use plain pkg module

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

pkg/structs/structs_test.go

@@ -0,0 +1,38 @@
+package structs
+
+import "testing"
+
+type example struct {
+	Attribute1 string
+	Attribute2 string
+}
+
+func TestCopyOrZeroValue(t *testing.T) {
+	var e *example
+
+	zv := CopyOrZeroValue(e)
+
+	if zv == nil {
+		t.Error("CopyOrZeroValue returned nil")
+	}
+
+	if zv.Attribute1 != "" || zv.Attribute2 != "" {
+		t.Error("CopyOrZeroValue didn't return zero value")
+	}
+
+	e2 := &example{Attribute1: "One", Attribute2: "Two"}
+
+	cp := CopyOrZeroValue(e2)
+
+	if cp == nil {
+		t.Error("CopyOrZeroValue returned nil")
+	}
+
+	if cp == e2 {
+		t.Error("CopyOrZeroValue returned reference with same address")
+	}
+
+	if cp.Attribute1 != e2.Attribute1 || cp.Attribute2 != e2.Attribute2 {
+		t.Error("CopyOrZeroValue didn't correctly copy attributes")
+	}
+}