Improve error formatting in assert methods for better readability

Author: tomas-novotny

CHANGELOG.md

@@ -6,7 +6,12 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 
-## [Unreleased](https://github.com/gravitton/assert/compare/v1.2.0...master)
+## [Unreleased](https://github.com/gravitton/assert/compare/v1.2.1...master)
+
+
+## v1.2.1 (2026-04-27)(https://github.com/gravitton/assert/compare/v1.2.0...v1.2.1)
+### Changed
+- Improve error formatting in `Error` assert methods for better readability
 
 
 ## v1.2.0 (2026-04-22)(https://github.com/gravitton/assert/compare/v1.1.0...v1.2.0)

assert.go

@@ -265,7 +265,7 @@ func NoError(t Testing, err error, messages ...string) bool {
 	t.Helper()
 
 	if !isNilError(err) {
-		return Failf(t, "%sShould not be error\n   error: %#v", message(messages), err)
+		return Failf(t, "%sShould not be error\n     msg: %[2]v\n   error: %#[2]v", message(messages), err)
 	}
 
 	return true
@@ -276,7 +276,7 @@ func ErrorIs(t Testing, err error, target error, messages ...string) bool {
 	t.Helper()
 
 	if !errors.Is(err, target) {
-		return Failf(t, "%sShould be same error\n   error: %#v\n  target: %#v", message(messages), err, target)
+		return Failf(t, "%sShould be same error\n     msg: %[2]v\n   error: %#[2]v\n  target: %#v", message(messages), err, target)
 	}
 
 	return true
@@ -287,7 +287,7 @@ func NotErrorIs(t Testing, err error, target error, messages ...string) bool {
 	t.Helper()
 
 	if errors.Is(err, target) {
-		return Failf(t, "%sShould not be same error\n   error: %#v\n  target: %#v", message(messages), err, target)
+		return Failf(t, "%sShould not be same error\n     msg: %[2]v\n   error: %#[2]v\n  target: %#v", message(messages), err, target)
 	}
 
 	return true