v1.0.3

CHANGELOG.md

@@ -5,9 +5,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [1.0.2] - 2022-02-18
+## [1.0.3] - 2022-02-18
 ### Added
+- Tests covering `.Is`.`
+
+### Changed
+- `.Is` is on a pointer instead of value.
 
+## [1.0.2] - 2022-02-18
+### Added
 - API info is only added to error message on `APIError`.
 
 ## [1.0.1] - 2022-02-18

customerror.go

@@ -76,7 +76,7 @@ func (cE *CustomError) Unwrap() error {
 // Is interface implementation ensures chain continuity. Treats `CustomError` as
 // equivalent to `err`.
 //nolint:errorlint
-func (cE CustomError) Is(err error) bool {
+func (cE *CustomError) Is(err error) bool {
 	return cE.Err == err
 }
 

example_test.go

@@ -68,3 +68,15 @@ func ExampleNew_options() {
 	// output:
 	// E1010: missing id (406 - Not Acceptable). Original Error: some error
 }
+
+// Demonstrates error chain. `errB` will wrap `errA` and will be considered the
+// same by propagating the chain.
+func ExampleNew_is() {
+	errA := NewMissingError("id")
+	errB := NewMissingError("name", WithError(errA))
+
+	fmt.Println(errors.Is(errB, errA))
+
+	// output:
+	// true
+}