Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

numeric/bin_test.go

@@ -0,0 +1,27 @@
+package numeric
+
+import "testing"
+
+func TestInterleaveDeinterleave(t *testing.T) {
+	tests := []struct {
+		v1 uint64
+		v2 uint64
+	}{
+		{0, 0},
+		{1, 1},
+		{27, 39},
+		{1<<32 - 1, 1<<32 - 1}, // largest that should still work
+	}
+
+	for _, test := range tests {
+		i := Interleave(test.v1, test.v2)
+		gotv1 := Deinterleave(i)
+		gotv2 := Deinterleave(i >> 1)
+		if gotv1 != test.v1 {
+			t.Errorf("expected v1: %d, got %d, interleaved was %x", test.v1, gotv1, i)
+		}
+		if gotv2 != test.v2 {
+			t.Errorf("expected v2: %d, got %d, interleaved was %x", test.v2, gotv2, i)
+		}
+	}
+}