diff --git a/otellog/go.mod b/otellog/go.mod
index f66f301..a1e6b5d 100644
--- a/otellog/go.mod
+++ b/otellog/go.mod
@@ -1,3 +1,3 @@
 module github.com/d-velop/dvelop-sdk-go/otellog
 
-go 1.17
+go 1.18
diff --git a/otellog/otellogtest/recorder.go b/otellog/otellogtest/recorder.go
new file mode 100644
index 0000000..83fdcf8
--- /dev/null
+++ b/otellog/otellogtest/recorder.go
@@ -0,0 +1,91 @@
+package otellogtest
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/d-velop/dvelop-sdk-go/otellog"
+)
+
+type testingT interface {
+	Errorf(format string, args ...any)
+	Helper()
+}
+
+type LogRecorder struct {
+	Events []otellog.Event
+	t      testingT
+}
+
+// NewLogRecorder creates a new LogRecorder that can be used to assert log messages.
+// The given testingT is used to fail the test if an assertion fails.
+// The default log output formatter is replaced with a formatter that records all log messages.
+// The default time function is replaced with a function that always returns the same time (2022-01-01 01:02:03.000000004 UTC).
+func NewLogRecorder(t testingT) *LogRecorder {
+	otellog.Default().Reset()
+	rec := &LogRecorder{[]otellog.Event{}, t}
+
+	otellog.SetOutputFormatter(func(event *otellog.Event) ([]byte, error) {
+		rec.Events = append(rec.Events, *event)
+		return []byte{}, nil
+	})
+
+	otellog.SetTime(func() time.Time {
+		return time.Date(2022, time.January, 01, 1, 2, 3, 4, time.UTC)
+	})
+	return rec
+}
+
+// ShouldHaveLogged asserts that the given log message was logged at some point.
+// The log message can be an otellog.Severity, string or any other type that can be converted to a string.
+// If multiple arguments are given, they are treated as a logical AND.
+func (l *LogRecorder) ShouldHaveLogged(conditions ...any) {
+	l.t.Helper()
+
+	for _, event := range l.Events {
+		if matches(event, conditions...) {
+			return
+		}
+	}
+
+	l.t.Errorf("no log found matching %v", conditions)
+}
+
+func matches(event otellog.Event, conditions ...any) bool {
+	for _, condition := range conditions {
+		switch condition := condition.(type) {
+		case otellog.Severity:
+			if event.Severity != condition {
+				return false
+			}
+		case int:
+			if int(event.Severity) != condition {
+				return false
+			}
+
+		case func(event otellog.Event) bool:
+			if !condition(event) {
+				return false
+			}
+
+		default:
+			bodyAsString := fmt.Sprint(event.Body)
+			conditionAsString := fmt.Sprint(condition)
+			if !strings.Contains(bodyAsString, conditionAsString) {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+func ContainsAttribute(key string, value any) func(event otellog.Event) bool {
+	return func(event otellog.Event) bool {
+		bytes, _ := event.Attributes.MarshalJSON()
+		attributes := map[string]string{}
+		_ = json.Unmarshal(bytes, &attributes)
+		return attributes[key] == value
+	}
+}
diff --git a/otellog/otellogtest/recorder_test.go b/otellog/otellogtest/recorder_test.go
new file mode 100644
index 0000000..7ea7ee1
--- /dev/null
+++ b/otellog/otellogtest/recorder_test.go
@@ -0,0 +1,195 @@
+package otellogtest_test
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/d-velop/dvelop-sdk-go/otellog"
+	"github.com/d-velop/dvelop-sdk-go/otellog/otellogtest"
+)
+
+func TestLogRecorder_givenSomeLog_whenAsserting_thenShouldMatch(t *testing.T) {
+	recorder := otellogtest.NewLogRecorder(t)
+	otellog.Info(context.Background(), "foo")
+
+	recorder.ShouldHaveLogged("foo")
+}
+
+func TestLogRecorder_givenSomeLog_whenAsserting_thenShouldMatchPartially(t *testing.T) {
+	recorder := otellogtest.NewLogRecorder(t)
+	otellog.Info(context.Background(), "foo bar")
+
+	recorder.ShouldHaveLogged("foo")
+}
+
+func TestLogRecorder_givenSomeLog_whenAsserting_thenShouldMatchWithSeverity(t *testing.T) {
+	recorder := otellogtest.NewLogRecorder(t)
+	otellog.Info(context.Background(), "foo")
+
+	recorder.ShouldHaveLogged(otellog.SeverityInfo, "foo")
+}
+
+func TestLogRecorder_givenFunctionMatcher_whenAsserting_thenShouldMatch(t *testing.T) {
+	recorder := otellogtest.NewLogRecorder(t)
+	otellog.Info(context.Background(), "test")
+
+	recorder.ShouldHaveLogged(func(event otellog.Event) bool {
+		return true
+	})
+}
+
+func TestLogRecorder_givenFunctionMatcherNotMatching_whenAsserting_thenShouldNotMatch(t *testing.T) {
+	ft := &fakeTestingT{}
+	recorder := otellogtest.NewLogRecorder(ft)
