Added an Is function to Compare Custom Errors

cerrors/cerror.go

@@ -0,0 +1,20 @@
+package cerrors
+
+import (
+	"errors"
+	"github.com/rozturac/cerror"
+)
+
+func Is(source, target error) bool {
+	cSource, cSourceOk := source.(cerror.Error)
+	cTarget, cTargetOk := target.(cerror.Error)
+	if cSourceOk && cTargetOk {
+		return cSource.ErrorType() == cTarget.ErrorType() &&
+			cSource.ErrorCode() == cTarget.ErrorCode() &&
+			cSource.Error() == cTarget.Error()
+	} else if !cSourceOk && !cTargetOk {
+		return errors.Is(source, target)
+	} else {
+		return false
+	}
+}

cerrors/cerror_test.go

@@ -0,0 +1,98 @@
+package cerrors
+
+import (
+	"errors"
+	"github.com/rozturac/cerror"
+	"testing"
+)
+
+func TestIs_WhenSourceIsCustomErrorOnly(t *testing.T) {
+	sourceError := cerror.NullReferenceError("test")
+	targetError := errors.New("test")
+	want := false
+
+	got := Is(sourceError, targetError)
+
+	if want != got {
+		t.Errorf("Is(sourceError, targetError)=%v, expected: %v", got, want)
+	}
+}
+
+func TestIs_WhenTargetIsCustomErrorOnly(t *testing.T) {
+	sourceError := errors.New("test")
+	targetError := cerror.NullReferenceError("test")
+	want := false
+
+	got := Is(sourceError, targetError)
+
+	if want != got {
+		t.Errorf("Is(sourceError, targetError)=%v, expected: %v", got, want)
+	}
+}
+
+func TestIs_WhenTargetAndSourceIsCustomError(t *testing.T) {
+	sourceError := cerror.NullReferenceError("test")
+	targetError := cerror.NullReferenceError("test")
+	want := true
+
+	got := Is(sourceError, targetError)
+
+	if want != got {
+		t.Errorf("Is(sourceError, targetError)=%v, expected: %v", got, want)
+	}
+}
+
+func TestIs_WhenTargetAndSourceIsNotCustomError(t *testing.T) {
+	err := errors.New("test error")
+	sourceError := err
+	targetError := err
+	want := true
+
+	got := Is(sourceError, targetError)
+
+	if want != got {
+		t.Errorf("Is(sourceError, targetError)=%v, expected: %v", got, want)
+	}
+}
+
+func TestIs_WhenTargetAndSourceIsNil(t *testing.T) {
+	var (
+		sourceError error = nil
+		targetError error = nil
+		want        bool  = true
+	)
+
+	got := Is(sourceError, targetError)
+
+	if want != got {
+		t.Errorf("Is(sourceError, targetError)=%v, expected: %v", got, want)
+	}
+}
+
+func TestIs_WhenSourceIsNilOnly(t *testing.T) {
+	var (
+		sourceError error = nil
+		targetError error = errors.New("test")
+		want        bool  = false
+	)
+
+	got := Is(sourceError, targetError)
+
+	if want != got {
+		t.Errorf("Is(sourceError, targetError)=%v, expected: %v", got, want)
+	}
+}
+
+func TestIs_WhenTargetIsNilOnly(t *testing.T) {
+	var (
+		sourceError error = errors.New("test")
+		targetError error = nil
+		want        bool  = false
+	)
+
+	got := Is(sourceError, targetError)
+
+	if want != got {
+		t.Errorf("Is(sourceError, targetError)=%v, expected: %v", got, want)
+	}
+}

go.sum

@@ -0,0 +1,50 @@
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