diff --git a/Cargo.lock b/Cargo.lock
index aa35521..1b637c2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,129 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "console"
+version = "0.15.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "054ccb5b10f9f2cbf51eb355ca1d05c2d279ce1804688d0db74b4733a5aeafd8"
+dependencies = [
+ "encode_unicode",
+ "libc",
+ "once_cell",
+ "windows-sys",
+]
+
+[[package]]
+name = "encode_unicode"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34aa73646ffb006b8f5147f3dc182bd4bcb190227ce861fc4a4844bf8e3cb2c0"
+
+[[package]]
+name = "insta"
+version = "1.43.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "154934ea70c58054b556dd430b99a98c2a7ff5309ac9891597e339b5c28f4371"
+dependencies = [
+ "console",
+ "once_cell",
+ "similar",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.172"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d750af042f7ef4f724306de029d18836c26c1765a54a6a3f094cbd23a7267ffa"
+
+[[package]]
+name = "once_cell"
+version = "1.21.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
+
 [[package]]
 name = "osdb"
 version = "0.1.0"
+dependencies = [
+ "insta",
+]
+
+[[package]]
+name = "similar"
+version = "2.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbbb5d9659141646ae647b42fe094daf6c6192d1620870b449d9557f748b2daa"
+
+[[package]]
+name = "windows-sys"
+version = "0.59.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
diff --git a/Cargo.toml b/Cargo.toml
index f1dfdcc..c53c9f7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,3 +5,6 @@ edition = "2024"
 authors = ["Khaïs COLIN"]
 
 [dependencies]
+
+[dev-dependencies]
+insta = "1.43.1"
diff --git a/flake.nix b/flake.nix
index 9553b75..e3d9831 100644
--- a/flake.nix
+++ b/flake.nix
@@ -27,6 +27,7 @@
           pkgs.clippy
           pkgs.bacon
           pkgs.cargo-semver-checks
+          pkgs.cargo-insta
         ];
       };
       packages.default = pkgs.rustPlatform.buildRustPackage {
diff --git a/notes.org b/notes.org
index a1fba55..c673d2f 100644
--- a/notes.org
+++ b/notes.org
@@ -1,14 +1,64 @@
 #+title: Notes
 
-* show errors with ariadne
+* TODO show errors with ariadne
 :PROPERTIES:
 :EFFORT:   10min
 :END:
-** errors should have a generic show() function
+** [X] errors should have a generic show() function
 :PROPERTIES:
 :EFFORT:   10min
 :END:
 :LOGBOOK:
 CLOCK: [2025-05-03 sam. 18:40]--[2025-05-03 sam. 18:46] =>  0:06
 :END:
-** OSDBError::display() should take a filename and display it alongside the error
+** TODO OSDBError::display() should take a filename and display it alongside the error
+
+* TODO snapshot testing
+
+** DONE Find the snapshot testing library
+:PROPERTIES:
+:EFFORT:   10min
+:END:
+:LOGBOOK:
+CLOCK: [2025-05-03 sam. 18:48]--[2025-05-03 sam. 18:49] =>  0:01
+:END:
+
+** DONE document myself on insta, the snapshot testing library
+:PROPERTIES:
+:EFFORT:   10min
+:END:
+:LOGBOOK:
+CLOCK: [2025-05-03 sam. 18:49]--[2025-05-03 sam. 18:57] =>  0:08
+:END:
+
+** TODO insta test startup message
+:PROPERTIES:
+:EFFORT:   10min
+:END:
+:LOGBOOK:
+CLOCK: [2025-05-03 sam. 19:00]
+:END:
+** TODO insta test exit message
+:PROPERTIES:
+:EFFORT:   10min
+:END:
+** TODO insta test insert
+:PROPERTIES:
+:EFFORT:   10min
+:END:
+** TODO insta test select
+:PROPERTIES:
+:EFFORT:   10min
+:END:
+** TODO insta test .exit
+:PROPERTIES:
+:EFFORT:   10min
+:END:
+** TODO insta test wrong statement
+:PROPERTIES:
+:EFFORT:   10min
+:END:
+** TODO insta test wrong meta-command
+:PROPERTIES:
+:EFFORT:   10min
+:END:
diff --git a/src/branding.rs b/src/branding.rs
index e5583c2..c580531 100644
--- a/src/branding.rs
+++ b/src/branding.rs
@@ -1,8 +1,18 @@
-pub fn startup_msg() {
+#[cfg(test)]
+use insta::assert_snapshot;
+
+pub fn startup_msg() -> String {
     let name = env!("CARGO_PKG_NAME");
     let version = env!("CARGO_PKG_VERSION");
     let authors = env!("CARGO_PKG_AUTHORS");
 
-    println!("{name} v{version} started.",);
-    println!("Copyright 2025 {authors}. All rights reserved.")
+    format!(
+        "{name} v{version} started.\n\
+        Copyright 2025 {authors}. All rights reserved."
+    )
+}
+
+#[test]
+fn test_startup_msg() {
+    assert_snapshot!(startup_msg())
 }
diff --git a/src/main.rs b/src/main.rs
index 7f05008..2ab552f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,7 +4,7 @@ use osdb::command::Command;
 use osdb::error_display::OSDBError as _;
 
 fn main() {
-    startup_msg();
+    println!("{}", startup_msg());
     while let Some(input) = read_input() {
         match input.parse::<Command>() {
             Ok(cmd) => {
diff --git a/src/snapshots/osdb__branding__startup_msg.snap b/src/snapshots/osdb__branding__startup_msg.snap
new file mode 100644
index 0000000..97e76fa
--- /dev/null
+++ b/src/snapshots/osdb__branding__startup_msg.snap
@@ -0,0 +1,6 @@
+---
+source: src/branding.rs
+expression: startup_msg()
+---
+osdb v0.1.0 started.
+Copyright 2025 Khaïs COLIN. All rights reserved.