0x64U, 0x21U,
+    )
+
+    @Test
+    fun `encode empty ByteArray`() {
+        val expected = ubyteArrayOf()
+        val actual = encoding.encode(ubyteArrayOf())
+        assertContentEquals(expected, actual)
+    }
+
+    @Test
+    fun `encode "Hello, World!"`() {
+        val expected = ubyteArrayOf(
+            0x34U, 0x38U, 0x36U, 0x35U, 0x36U, 0x63U, 0x36U, 0x63U,
+            0x36U, 0x66U, 0x32U, 0x30U, 0x35U, 0x37U, 0x36U, 0x66U,
+            0x37U, 0x32U, 0x36U, 0x63U, 0x36U, 0x34U, 0x32U, 0x31U,
+        )
+        val actual = encoding.encode(`Hello World!`)
+        assertContentEquals(expected, actual)
+    }
+}
diff --git a/src/commonTest/kotlin/com/infendro/encoding/Base2.kt b/src/commonTest/kotlin/com/infendro/encoding/Base2.kt
new file mode 100644
index 0000000..3b638e6
--- /dev/null
+++ b/src/commonTest/kotlin/com/infendro/encoding/Base2.kt
@@ -0,0 +1,42 @@
+package com.infendro.encoding
+
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+
+class `Base2 Test` {
+    val encoding: Encoding
+        get() = Base2
+
+    val `Hello World!` = ubyteArrayOf(
+        0x48U, 0x65U, 0x6cU, 0x6cU,
+        0x6fU, 0x20U, 0x57U, 0x6fU,
+        0x72U, 0x6cU, 0x64U, 0x21U,
+    )
+
+    @Test
+    fun `encode empty ByteArray`() {
+        val expected = ubyteArrayOf()
+        val actual = encoding.encode(ubyteArrayOf())
+        assertContentEquals(expected, actual)
+    }
+
+    @Test
+    fun `encode "Hello, World!"`() {
+        val expected = ubyteArrayOf(
+            0x30U, 0x31U, 0x30U, 0x30U, 0x31U, 0x30U, 0x30U, 0x30U,
+            0x30U, 0x31U, 0x31U, 0x30U, 0x30U, 0x31U, 0x30U, 0x31U,
+            0x30U, 0x31U, 0x31U, 0x30U, 0x31U, 0x31U, 0x30U, 0x30U,
+            0x30U, 0x31U, 0x31U, 0x30U, 0x31U, 0x31U, 0x30U, 0x30U,
+            0x30U, 0x31U, 0x31U, 0x30U, 0x31U, 0x31U, 0x31U, 0x31U,
+            0x30U, 0x30U, 0x31U, 0x30U, 0x30U, 0x30U, 0x30U, 0x30U,
+            0x30U, 0x31U, 0x30U, 0x31U, 0x30U, 0x31U, 0x31U, 0x31U,
+            0x30U, 0x31U, 0x31U, 0x30U, 0x31U, 0x31U, 0x31U, 0x31U,
+            0x30U, 0x31U, 0x31U, 0x31U, 0x30U, 0x30U, 0x31U, 0x30U,
+            0x30U, 0x31U, 0x31U, 0x30U, 0x31U, 0x31U, 0x30U, 0x30U,
+            0x30U, 0x31U, 0x31U, 0x30U, 0x30U, 0x31U, 0x30U, 0x30U,
+            0x30U, 0x30U, 0x31U, 0x30U, 0x30U, 0x30U, 0x30U, 0x31U,
+        )
+        val actual = encoding.encode(`Hello World!`)
+        assertContentEquals(expected, actual)
+    }
+}
diff --git a/src/commonTest/kotlin/com/infendro/encoding/Base32.kt b/src/commonTest/kotlin/com/infendro/encoding/Base32.kt
new file mode 100644
index 0000000..8b673f5
--- /dev/null
+++ b/src/commonTest/kotlin/com/infendro/encoding/Base32.kt
@@ -0,0 +1,33 @@
+package com.infendro.encoding
+
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+
+class `Base32 Test` {
+    val encoding: Encoding
+        get() = Base32
+
+    val `Hello World!` = ubyteArrayOf(
+        0x48U, 0x65U, 0x6cU, 0x6cU,
+        0x6fU, 0x20U, 0x57U, 0x6fU,
+        0x72U, 0x6cU, 0x64U, 0x21U,
