diff --git a/cmdx/env_test.go b/cmdx/env_test.go
new file mode 100644
index 00000000..1afade08
--- /dev/null
+++ b/cmdx/env_test.go
@@ -0,0 +1,10 @@
+package cmdx
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestEnvVarExamplesHelpMessage(t *testing.T) {
+	assert.NotEmpty(t, EnvVarExamplesHelpMessage(""))
+}
diff --git a/corsx/corsx_test.go b/corsx/corsx_test.go
index 09a2a26e..822eb537 100644
--- a/corsx/corsx_test.go
+++ b/corsx/corsx_test.go
@@ -1 +1,10 @@
 package corsx
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestHelpMessage(t *testing.T) {
+	assert.NotEmpty(t, HelpMessage())
+}
diff --git a/urlx/join_test.go b/urlx/join_test.go
new file mode 100644
index 00000000..9dc94f36
--- /dev/null
+++ b/urlx/join_test.go
@@ -0,0 +1,10 @@
+package urlx
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestJoin(t *testing.T) {
+	assert.EqualValues(t, "http://foo/bar/baz/bar", MustJoin("http://foo", "bar/", "/baz", "bar"))
+}