Add more tests, refactor to fix problems

Signed-off-by: Patrice Ferlet <metal3d@gmail.com>

cmd/katenary/main_test.go

@@ -0,0 +1,17 @@
+package main
+
+import "testing"
+
+func TestBuildCommand(t *testing.T) {
+	rootCmd := buildRootCmd()
+	if rootCmd == nil {
+		t.Errorf("Expected rootCmd to be defined")
+	}
+	if rootCmd.Use != "katenary" {
+		t.Errorf("Expected rootCmd.Use to be katenary, got %s", rootCmd.Use)
+	}
+	numCommands := 5
+	if len(rootCmd.Commands()) != numCommands {
+		t.Errorf("Expected %d command, got %d", numCommands, len(rootCmd.Commands()))
+	}
+}