+    )
+
+    @Test
+    fun `encode empty ByteArray`() {
+        val expected = ubyteArrayOf()
+        val actual = encoding.encode(ubyteArrayOf())
+        assertContentEquals(expected, actual)
+    }
+
+    @Test
+    fun `encode "Hello, World!"`() {
+        val expected = ubyteArrayOf(
+            0x4aU, 0x42U, 0x53U, 0x57U, 0x59U, 0x33U, 0x44U, 0x50U,
+            0x45U, 0x42U, 0x4cU, 0x57U, 0x36U, 0x34U, 0x54U, 0x4dU,
+            0x4dU, 0x51U, 0x51U, 0x51U, 0x3dU, 0x3dU, 0x3dU, 0x3dU,
+        )
+        val actual = encoding.encode(`Hello World!`)
+        assertContentEquals(expected, actual)
+    }
+}
diff --git a/src/commonTest/kotlin/com/infendro/encoding/Base64.kt b/src/commonTest/kotlin/com/infendro/encoding/Base64.kt
new file mode 100644
index 0000000..3fad608
--- /dev/null
+++ b/src/commonTest/kotlin/com/infendro/encoding/Base64.kt
@@ -0,0 +1,32 @@
+package com.infendro.encoding
+
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+
+class `Base64 Test` {
+    val encoding: Encoding
+        get() = Base64
+
+    val `Hello World!` = ubyteArrayOf(
+        0x48U, 0x65U, 0x6cU, 0x6cU,
+        0x6fU, 0x20U, 0x57U, 0x6fU,
+        0x72U, 0x6cU, 0x64U, 0x21U,
+    )
+
+    @Test
+    fun `encode empty ByteArray`() {
+        val expected = ubyteArrayOf()
+        val actual = encoding.encode(ubyteArrayOf())
+        assertContentEquals(expected, actual)
+    }
+
+    @Test
+    fun `encode "Hello, World!"`() {
+        val expected = ubyteArrayOf(
+            0x53U, 0x47U, 0x56U, 0x73U, 0x62U, 0x47U, 0x38U, 0x67U,
+            0x56U, 0x32U, 0x39U, 0x79U, 0x62U, 0x47U, 0x51U, 0x68U,
+        )
+        val actual = encoding.encode(`Hello World!`)
+        assertContentEquals(expected, actual)
+    }
+}
diff --git a/src/commonTest/kotlin/com/infendro/encoding/Base8.kt b/src/commonTest/kotlin/com/infendro/encoding/Base8.kt
new file mode 100644
index 0000000..9f69400
--- /dev/null
+++ b/src/commonTest/kotlin/com/infendro/encoding/Base8.kt
@@ -0,0 +1,34 @@
+package com.infendro.encoding
+
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+
+class `Base8 Test` {
+    val encoding: Encoding
+        get() = Base8
+
+    val `Hello World!` = ubyteArrayOf(
+        0x48U, 0x65U, 0x6cU, 0x6cU,
+        0x6fU, 0x20U, 0x57U, 0x6fU,
+        0x72U, 0x6cU, 0x64U, 0x21U,
+    )
+
+    @Test
+    fun `encode empty ByteArray`() {
+        val expected = ubyteArrayOf()
+        val actual = encoding.encode(ubyteArrayOf())
+        assertContentEquals(expected, actual)
+    }
+
+    @Test
+    fun `encode "Hello, World!"`() {
+        val expected = ubyteArrayOf(
+            0x32U, 0x32U, 0x30U, 0x36U, 0x32U, 0x35U, 0x35U, 0x34U,
+            0x33U, 0x33U, 0x30U, 0x36U, 0x37U, 0x34U, 0x34U, 0x30U,
+            0x32U, 0x35U, 0x36U, 0x36U, 0x37U, 0x35U, 0x36U, 0x32U,
+            0x33U, 0x33U, 0x30U, 0x36U, 0x32U, 0x30U, 0x34U, 0x31U,
+        )
+        val actual = encoding.encode(`Hello World!`)
+        assertContentEquals(expected, actual)
+    }
+}