goipgrep: refactor into module; pure-Go ping/resolve; cache+CI; drop binary

projects/go-tools/go/goipgrep/internal/normalize/mac_test.go

@@ -0,0 +1,23 @@
+package normalize
+
+import "testing"
+
+func TestNormalizeMAC(t *testing.T) {
+	cases := map[string]string{
+		"AA:BB:CC:DD:EE:FF": "aa:bb:cc:dd:ee:ff",
+		"aa-bb-cc-dd-ee-ff": "aa:bb:cc:dd:ee:ff",
+		"aabb.ccdd.eeff":    "aa:bb:cc:dd:ee:ff",
+	}
+	for in, want := range cases {
+		got, ok := NormalizeMAC(in)
+		if !ok {
+			t.Fatalf("NormalizeMAC(%q) not ok", in)
+		}
+		if got != want {
+			t.Fatalf("NormalizeMAC(%q)=%q want %q", in, got, want)
+		}
+	}
+	if _, ok := NormalizeMAC("not-a-mac"); ok {
+		t.Fatalf("expected invalid mac")
+	}
+}