Replace println! calls with snapshot tests

.devcontainer/devcontainer.json

@@ -6,5 +6,6 @@
             "extensions": ["rust-lang.rust-analyzer"]
         }
     },
+    "postCreateCommand": "cargo install cargo-insta",
     "remoteUser": "vscode"
 }

.gitattributes

@@ -0,0 +1 @@
+*.snap linguist-language=Text

.github/workflows/test.yml

@@ -1,6 +1,8 @@
 name: Run tests
 on: pull_request
-env: { CLICOLOR_FORCE: 1 }
+env:
+  CLICOLOR_FORCE: 1
+  COLORTERM: "truecolor"
 
 jobs:
   cargo-fmt:

Cargo.toml

@@ -27,4 +27,5 @@ features = [
 
 [dev_dependencies]
 ansi_term = "0.12"
+insta = "1"
 rspec = "=1.0.0-beta.3"

src/customcolors.rs

@@ -26,10 +26,11 @@ impl From<(u8, u8, u8)> for CustomColor {
 #[cfg(test)]
 mod tests {
     use crate::*;
+    #[cfg_attr(feature = "no-color", ignore)]
     #[test]
     fn main() {
         let my_color = CustomColor::new(0, 120, 120);
-        println!("{}", "Greetings from Ukraine".custom_color(my_color));
+        insta::assert_display_snapshot!("Greetings from Ukraine".custom_color(my_color));
     }
 
     #[test]

src/lib.rs

@@ -736,6 +736,7 @@ impl From<ColoredString> for Box<dyn Error> {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use std::{error::Error, fmt::Write};
 
