fix(all): stabilize login and proxy-aware game startup

go/internal/client/app/game_proxy_test.go

@@ -0,0 +1,44 @@
+package app
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func TestGameProxyEnvironmentPreservesExplicitAndIsIdempotent(t *testing.T) {
+	input := []string{"PATH=kept", "UNITY_PROXYSERVER=http://explicit:8080", "UNITY_NOPROXY=example.org;localhost"}
+	got := gameProxyEnvironment(input, "http://system:8888")
+	if !reflect.DeepEqual(got, gameProxyEnvironment(got, "http://other:9999")) {
+		t.Fatal("environment is not idempotent")
+	}
+	if got[1] != input[1] || input[2] != "UNITY_NOPROXY=example.org;localhost" {
+		t.Fatal("explicit environment changed or input mutated")
+	}
+	if !strings.Contains(got[2], "127.0.0.1") || !strings.Contains(got[2], "::1") {
+		t.Fatal("loopback bypass missing")
+	}
+}
+
+func TestSharedWindowsProxy(t *testing.T) {
+	for _, test := range []struct{ input, want string }{
+		{"127.0.0.1:12451", "http://127.0.0.1:12451"},
+		{"http=proxy:8080;https=proxy:8080", "http://proxy:8080"},
+		{"http=proxy:8080;https=other:8080", ""},
+		{"https=proxy:8080", ""}, {"user:password@proxy:8080", ""}, {"proxy:99999", ""},
+	} {
+		if got := sharedWindowsProxy(test.input); got != test.want {
+			t.Errorf("proxy configuration result mismatch")
+		}
+	}
+}
+
+func TestGameProxyEnvironmentIgnoresInvalidSystemProxy(t *testing.T) {
+	for _, proxy := range []string{"", "https://proxy:443", "http://user:password@proxy:8080", "http://proxy:8080/path"} {
+		for _, entry := range gameProxyEnvironment(nil, proxy) {
+			if strings.HasPrefix(entry, "UNITY_PROXYSERVER=") {
+				t.Fatal("invalid system proxy accepted")
+			}
+		}
+	}
+}