diff --git a/README.md b/README.md
index 4e2f7ec..c82e7a4 100644
--- a/README.md
+++ b/README.md
@@ -4,4 +4,56 @@ Ledger Blue is not maintained anymore, but the app can still be compiled for thi
 
 This app follows the specification available in the `doc/` folder
 
-To compile it and load it on a device, have a look here: https://ledger.readthedocs.io/en/latest/userspace/getting_started.html
\ No newline at end of file
+To compile it and load it on a device, have a look here: https://ledger.readthedocs.io/en/latest/userspace/getting_started.html
+
+# Testing
+
+Testing is done via the open-source framework [zemu](https://github.com/Zondax/zemu).
+
+## Running tests
+
+First [install yarn](https://classic.yarnpkg.com/en/docs/install/#debian-stable).
+Then you can install the project by simply running:
+```
+make test
+```
+This will run `make install_tests` and `make run_tests`
+
+To run a specific tests (here the send test):
+```
+cd tests
+sudo jest --runInBand --detectOpenHandles src/send.test.js
+```
+
+Make sure you're in the `tests` folder before running `jest` or `yarn test`.
+
+
+## Adding tests
+
+### Zemu
+
+To add tests, copy one of the already existing test files in `tests/src/`.
+You then need to adapt the `buffer` and `tx` variables to adapt to the APDU you wish to send.
+
+- Adapt the expected screen flow. Please create a folder under `tests/snapshots` with the name of the test you're performing.
+- Then adapt the `ORIGINAL_SNAPSHOT_PATH_PREFIX` with the name of the folder you just created.
+- To create the snapshots, modify the `SNAPSHOT_PATH_PREFIX` and set it to be equal to `ORIGINAL_SNAPSHOT_PATH_PREFIX`.
+- Run the tests once, this will create all the snapshots in the folder you created.
+- Put back your `SNAPSHOT_PATH_PREFIX` to `snapshots/tmp/`.
+
+Finally make sure you adapt the expected signature!
+
+### Update binaries
+
+Don't forget to update the binaries in the test folder. To do so, compile with those environement variables:
+```
+make DEBUG=1 ALLOW_DATA=1
+```
+
+Then copy the binary to the `tests/elfs` folder (in this case, compiled with SDK for nanoS):
+```
+cp bin/app.elf tests/elfs/ethereum_nanos.elf
+```
+
+Repeat the operation for a binary compiled with nanoX SDK and change for `ethereum_nanox.elf`.
+
diff --git a/tests/snapshots/deposit/nanos/accept.png b/tests/snapshots/deposit/nanos/accept.png
new file mode 100644
index 0000000..3158ea6
Binary files /dev/null and b/tests/snapshots/deposit/nanos/accept.png differ
diff --git a/tests/snapshots/deposit/nanos/address_1.png b/tests/snapshots/deposit/nanos/address_1.png
new file mode 100644
index 0000000..49ba7bc
Binary files /dev/null and b/tests/snapshots/deposit/nanos/address_1.png differ
diff --git a/tests/snapshots/deposit/nanos/address_2.png b/tests/snapshots/deposit/nanos/address_2.png
new file mode 100644
index 0000000..4513833
Binary files /dev/null and b/tests/snapshots/deposit/nanos/address_2.png differ
diff --git a/tests/snapshots/deposit/nanos/address_3.png b/tests/snapshots/deposit/nanos/address_3.png
new file mode 100644
index 0000000..1707a8e
Binary files /dev/null and b/tests/snapshots/deposit/nanos/address_3.png differ
diff --git a/tests/snapshots/deposit/nanos/amount.png b/tests/snapshots/deposit/nanos/amount.png
new file mode 100644
index 0000000..37538c7
Binary files /dev/null and b/tests/snapshots/deposit/nanos/amount.png differ
diff --git a/tests/snapshots/deposit/nanos/data_present.png b/tests/snapshots/deposit/nanos/data_present.png
new file mode 100644
index 0000000..3bb21d5
Binary files /dev/null and b/tests/snapshots/deposit/nanos/data_present.png differ
diff --git a/tests/snapshots/deposit/nanos/fees.png b/tests/snapshots/deposit/nanos/fees.png
new file mode 100644
index 0000000..eafd4a2
Binary files /dev/null and b/tests/snapshots/deposit/nanos/fees.png differ
diff --git a/tests/snapshots/deposit/nanos/review.png b/tests/snapshots/deposit/nanos/review.png
new file mode 100644
index 0000000..2994983
Binary files /dev/null and b/tests/snapshots/deposit/nanos/review.png differ
diff --git a/tests/snapshots/deposit/nanox/accept.png b/tests/snapshots/deposit/nanox/accept.png
new file mode 100644
index 0000000..7f2b8c8
Binary files /dev/null and b/tests/snapshots/deposit/nanox/accept.png differ
diff --git a/tests/snapshots/deposit/nanox/address.png b/tests/snapshots/deposit/nanox/address.png
new file mode 100644
index 0000000..0c893f3
Binary files /dev/null and b/tests/snapshots/deposit/nanox/address.png differ
diff --git a/tests/snapshots/deposit/nanox/amount.png b/tests/snapshots/deposit/nanox/amount.png
new file mode 100644
index 0000000..1523569
Binary files /dev/null and b/tests/snapshots/deposit/nanox/amount.png differ
diff --git a/tests/snapshots/deposit/nanox/data_present.png b/tests/snapshots/deposit/nanox/data_present.png
new file mode 100644
index 0000000..8af206f
Binary files /dev/null and b/tests/snapshots/deposit/nanox/data_present.png differ
diff --git a/tests/snapshots/deposit/nanox/fees.png b/tests/snapshots/deposit/nanox/fees.png
new file mode 100644
index 0000000..559c155
Binary files /dev/null and b/tests/snapshots/deposit/nanox/fees.png differ
diff --git a/tests/snapshots/deposit/nanox/review.png b/tests/snapshots/deposit/nanox/review.png
new file mode 100644
index 0000000..8794afe
Binary files /dev/null and b/tests/snapshots/deposit/nanox/review.png differ
diff --git a/tests/src/approve.test.js b/tests/src/approve.test.js
index 0d804f8..579d252 100644
--- a/tests/src/approve.test.js
+++ b/tests/src/approve.test.js
@@ -6,7 +6,7 @@ import Zemu from "@zondax/zemu";
 import { TransportStatusError } from "@ledgerhq/errors";
 import { expect } from "../jest";
 
