// Test that cmd/go doesn't link in the HTTP server.                                                                                                                                                   
//                                                                                                                                                                                                     
// This catches accidental dependencies between the HTTP transport and                                                                                                                                 
// server code.                                                                                                                                                                                        
func TestCmdGoNoHTTPServer(t *testing.T) {
        t.Parallel()
        goBin := testenv.GoToolPath(t)
        out, err := exec.Command(goBin, "tool", "nm", goBin).CombinedOutput()
        if err != nil {
                t.Fatalf("go tool nm: %v: %s", err, out)
        }
        wantSym := map[string]bool{
                // Verify these exist: (sanity checking this test)                                                                                                                                     
                "net/http.(*Client).Get":          true,
                "net/http.(*Transport).RoundTrip": true,

                // Verify these don't exist:                                                                                                                                                           
                "net/http.http2Server":           false,
                "net/http.(*Server).Serve":       false,
                "net/http.(*ServeMux).ServeHTTP": false,
                "net/http.DefaultServeMux":       false,
        }
        for sym, want := range wantSym {
                got := bytes.Contains(out, []byte(sym))
                if !want && got {
                        t.Errorf("cmd/go unexpectedly links in HTTP server code; found symbol %q in cmd/go", sym)
                }
                if want && !got {
                        t.Errorf("expected to find symbol %q in cmd/go; not found", sym)
                }
        }
}