Add tests for pkg/errors Wrap, Wrapf, WithMessage

Author: tomarrell

wrapcheck/testdata/ignore_pkg_errors/main.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/pkg/errors"
+)
+
+func main() {
+	do()
+}
+
+func do() error {
+	err := fmt.Errorf("failed to do something")
+	if err != nil {
+		return errors.Wrap(err, "uh oh")
+	}
+
+	if err != nil {
+		return errors.Wrapf(err, "uh oh")
+	}
+
+	if err != nil {
+		return errors.WithMessage(err, "uh oh")
+	}
+
+	return nil
+}

wrapcheck/testdata/ignore_pkg_errors/src/github.com/pkg/errors

@@ -0,0 +1 @@
+Subproject commit 5dd12d0cfe7f152f80558d591504ce685299311e