-const {NANOS_ELF_PATH, NANOX_ELF_PATH, sim_options_nanos, sim_options_nanox} = require("generic.js");
+const {NANOS_ELF_PATH, NANOX_ELF_PATH, sim_options_nanos, sim_options_nanox, TIMEOUT} = require("generic.js");
 
 const ORIGINAL_SNAPSHOT_PATH_PREFIX = "snapshots/approve/";
 const SNAPSHOT_PATH_PREFIX = "snapshots/tmp/";
@@ -19,7 +19,7 @@ const SNAPSHOT_PATH_NANOX = SNAPSHOT_PATH_PREFIX + "nanox/";
 
 
 test("Approve DAI tokens nanos", async () => {
-  jest.setTimeout(100000);
+  jest.setTimeout(TIMEOUT);
   const sim = new Zemu(NANOS_ELF_PATH);
 
   try {
@@ -105,7 +105,7 @@ test("Approve DAI tokens nanos", async () => {
 });
 
 test("Approve DAI token nanox", async () => {
-  jest.setTimeout(100000);
+  jest.setTimeout(TIMEOUT);
   const sim = new Zemu(NANOX_ELF_PATH);
 
   try {
diff --git a/tests/src/deposit.test.js b/tests/src/deposit.test.js
index 139bd0d..b024692 100644
--- a/tests/src/deposit.test.js
+++ b/tests/src/deposit.test.js
@@ -6,7 +6,7 @@ import Zemu from "@zondax/zemu";
 import { TransportStatusError } from "@ledgerhq/errors";
 import { expect } from "../jest";
 
