diff --git a/README.md b/README.md
index da28edb..f05495d 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,35 @@ Prometheus exporter for the Icinga2 API.
 The `icinga2_exporter` listens on HTTP port 9665 by default.
 See the `-help` output for more options.
 
+```
+-collector.apilistener
+      Include APIListener data
+-debug
+      Enable debug logging
+-icinga.api string
+      Path to the Icinga2 API (default "https://localhost:5665/v1")
+-icinga.cafile string
+      Path to the Icinga2 API TLS CA
+-icinga.certfile string
+      Path to the Icinga2 API TLS cert
+-icinga.insecure
+      Skip TLS verification for Icinga2 API
+-icinga.keyfile string
+      Path to the Icinga2 API TLS key
+-icinga.password string
+      Icinga2 API Password
+-icinga.username string
+      Icinga2 API Username
+-version
+      Print version
+-web.cache-ttl uint
+      Cache lifetime in seconds for the Icinga API responses (default 60)
+-web.listen-address string
+      Address on which to expose metrics and web interface. (default ":9665")
+-web.metrics-path string
+      Path under which to expose metrics. (default "/metrics")
+```
+
 ## Collectors
 
 By default only the `CIB` metrics of the status API are collected.
diff --git a/internal/icinga/client_test.go b/internal/icinga/client_test.go
new file mode 100644
index 0000000..7f09ae8
--- /dev/null
+++ b/internal/icinga/client_test.go
@@ -0,0 +1,82 @@
+package icinga
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"reflect"
+	"testing"
+	"time"
+)
+
+const (
+	icingaTestDataCIB1 = "testdata/cib1.json"
+)
+
+func loadTestdata(filepath string) []byte {
+	data, _ := os.ReadFile(filepath)
+	return data
+}
+
+func testConfig(ts *httptest.Server) Config {
+	u, _ := url.Parse(ts.URL)
+	return Config{
+		BasicAuthUsername: "",
+		BasicAuthPassword: "",
+		CAFile:            "",
+		CertFile:          "",
+		KeyFile:           "",
+		Insecure:          true,
+		CacheTTL:          0 * time.Second,
+		IcingaAPIURI:      *u,
+	}
+}
+
+func Test_GetCIBMetrics(t *testing.T) {
+	testcases := map[string]struct {
+		expected CIBResult
+		server   *httptest.Server
+	}{
+		"cib": {
+			server: httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				w.WriteHeader(http.StatusOK)
+				w.Write(loadTestdata(icingaTestDataCIB1))
+			})),
+			expected: CIBResult{
+				Results: []struct {
+					Name   string             `json:"name"`
+					Status map[string]float64 `json:"status,omitempty"`
+				}{
+					{
+						Name: "CIB",
+						Status: map[string]float64{
+							"active_host_checks": 0.123,
+							"uptime":             123.456,
+						},
+					},
+				},
+			},
+		},
+	}
+
+	for name, test := range testcases {
+		t.Run(name, func(t *testing.T) {
+			defer test.server.Close()
+
+			cfg := testConfig(test.server)
+
+			cli, _ := NewClient(cfg)
+
+			actual, err := cli.GetCIBMetrics()
+
+			if err != nil {
+				t.Fatalf("did not expect error got:\n %+v", err)
+			}
+
+			if !reflect.DeepEqual(test.expected, actual) {
+				t.Fatalf("expected:\n %+v \ngot:\n %+v", test.expected, actual)
+			}
+		})
+	}
+}
diff --git a/internal/icinga/testdata/cib1.json b/internal/icinga/testdata/cib1.json
new file mode 100644
index 0000000..784d54d
--- /dev/null
+++ b/internal/icinga/testdata/cib1.json
@@ -0,0 +1,12 @@
+{
+    "results": [
+        {
+            "name": "CIB",
+            "perfdata": [],
+            "status": {
+                "active_host_checks": 0.123,
+                "uptime": 123.456
+            }
+        }
+    ]
+}