add docstrings

Author: rubenhoenle

internal/pkg/testutils/testing.go renamed to internal/pkg/testutils/testutils.go

@@ -10,10 +10,13 @@ import (
 	"github.com/stackitcloud/stackit-cli/internal/pkg/print"
 )
 
+// TestParseInput centralizes the logic to test a combination of inputs (arguments, flags) for a cobra command
 func TestParseInput[T any](t *testing.T, cmdFactory func(*params.CmdParams) *cobra.Command, parseInputFunc func(*print.Printer, *cobra.Command, []string) (T, error), expectedModel T, argValues []string, flagValues map[string]string, isValid bool) {
 	TestParseInputWithAdditionalFlags(t, cmdFactory, parseInputFunc, expectedModel, argValues, flagValues, map[string][]string{}, isValid)
 }
 
+// TestParseInputWithAdditionalFlags centralizes the logic to test a combination of inputs (arguments, flags) for a cobra command.
+// It allows to pass multiple instances of a single flag to the cobra command using the `additionalFlagValues` parameter.
 func TestParseInputWithAdditionalFlags[T any](t *testing.T, cmdFactory func(*params.CmdParams) *cobra.Command, parseInputFunc func(*print.Printer, *cobra.Command, []string) (T, error), expectedModel T, argValues []string, flagValues map[string]string, additionalFlagValues map[string][]string, isValid bool) {
 	p := print.NewPrinter()
 	cmd := cmdFactory(&params.CmdParams{Printer: p})