-const {NANOS_ELF_PATH, NANOX_ELF_PATH, sim_options_nanos, sim_options_nanox} = require("generic.js");
+const {NANOS_ELF_PATH, NANOX_ELF_PATH, sim_options_nanos, sim_options_nanox, TIMEOUT} = require("generic.js");
 
 // Adapt this prefix.
 const ORIGINAL_SNAPSHOT_PATH_PREFIX = "snapshots/deposit/";
@@ -20,7 +20,7 @@ const SNAPSHOT_PATH_NANOX = SNAPSHOT_PATH_PREFIX + "nanox/";
 
 
 test("Deposit ETH nanos", async () => {
-  jest.setTimeout(100000);
+  jest.setTimeout(TIMEOUT);
   const sim = new Zemu(NANOS_ELF_PATH);
 
   try {
@@ -28,10 +28,12 @@ test("Deposit ETH nanos", async () => {
 
     let transport = await sim.getTransport();
 
-    let buffer = Buffer.from("058000002C8000003C800000010000000000000000F8914585055AE826008306599594CC9A0B7C43DC2A5F023BB9B738E45B0EF6B06E0487B1A2BC2EC50000B864474CF53D0000000000000000000000007D2768DE32B0B80B7A3454C06BDAC94A69DDC7A900000000000000000000000070BC641723FAD48BE2DF6CF63DC6270EE2F897430000000000000000000000000000000000", "hex");
-
-    // Send transaction
+    let buffer = Buffer.from("058000002c8000003c800000010000000000000000f8924685028fa6ae008306599594cc9a0b7c43dc2a5f023bb9b738e45b0ef6b06e0488016345785d8a0000b864474cf53d0000000000000000000000007d2768de32b0b80b7a3454c06bdac94a69ddc7a900000000000000000000000070bc641723fad48be2df6cf63dc6270ee2f8974300000000000000000000000000000000", "hex");
     let tx = transport.send(0xe0, 0x04, 0x00, 0x00, buffer);
+
+    buffer = Buffer.from("00000000000000000000000000000000018080", "hex");
+    tx = transport.send(0xe0, 0x04, 0x80, 0x00, buffer);
+
     let filename;
 
     await sim.waitUntilScreenIsNot(sim.getMainMenuSnapshot());
@@ -94,7 +96,7 @@ test("Deposit ETH nanos", async () => {
     await sim.clickBoth();
 
     await expect(tx).resolves.toEqual(
-      Buffer.from([ 38, 111, 56, 157, 21, 50, 15, 5, 1, 56, 53, 38, 237, 3, 222, 145, 124, 20, 33, 39, 22, 240, 154, 38, 45, 188, 152, 67, 16, 134, 165, 219, 73, 13, 201, 148, 183, 185, 114, 48, 187, 53, 253, 246, 254, 194, 244, 216, 255, 76, 251, 139, 254, 178, 166, 82, 195, 100, 199, 56, 255, 3, 60, 5, 221, 144, 0])
+      Buffer.from([38, 181, 174, 58, 1, 30, 181, 14, 125, 31, 233, 245, 230, 246, 217, 28, 169, 244, 223, 202, 95, 115, 128, 95, 196, 134, 109, 73, 231, 46, 173, 47, 92, 60, 110, 85, 219, 89, 37, 88, 107, 181, 142, 67, 75, 88, 178, 192, 71, 86, 246, 98, 19, 21, 151, 249, 140, 26, 162, 65, 139, 22, 153, 43, 129, 144, 0])
     );
   } finally {
     await sim.close();
@@ -102,17 +104,20 @@ test("Deposit ETH nanos", async () => {
 });
 
