metrics: allow disabling OpenMetrics negotiation (#3944)

* metrics: allow disabling OpenMetrics negotiation

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

* fixup! metrics: allow disabling OpenMetrics negotiation

1 files changed, 45 insertions, 0 deletions

diff --git a/modules/metrics/metrics_test.go b/modules/metrics/metrics_test.go
new file mode 100644
index 0000000..d5bdf50
--- /dev/null
+++ b/modules/metrics/metrics_test.go
@@ -0,0 +1,45 @@
+package metrics
+
+import (
+	"testing"
+
+	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
+)
+
+func TestMetricsUnmarshalCaddyfile(t *testing.T) {
+	m := &Metrics{}
+	d := caddyfile.NewTestDispenser(`metrics bogus`)
+	err := m.UnmarshalCaddyfile(d)
+	if err == nil {
+		t.Errorf("expected error")
+	}
+
+	m = &Metrics{}
+	d = caddyfile.NewTestDispenser(`metrics`)
+	err = m.UnmarshalCaddyfile(d)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	if m.DisableOpenMetrics != false {
+		t.Errorf("DisableOpenMetrics should've been false: %v", m.DisableOpenMetrics)
+	}
+
+	m = &Metrics{}
+	d = caddyfile.NewTestDispenser(`metrics { disable_openmetrics }`)
+	err = m.UnmarshalCaddyfile(d)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	if m.DisableOpenMetrics != true {
+		t.Errorf("DisableOpenMetrics should've been true: %v", m.DisableOpenMetrics)
+	}
+
+	m = &Metrics{}
+	d = caddyfile.NewTestDispenser(`metrics { bogus }`)
+	err = m.UnmarshalCaddyfile(d)
+	if err == nil {
+		t.Errorf("expected error: %v", err)
+	}
+}