diff --git a/pkg/runtime/core/errors_test.go b/pkg/runtime/core/errors_test.go
new file mode 100644
index 00000000..328fe9f4
--- /dev/null
+++ b/pkg/runtime/core/errors_test.go
@@ -0,0 +1,35 @@
+package core_test
+
+import (
+	"testing"
+
+	"github.com/MontFerret/ferret/pkg/runtime/core"
+	"github.com/pkg/errors"
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestSourceError(t *testing.T) {
+	Convey("Should match", t, func() {
+		sm := core.NewSourceMap("test", 1, 1)
+
+		msg := "test at 1:1"
+		cause := errors.New("cause")
+		e := errors.Errorf("%s: %s", cause.Error(), msg)
+
+		cse := core.SourceError(sm, cause)
+		So(cse, ShouldNotBeNil)
+		So(cse.Error(), ShouldEqual, e.Error())
+	})
+}
+
+func TestError(t *testing.T) {
+	Convey("Should match", t, func() {
+		msg := "test message"
+		cause := errors.New("cause")
+		e := errors.Errorf("%s: %s", cause.Error(), msg)
+
+		ce := core.Error(cause, msg)
+		So(ce, ShouldNotBeNil)
+		So(ce.Error(), ShouldEqual, e.Error())
+	})
+}