 test("Deposit ETH nanox", async () => {
-  jest.setTimeout(100000);
+  jest.setTimeout(TIMEOUT);
   const sim = new Zemu(NANOX_ELF_PATH);
 
   try {
     await sim.start(sim_options_nanox);
 
     let transport = await sim.getTransport();
-    let buffer = Buffer.from("058000002C8000003C800000010000000000000000F8914585055AE826008306599594CC9A0B7C43DC2A5F023BB9B738E45B0EF6B06E0487B1A2BC2EC50000B864474CF53D0000000000000000000000007D2768DE32B0B80B7A3454C06BDAC94A69DDC7A900000000000000000000000070BC641723FAD48BE2DF6CF63DC6270EE2F897430000000000000000000000000000000000", "hex");
 
-    // Send transaction
+    let buffer = Buffer.from("058000002c8000003c800000010000000000000000f8924685028fa6ae008306599594cc9a0b7c43dc2a5f023bb9b738e45b0ef6b06e0488016345785d8a0000b864474cf53d0000000000000000000000007d2768de32b0b80b7a3454c06bdac94a69ddc7a900000000000000000000000070bc641723fad48be2df6cf63dc6270ee2f8974300000000000000000000000000000000", "hex");
     let tx = transport.send(0xe0, 0x04, 0x00, 0x00, buffer);
+
+    buffer = Buffer.from("00000000000000000000000000000000018080", "hex");
+    tx = transport.send(0xe0, 0x04, 0x80, 0x00, buffer);
+
     let filename;
 
     await sim.waitUntilScreenIsNot(sim.getMainMenuSnapshot());
@@ -125,9 +130,9 @@ test("Deposit ETH nanox", async () => {
 
     // Data present
     filename = "data_present.png";
-    await sim.clickRight(SNAPSHOT_PATH_NANOS + filename);
-    const data_present = Zemu.LoadPng2RGB(SNAPSHOT_PATH_NANOS + filename);
-    const expected_data_present = Zemu.LoadPng2RGB(ORIGINAL_SNAPSHOT_PATH_NANOS + filename);
+    await sim.clickRight(SNAPSHOT_PATH_NANOX + filename);
+    const data_present = Zemu.LoadPng2RGB(SNAPSHOT_PATH_NANOX + filename);
+    const expected_data_present = Zemu.LoadPng2RGB(ORIGINAL_SNAPSHOT_PATH_NANOX + filename);
     expect(data_present).toEqual(expected_data_present);
 
     // Amount
@@ -161,7 +166,7 @@ test("Deposit ETH nanox", async () => {
     await sim.clickBoth();
 
     await expect(tx).resolves.toEqual(
-      Buffer.from([ 38, 111, 56, 157, 21, 50, 15, 5, 1, 56, 53, 38, 237, 3, 222, 145, 124, 20, 33, 39, 22, 240, 154, 38, 45, 188, 152, 67, 16, 134, 165, 219, 73, 13, 201, 148, 183, 185, 114, 48, 187, 53, 253, 246, 254, 194, 244, 216, 255, 76, 251, 139, 254, 178, 166, 82, 195, 100, 199, 56, 255, 3, 60, 5, 221, 144, 0])
+      Buffer.from([38, 181, 174, 58, 1, 30, 181, 14, 125, 31, 233, 245, 230, 246, 217, 28, 169, 244, 223, 202, 95, 115, 128, 95, 196, 134, 109, 73, 231, 46, 173, 47, 92, 60, 110, 85, 219, 89, 37, 88, 107, 181, 142, 67, 75, 88, 178, 192, 71, 86, 246, 98, 19, 21, 151, 249, 140, 26, 162, 65, 139, 22, 153, 43, 129, 144, 0])
     );
   } finally {
     await sim.close();
diff --git a/tests/src/generic.js b/tests/src/generic.js
index 0fb103d..59968b4 100644
--- a/tests/src/generic.js
+++ b/tests/src/generic.js
@@ -18,9 +18,12 @@ const Resolve = require("path").resolve;
 const NANOS_ELF_PATH = Resolve("elfs/ethereum_nanos.elf");
 const NANOX_ELF_PATH = Resolve("elfs/ethereum_nanox.elf");
 
