diff --git a/config_test.go b/config_test.go
new file mode 100644
index 00000000..fbb8ccc4
--- /dev/null
+++ b/config_test.go
@@ -0,0 +1,36 @@
+package xop
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestConfig(t *testing.T) {
+	seed := NewSeed()
+	assert.Equal(t, DefaultConfig.UseB3, seed.config.UseB3)
+	assert.Equal(t, DefaultConfig.FlushDelay, seed.config.FlushDelay)
+
+	seed = NewSeed(WithConfig(DefaultConfig), WithB3(true))
+	assert.Equal(t, true, seed.config.UseB3)
+	assert.Equal(t, DefaultConfig.FlushDelay, seed.config.FlushDelay)
+
+	seed = NewSeed(WithB3(true), WithFlushDelay(time.Second))
+	assert.Equal(t, true, seed.config.UseB3)
+	assert.Equal(t, time.Second, seed.config.FlushDelay)
+}
+
+func TestConfigModifier(t *testing.T) {
+	configModifier := func(cfg *Config) {
+		cfg.UseB3 = true
+	}
+	seed := NewSeed(WithConfigChanges(configModifier))
+	assert.Equal(t, true, seed.config.UseB3)
+}
+
+func TestLogConfig(t *testing.T) {
+	myLog := NewSeed().Request("myLog")
+	assert.Equal(t, DefaultConfig.FlushDelay, myLog.Config().FlushDelay)
+	assert.Equal(t, DefaultConfig.UseB3, myLog.Config().UseB3)
+}