diff --git a/matrix-sdk-android/src/test/java/im/vector/matrix/android/internal/crypto/verification/qrcode/BinaryStringTest.kt b/matrix-sdk-android/src/test/java/im/vector/matrix/android/internal/crypto/verification/qrcode/BinaryStringTest.kt
new file mode 100644
index 0000000000..df5499cb6f
--- /dev/null
+++ b/matrix-sdk-android/src/test/java/im/vector/matrix/android/internal/crypto/verification/qrcode/BinaryStringTest.kt
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.matrix.android.internal.crypto.verification.qrcode
+
+import org.amshove.kluent.shouldEqualTo
+import org.junit.FixMethodOrder
+import org.junit.Test
+import org.junit.runners.MethodSorters
+
+@FixMethodOrder(MethodSorters.JVM)
+class BinaryStringTest {
+
+    /**
+     * I want to put bytes to a String, and vice versa
+     */
+    @Test
+    fun testNominalCase() {
+        val byteArray = ByteArray(256)
+        for (i in byteArray.indices) {
+            byteArray[i] = i.toByte() // Random.nextInt(255).toByte()
+        }
+
+        val str = byteArray.toString(Charsets.ISO_8859_1)
+
+        str.length shouldEqualTo 256
+
+        // Ok convert back to bytearray
+
+        val result = str.toByteArray(Charsets.ISO_8859_1)
+
+        result.size shouldEqualTo 256
+
+        for (i in 0..255) {
+            result[i] shouldEqualTo i.toByte()
+            result[i] shouldEqualTo byteArray[i]
+        }
+    }
+}