+const TIMEOUT = 1000000;
+
 module.exports = {
     NANOS_ELF_PATH,
     NANOX_ELF_PATH,
     sim_options_nanos,
-    sim_options_nanox
+    sim_options_nanox,
+    TIMEOUT,
 }
\ No newline at end of file
diff --git a/tests/src/send.test.js b/tests/src/send.test.js
index 80bca1e..37cbdee 100644
--- a/tests/src/send.test.js
+++ b/tests/src/send.test.js
@@ -6,7 +6,7 @@ import Zemu from "@zondax/zemu";
 import { TransportStatusError } from "@ledgerhq/errors";
 import { expect } from "../jest";
 
-const {NANOS_ELF_PATH, NANOX_ELF_PATH, sim_options_nanos, sim_options_nanox} = require("generic.js");
+const {NANOS_ELF_PATH, NANOX_ELF_PATH, sim_options_nanos, sim_options_nanox, TIMEOUT} = require("generic.js");
 
 const ORIGINAL_SNAPSHOT_PATH_PREFIX = "snapshots/send/";
 const SNAPSHOT_PATH_PREFIX = "snapshots/tmp/";
@@ -17,9 +17,8 @@ const ORIGINAL_SNAPSHOT_PATH_NANOX = ORIGINAL_SNAPSHOT_PATH_PREFIX + "nanox/";
 const SNAPSHOT_PATH_NANOS = SNAPSHOT_PATH_PREFIX + "nanos/";
 const SNAPSHOT_PATH_NANOX = SNAPSHOT_PATH_PREFIX + "nanox/";
 
-
 test("Transfer nanos", async () => {
-  jest.setTimeout(100000);
+  jest.setTimeout(TIMEOUT);
   const sim = new Zemu(NANOS_ELF_PATH);
 
   try {
@@ -108,7 +107,7 @@ test("Transfer nanos", async () => {
 });
 
 test("Transfer nanox", async () => {
-  jest.setTimeout(100000);
+  jest.setTimeout(TIMEOUT);
   const sim = new Zemu(NANOX_ELF_PATH);
 
   try {
diff --git a/tests/src/send_bsc.test.js b/tests/src/send_bsc.test.js
index e0a8700..dda50a3 100644
--- a/tests/src/send_bsc.test.js
+++ b/tests/src/send_bsc.test.js
@@ -6,7 +6,7 @@ import Zemu from "@zondax/zemu";
 import { TransportStatusError } from "@ledgerhq/errors";
 import { expect } from "../jest";
 
-const {NANOS_ELF_PATH, NANOX_ELF_PATH, sim_options_nanos, sim_options_nanox} = require("generic.js");
+const {NANOS_ELF_PATH, NANOX_ELF_PATH, sim_options_nanos, sim_options_nanox, TIMEOUT} = require("generic.js");
 
 const ORIGINAL_SNAPSHOT_PATH_PREFIX = "snapshots/send_bsc/";
 const SNAPSHOT_PATH_PREFIX = "snapshots/tmp/";
@@ -19,7 +19,7 @@ const SNAPSHOT_PATH_NANOX = SNAPSHOT_PATH_PREFIX + "nanox/";
 
 
 test("Transfer bsc nanos", async () => {
-  jest.setTimeout(100000);
+  jest.setTimeout(TIMEOUT);
   const sim = new Zemu(NANOS_ELF_PATH);
 
   try {
@@ -116,7 +116,7 @@ test("Transfer bsc nanos", async () => {
 });
 
 test("Transfer bsc nanox", async () => {
-  jest.setTimeout(100000);
+  jest.setTimeout(TIMEOUT);
   const sim = new Zemu(NANOX_ELF_PATH);
 
   try {