feat(check): track test additions separately from failures

Tweak the output so those cases are more easily distinguishable,
especially the color used by the `+` symbol next to the test name.
Exit code is now 2 if all existing tests succeeded, but some were added.

Author: ThinkChaos

src/cmd/check.rs

@@ -34,6 +34,7 @@ pub fn check(root: &Path, opts: Opts, cfg: Option<Config>) -> Result<()> {
 
         let total = output.results.len();
         let mut failures = 0;
+        let mut additions = 0;
         for (name, res) in output.results {
             let new = pending.join(&name);
             match res {
@@ -42,24 +43,35 @@ pub fn check(root: &Path, opts: Opts, cfg: Option<Config>) -> Result<()> {
                 }
 
                 TestResult::Failure { snapshot, old } => {
-                    failures += 1;
-                    println!("{} {name}", if old { "✘" } else { "🞥" }.red());
+                    if old {
+                        failures += 1;
+                        println!("{} {name}", "✘".red());
+                    } else {
+                        additions += 1;
+                        println!("{} {name}", "🞥".blue());
+                    }
                     snapshot.to_writer(File::create(new)?)?;
                 }
             }
         }
 
-        if failures == 0 {
+        if failures == 0 && additions == 0 {
             if success {
                 eprintln!("All {total} tests succeeded");
                 return Ok(());
             } else {
                 break;
             }
         } else {
-            eprintln!("{failures} out of {total} tests failed");
+            if failures != 0 {
+                let existing = total - additions;
+                eprintln!("{failures} out of {existing} tests failed");
+            }
+            if additions != 0 {
+                eprintln!("{additions} new tests found");
+            }
             eprintln!("run `namaka review` to review the pending snapshots");
-            exit(1);
+            exit(if failures != 0 { 1 } else { 2 });
         }
     }