examples

Author: PeterIvanov

example_test.go

@@ -0,0 +1,75 @@
+package errorx_test
+
+import (
+	"fmt"
+	"github.com/joomcode/errorx"
+)
+
+func ExampleDecorate() {
+	err := someFunc()
+	fmt.Println(err.Error())
+
+	err = errorx.Decorate(err, "decorate")
+	fmt.Println(err.Error())
+
+	err = errorx.Decorate(err, "outer decorate")
+	fmt.Println(err.Error())
+
+	// Output: common.assertion_failed: example
+	// decorate, cause: common.assertion_failed: example
+	// outer decorate, cause: decorate, cause: common.assertion_failed: example
+}
+
+func ExampleDecorateMany() {
+	err0 := someFunc()
+	err1 := someFunc()
+	err := errorx.DecorateMany("both calls failed", err0, err1)
+	fmt.Println(err.Error())
+
+	// Output: both calls failed, cause: common.assertion_failed: example (hidden: common.assertion_failed: example)
+}
+
+func ExampleError_WithUnderlyingErrors() {
+	fn := func() error {
+		bytes, err := getBodyAndError()
+		if err != nil {
+			_, unmarshalErr := getDetailsFromBody(bytes)
+			if unmarshalErr != nil {
+				return errorx.AssertionFailed.Wrap(err, "failed to read details").WithUnderlyingErrors(unmarshalErr)
+			}
+		}
+
+		return nil
+	}
+
+	fmt.Println(fn().Error())
+	// Output: common.assertion_failed: failed to read details, cause: common.assertion_failed: example (hidden: common.illegal_format)
+}
+
+func ExampleType_Wrap() {
+	originalErr := errorx.IllegalArgument.NewWithNoMessage()
+	err := errorx.AssertionFailed.Wrap(originalErr, "wrapped")
+
+	fmt.Println(errorx.IsOfType(originalErr, errorx.IllegalArgument))
+	fmt.Println(errorx.IsOfType(err, errorx.IllegalArgument))
+	fmt.Println(errorx.IsOfType(err, errorx.AssertionFailed))
+	fmt.Println(err.Error())
+
+	// Output:
+	// true
+	// false
+	// true
+	// common.assertion_failed: wrapped, cause: common.illegal_argument
+}
+
+func someFunc() error {
+	return errorx.AssertionFailed.New("example")
+}
+
+func getBodyAndError() ([]byte, error) {
+	return nil, errorx.AssertionFailed.New("example")
+}
+
+func getDetailsFromBody(s []byte) (string, error) {
+	return "", errorx.IllegalFormat.New(string(s))
+}