     #[test]
     fn formatting() {
@@ -749,47 +750,51 @@ mod tests {
     }
 
     #[test]
-    fn it_works() {
+    fn it_works() -> Result<(), Box<dyn Error>> {
+        let mut buf = String::new();
         let toto = "toto";
-        println!("{}", toto.red());
-        println!("{}", String::from(toto).red());
-        println!("{}", toto.blue());
-
-        println!("blue style ****");
-        println!("{}", toto.bold());
-        println!("{}", "yeah ! Red bold !".red().bold());
-        println!("{}", "yeah ! Yellow bold !".bold().yellow());
-        println!("{}", toto.bold().blue());
-        println!("{}", toto.blue().bold());
-        println!("{}", toto.blue().bold().underline());
-        println!("{}", toto.blue().italic());
-        println!("******");
-        println!("test clearing");
-        println!("{}", "red cleared".red().clear());
-        println!("{}", "bold cyan cleared".bold().cyan().clear());
-        println!("******");
-        println!("Bg tests");
-        println!("{}", toto.green().on_blue());
-        println!("{}", toto.on_magenta().yellow());
-        println!("{}", toto.purple().on_yellow());
-        println!("{}", toto.magenta().on_white());
-        println!("{}", toto.cyan().on_green());
-        println!("{}", toto.black().on_white());
-        println!("******");
-        println!("{}", toto.green());
-        println!("{}", toto.yellow());
-        println!("{}", toto.purple());
-        println!("{}", toto.magenta());
-        println!("{}", toto.cyan());
-        println!("{}", toto.white());
-        println!("{}", toto.white().red().blue().green());
-        println!("{}", toto.truecolor(255, 0, 0));
-        println!("{}", toto.truecolor(255, 255, 0));
-        println!("{}", toto.on_truecolor(0, 80, 80));
-        println!("{}", toto.custom_color((255, 255, 0)));
-        println!("{}", toto.on_custom_color((0, 80, 80)));
-        // uncomment to see term output
-        // assert!(false)
+        writeln!(&mut buf, "{}", toto.red())?;
+        writeln!(&mut buf, "{}", String::from(toto).red())?;
+        writeln!(&mut buf, "{}", toto.blue())?;
+
+        writeln!(&mut buf, "blue style ****")?;
+        writeln!(&mut buf, "{}", toto.bold())?;
+        writeln!(&mut buf, "{}", "yeah ! Red bold !".red().bold())?;
+        writeln!(&mut buf, "{}", "yeah ! Yellow bold !".bold().yellow())?;
+        writeln!(&mut buf, "{}", toto.bold().blue())?;
+        writeln!(&mut buf, "{}", toto.blue().bold())?;
+        writeln!(&mut buf, "{}", toto.blue().bold().underline())?;
+        writeln!(&mut buf, "{}", toto.blue().italic())?;
+        writeln!(&mut buf, "******")?;
+        writeln!(&mut buf, "test clearing")?;
+        writeln!(&mut buf, "{}", "red cleared".red().clear())?;
+        writeln!(&mut buf, "{}", "bold cyan cleared".bold().cyan().clear())?;
+        writeln!(&mut buf, "******")?;
+        writeln!(&mut buf, "Bg tests")?;
+        writeln!(&mut buf, "{}", toto.green().on_blue())?;
+        writeln!(&mut buf, "{}", toto.on_magenta().yellow())?;
+        writeln!(&mut buf, "{}", toto.purple().on_yellow())?;
+        writeln!(&mut buf, "{}", toto.magenta().on_white())?;
+        writeln!(&mut buf, "{}", toto.cyan().on_green())?;
+        writeln!(&mut buf, "{}", toto.black().on_white())?;
+        writeln!(&mut buf, "******")?;
+        writeln!(&mut buf, "{}", toto.green())?;
+        writeln!(&mut buf, "{}", toto.yellow())?;
+        writeln!(&mut buf, "{}", toto.purple())?;
+        writeln!(&mut buf, "{}", toto.magenta())?;
+        writeln!(&mut buf, "{}", toto.cyan())?;
+        writeln!(&mut buf, "{}", toto.white())?;
+        writeln!(&mut buf, "{}", toto.white().red().blue().green())?;
+        writeln!(&mut buf, "{}", toto.truecolor(255, 0, 0))?;
+        writeln!(&mut buf, "{}", toto.truecolor(255, 255, 0))?;
+        writeln!(&mut buf, "{}", toto.on_truecolor(0, 80, 80))?;
+        writeln!(&mut buf, "{}", toto.custom_color((255, 255, 0)))?;
+        writeln!(&mut buf, "{}", toto.on_custom_color((0, 80, 80)))?;
+        #[cfg(feature = "no-color")]
+        insta::assert_snapshot!("it_works_no_color", buf);
+        #[cfg(not(feature = "no-color"))]
+        insta::assert_snapshot!("it_works", buf);
+        Ok(())
     }
 
     #[test]

src/snapshots/colored__customcolors__tests__main.snap

@@ -0,0 +1,5 @@
+---
+source: src/customcolors.rs
+expression: "\"Greetings from Ukraine\".custom_color(my_color)"
+---
+Greetings from Ukraine

src/snapshots/colored__tests__it_works.snap

@@ -0,0 +1,41 @@
+---
+source: src/lib.rs
+expression: buf
+---
+toto
+toto
+toto
+blue style ****
+toto
+yeah ! Red bold !
+yeah ! Yellow bold !
+toto
+toto
+toto
+toto
+******
+test clearing
+red cleared
+bold cyan cleared
+******
+Bg tests
+toto
+toto
+toto
+toto
+toto
+toto
+******
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+

src/snapshots/colored__tests__it_works_no_color.snap

@@ -0,0 +1,41 @@
+---
+source: src/lib.rs
+expression: buf
+---
+toto
+toto
+toto
+blue style ****
+toto
+yeah ! Red bold !
+yeah ! Yellow bold !
+toto
+toto
+toto
+toto
+******
+test clearing
+red cleared
+bold cyan cleared
+******
+Bg tests
+toto
+toto
+toto
+toto
+toto
+toto
+******
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+toto
+