diff --git a/src/config_test.go b/src/config_test.go
new file mode 100644
index 0000000..0643b60
--- /dev/null
+++ b/src/config_test.go
@@ -0,0 +1,32 @@
+package src
+
+import (
+	"os"
+	"testing"
+)
+
+func TestConfigLoadEnv(t *testing.T) {
+	c := Config{
+		Listen:   "default",
+		Forwards: "default",
+		Hello:    "default",
+	}
+
+	os.Setenv("LISTEN", "$LISTEN")
+	os.Setenv("FORWARDS", "")
+	os.Setenv("HELLO_B64", "$HELLO_B64")
+
+	if err := c.loadEnv(); err != nil {
+		t.Fatal(err)
+	}
+
+	if c.Listen != "$LISTEN" {
+		t.Error("listen", c.Listen)
+	}
+	if c.Forwards != "default" {
+		t.Error("forwards", c.Forwards)
+	}
+	if c.Hello != "$HELLO_B64" {
+		t.Error("hello", c.Hello)
+	}
+}