+	otellog.Info(context.Background(), "test")
+
+	recorder.ShouldHaveLogged(func(event otellog.Event) bool {
+		return false
+	})
+
+	if !ft.failed {
+		t.Error("expected test to fail")
+	}
+}
+
+func TestLogRecorder_givenAttributeMatcher_whenAsserting_thenShouldMatch(t *testing.T) {
+	recorder := otellogtest.NewLogRecorder(t)
+	otellog.WithAdditionalAttributes(map[string]any{"foo": "bar"}).Info(context.Background(), "test")
+
+	recorder.ShouldHaveLogged("test", otellogtest.ContainsAttribute("foo", "bar"))
+}
+
+func TestLogRecorder_givenAttributeMatcherNotMatching_whenAsserting_thenShouldNotMatch(t *testing.T) {
+	ft := &fakeTestingT{}
+	recorder := otellogtest.NewLogRecorder(ft)
+	otellog.WithAdditionalAttributes(map[string]any{"foo": "bar"}).Info(context.Background(), "test")
+
+	recorder.ShouldHaveLogged("test", otellogtest.ContainsAttribute("hello", "world"))
+
+	if !ft.failed {
+		t.Error("expected test to fail")
+	}
+}
+
+func TestLogRecorder_givenOnlySeverity_whenAsserting_thenShouldMatch(t *testing.T) {
+	recorder := otellogtest.NewLogRecorder(t)
+	otellog.Info(context.Background(), "foo")
+	var severity otellog.Severity
+	{
+		severity = otellog.SeverityInfo
+	}
+
+	recorder.ShouldHaveLogged(severity)
+}
+
+func TestLogRecorder_givenSomeLog_whenAsserting_thenShouldNotMatch(t *testing.T) {
+	ft := &fakeTestingT{}
+	recorder := otellogtest.NewLogRecorder(ft)
+	otellog.Info(context.Background(), "foo")
+
+	recorder.ShouldHaveLogged("bar")
+	if !ft.failed {
+		t.Error("expected test to fail")
+	}
+}
+
+func TestLogRecorder_givenSomeLog_whenAsserting_thenShouldNotMatchWithSeverity(t *testing.T) {
+	ft := &fakeTestingT{}
+	recorder := otellogtest.NewLogRecorder(ft)
+	otellog.Info(context.Background(), "foo")
+	var severity otellog.Severity
+	{
+		severity = otellog.SeverityError
+	}
+
+	recorder.ShouldHaveLogged(severity, "foo")
+	if !ft.failed {
+		t.Error("expected test to fail")
+	}
+}
+
+func TestLogRecorder_givenSomeLog_whenAsserting_thenShouldNotMatchWithSeverityOnly(t *testing.T) {
+	ft := &fakeTestingT{}
+	recorder := otellogtest.NewLogRecorder(ft)
+	otellog.Info(context.Background(), "foo")
+
+	recorder.ShouldHaveLogged(otellog.SeverityError)
+	if !ft.failed {
+		t.Error("expected test to fail")
+	}
+}
+
+func TestLogRecorder_givenSomeLog_whenAsserting_thenShouldMatchWithMultipleConditions(t *testing.T) {
+	recorder := otellogtest.NewLogRecorder(t)
+	otellog.Info(context.Background(), "foo bar")
+
+	recorder.ShouldHaveLogged("foo", "bar")
+}
+
+func TestLogRecorder_givenSomeLog_whenAsserting_thenShouldNotMatchWithMultipleConditions(t *testing.T) {
+	ft := &fakeTestingT{}
+	recorder := otellogtest.NewLogRecorder(ft)
+	otellog.Info(context.Background(), "foo bar")
+
+	recorder.ShouldHaveLogged("foo", "baz")
+	if !ft.failed {
+		t.Error("expected test to fail")
+	}
+}
+
+func TestLogRecorder_givenSomeLog_whenAsserting_thenShouldMatchWithStringerThing(t *testing.T) {
+	recorder := otellogtest.NewLogRecorder(t)
+	otellog.Info(context.Background(), thing{"foo"})
+
+	recorder.ShouldHaveLogged(thing{"foo"})
+}
+
+func TestLogRecorder_givenSomeLog_whenAsserting_thenFailsWithCorrectMessage(t *testing.T) {
+	ft := &fakeTestingT{}
+	recorder := otellogtest.NewLogRecorder(ft)
+	otellog.Info(context.Background(), "foo")
+
+	recorder.ShouldHaveLogged("bar")
+	if !ft.failed {
+		t.Error("expected test to fail")
+	}
+	if ft.m != "no log found matching [bar]" {
+		t.Errorf("expected error message to be 'no log found matching [bar]', but was '%v'", ft.m)
+	}
+}
+
+func TestLogRecorder_givenSomeLog_whenAsserting_thenFailsWithCorrectMessageAndSeverity(t *testing.T) {
+	ft := &fakeTestingT{}
+	recorder := otellogtest.NewLogRecorder(ft)
+	otellog.Info(context.Background(), "foo")
+
+	recorder.ShouldHaveLogged(otellog.SeverityError, "bar")
+	if !ft.failed {
+		t.Error("expected test to fail")
+	}
+	if ft.m != "no log found matching [17 bar]" {
+		t.Errorf("expected error message to be 'no log found matching [17 bar]', but was '%v'", ft.m)
+	}
+}
+
+type thing struct {
+	content string
+}
+
+func (t thing) String() string {
+	return t.content
+}
+
+type fakeTestingT struct {
+	failed bool
+	m      string
+}
+
+func (f *fakeTestingT) Errorf(format string, args ...any) {
+	f.failed = true
+	f.m = fmt.Sprintf(format, args...)
+}
+
+func (f *fakeTestingT) Helper() {
+}