ahora si funciona

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

functions/infra/collect_host_metrics_test.go

@@ -0,0 +1,43 @@
+package infra
+
+import "testing"
+
+func TestCollectHostMetrics_ReturnsBasics(t *testing.T) {
+	samples, err := CollectHostMetrics()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(samples) == 0 {
+		t.Fatal("expected at least one sample")
+	}
+
+	// node_uptime_seconds es el unico colector imprescindible: debe estar siempre.
+	found := false
+	for _, s := range samples {
+		if s.Name == "node_uptime_seconds" {
+			found = true
+			if s.Value <= 0 {
+				t.Errorf("node_uptime_seconds should be positive, got %v", s.Value)
+			}
+		}
+	}
+	if !found {
+		t.Error("node_uptime_seconds not present in samples")
+	}
+}
+
+func TestCollectHostMetrics_SamplesWellFormed(t *testing.T) {
+	samples, err := CollectHostMetrics()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	for i, s := range samples {
+		if s.Name == "" {
+			t.Errorf("sample %d has empty Name", i)
+		}
+		// La label "instance" NO debe estar: la añade el pusher.
+		if _, ok := s.Labels["instance"]; ok {
+			t.Errorf("sample %d (%s) must not carry the instance label", i, s.Name)
+		}
+	}
+}