chore: import upstream snapshot with attribution

internal/sysproxy/sysproxy_test.go

@@ -0,0 +1,49 @@
+package sysproxy
+
+import "testing"
+
+func TestParseProxyList(t *testing.T) {
+	for _, tc := range []struct {
+		name, list, scheme, want string
+	}{
+		{"single all-protocol", "proxy.example.com:8080", "https", "http://proxy.example.com:8080"},
+		{"per-protocol https", "http=p1:80;https=p2:443", "https", "http://p2:443"},
+		{"per-protocol http", "http=p1:80;https=p2:443", "http", "http://p1:80"},
+		{"scheme miss falls back to bare", "p0:3128;ftp=p1:21", "https", "http://p0:3128"},
+		{"strips scheme prefix", "http://p:8080", "https", "http://p:8080"},
+		{"empty", "", "https", ""},
+		{"only other protocol, no bare", "ftp=p:21", "https", ""},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			got := parseProxyList(tc.list, tc.scheme)
+			if tc.want == "" {
+				if got != nil {
+					t.Fatalf("got %v, want nil", got)
+				}
+				return
+			}
+			if got == nil || got.String() != tc.want {
+				t.Fatalf("got %v, want %s", got, tc.want)
+			}
+		})
+	}
+}
+
+func TestBypassed(t *testing.T) {
+	for _, tc := range []struct {
+		host, bypass string
+		want         bool
+	}{
+		{"api.deepseek.com", "<local>", false},
+		{"intranet", "<local>", true},
+		{"host.corp.local", "*.corp.local", true},
+		{"api.deepseek.com", "*.corp.local;<local>", false},
+		{"api.deepseek.com", "api.deepseek.com", true},
+		{"API.DeepSeek.com", "api.deepseek.com", true},
+		{"api.deepseek.com", "", false},
+	} {
+		if got := bypassed(tc.host, tc.bypass); got != tc.want {
+			t.Errorf("bypassed(%q, %q) = %v, want %v", tc.host, tc.bypass, got, tc.want)
+		}
+	}
+}