Add test for ptr()

1 files changed, 36 insertions, 0 deletions

diff --git a/gl_test.go b/gl_test.go
new file mode 100644
index 0000000..8aba62c
--- /dev/null
+++ b/gl_test.go
@@ -0,0 +1,36 @@
+// Copyright 2012 The go-gl Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gl
+
+import (
+	"testing"
+	"unsafe"
+)
+
+func TestPtr(t *testing.T) {
+	// test nil
+	if p, q := unsafe.Pointer(nil), ptr(nil); p != q {
+		t.Fatalf("expected %#v, got %#v\n", p, q)
+	}
+
+	// test nil interface
+	var r interface{}
+	if p, q := unsafe.Pointer(nil), ptr(r); p != q {
+		t.Fatalf("expected %#v, got %#v\n", p, q)
+	}
+
+	// test nil pointer
+	var s *int
+	if p, q := unsafe.Pointer(nil), ptr(s); p != q {
+		t.Fatalf("expected %#v, got %#v\n", p, q)
+	}
+
+	// test uinptr
+	for _, n := range []uintptr{0, 1, 2, 42} {
+		if p, q := unsafe.Pointer(n), ptr(n); p != q {
+			t.Fatalf("expected %#v, got %#v\n", p, q)
+		}
+	}
+}