[#6] Add new 'tests' command

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

cmd/parser/modules/tests.go

@@ -0,0 +1,75 @@
+package modules
+
+import (
+	"fmt"
+	"os"
+	"slices"
+	"sort"
+
+	"git.frostfs.info/TrueCloudLab/s3-tests-parser/internal/s3"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var testsCmd = &cobra.Command{
+	Use:   "tests",
+	Short: "Print tests to check",
+	Long:  "Print all tests that will be checked by 'compatibility' command",
+	Example: `s3-tests-parser tests
+s3-tests-parser tests --output tests.txt`,
+	RunE: runTestsCmd,
+}
+
+func initTestsCmd() {
+	testsCmd.Flags().String(outputFlag, "", "file to write output, if missed the stdout is used")
+}
+
+func runTestsCmd(cmd *cobra.Command, _ []string) error {
+	testStruct, err := s3.ParseTestsStruct()
+	if err != nil {
+		return err
+	}
+
+	var tests []string
+
+	groupTests := make(map[string][]string)
+	for _, group := range testStruct.Groups {
+		groupTests[group.Name] = group.Tests
+	}
+
+	for _, group := range testStruct.Groups {
+		if group.Skip {
+			continue
+		}
+
+		tests = append(tests, group.Tests...)
+		for _, include := range group.Include {
+			tests = append(tests, groupTests[include]...)
+		}
+	}
+
+	sort.Strings(tests)
+	tests = slices.Compact(tests)
+
+	return printTests(cmd, tests)
+}
+
+func printTests(cmd *cobra.Command, res []string) error {
+	w := cmd.OutOrStdout()
+	if outFile := viper.GetString(outputFlag); outFile != "" {
+		f, err := os.Create(outFile)
+		if err != nil {
+			return fmt.Errorf("create out file: %w", err)
+		}
+		w = f
+		defer f.Close()
+	}
+
+	for i := range res {
+		if _, err := fmt.Fprintln(w, res[i]); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}