feat(golang-rewrite): add simple test for completions package

internal/completions/completions_test.go

@@ -0,0 +1,30 @@
+package completions
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGet(t *testing.T) {
+	t.Run("returns file when completion file found with matching name", func(t *testing.T) {
+		file, found := Get("bash")
+
+		info, err := file.Stat()
+		assert.Nil(t, err)
+		assert.Equal(t, "asdf.bash", info.Name())
+
+		assert.True(t, found)
+	})
+
+	t.Run("returns false when completion file not found", func(t *testing.T) {
+		_, found := Get("non-existent")
+		assert.False(t, found)
+	})
+}
+
+func TestNames(t *testing.T) {
+	t.Run("returns slice of shell names for which completion is available", func(t *testing.T) {
+		assert.Equal(t, []string{"bash", "elvish", "fish", "nushell", "zsh"}, Names())
+	})
+}