fixes Pass ...Wrapper list to New constructor #31

fundamental.go

@@ -3,12 +3,18 @@ package fault
 import "fmt"
 
 // New creates a new basic fault error.
-func New(message string) error {
+func New(message string, w ...Wrapper) error {
 	f := &fundamental{
 		msg:      message,
 		location: getLocation(),
 	}
-	return f
+
+	var err error = f
+	for _, fn := range w {
+		err = fn(err)
+	}
+
+	return err
 }
 
 // Newf includes formatting specifiers.

fundamental_test.go

@@ -0,0 +1,39 @@
+package fault
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+type testNewExampleWraper struct{ e error }
+
+func (e *testNewExampleWraper) Error() string { return "example wrapper" }
+func (e *testNewExampleWraper) Unwrap() error { return e.e }
+
+func testNewExampleWrap() func(error) error {
+	return func(err error) error {
+		return &testNewExampleWraper{err}
+	}
+}
+
+func TestNew(t *testing.T) {
+	r := require.New(t)
+	var err error
+
+	err = New("TestNew example")
+	r.Error(err)
+
+	err = New("TestNew example", testNewExampleWrap())
+	r.Error(err)
+	_, casts := err.(*testNewExampleWraper)
+	r.True(casts)
+}
+
+func TestNewf(t *testing.T) {
+	r := require.New(t)
+
+	err := Newf("TestNew example %s", "one")
+	r.Error(err)
+	r.Equal("TestNew example one", err.Error())
+}