Add test for parsing cli flag

cmd/osv-scanner/fix/main_test.go

@@ -0,0 +1,138 @@
+package fix
+
+import (
+	"slices"
+	"testing"
+
+	"github.com/google/osv-scanner/internal/remediation/upgrade"
+	"github.com/google/osv-scanner/pkg/reporter"
+	"github.com/urfave/cli/v2"
+)
+
+func parseFlags(t *testing.T, flags []string, arguments []string) (*cli.Context, error) {
+	// This is a bit hacky: make a mock App with only the flags we care about.
+	// Then use app.Run() to parse the flags into the cli.Context, which is returned.
+	t.Helper()
+	appFlags := make([]cli.Flag, 0, len(flags))
+	for _, f := range Command(nil, nil, nil).Flags {
+		if slices.ContainsFunc(f.Names(), func(s string) bool { return slices.Contains(flags, s) }) {
+			appFlags = append(appFlags, f)
+		}
+	}
+	var parsedContext *cli.Context
+	app := cli.App{
+		Flags: appFlags,
+		Action: func(ctx *cli.Context) error {
+			t.Helper()
+			parsedContext = ctx
+
+			return nil
+		},
+	}
+	err := app.Run(append([]string{""}, arguments...))
+
+	return parsedContext, err
+}
+
+func TestParseUpgradeConfig(t *testing.T) {
+	t.Parallel()
+	flags := []string{"upgrade-config", "disallow-major-upgrades", "disallow-package-upgrades"}
+
+	tests := []struct {
+		name string
+		args []string
+		want map[string]upgrade.Level
+	}{
+		{
+			name: "default behaviour",
+			args: []string{},
+			want: map[string]upgrade.Level{
+				"foo": upgrade.Major,
+				"bar": upgrade.Major,
+			},
+		},
+		{
+			name: "general level config",
+			args: []string{"--upgrade-config=minor"},
+			want: map[string]upgrade.Level{
+				"foo": upgrade.Minor,
+				"bar": upgrade.Minor,
+			},
+		},
+		{
+			name: "all levels",
+			args: []string{
+				"--upgrade-config", "major:major",
+				"--upgrade-config", "minor:minor",
+				"--upgrade-config", "patch:patch",
+				"--upgrade-config", "none:none",
+			},
+			want: map[string]upgrade.Level{
+				"major": upgrade.Major,
+				"minor": upgrade.Minor,
+				"patch": upgrade.Patch,
+				"none":  upgrade.None,
+				"other": upgrade.Major,
+			},
+		},
+		{
+			name: "package takes precedence over general",
+			args: []string{
+				"--upgrade-config", "pkg1:minor",
+				"--upgrade-config", "none",
+				"--upgrade-config", "pkg2:major",
+			},
+			want: map[string]upgrade.Level{
+				"pkg1": upgrade.Minor,
+				"pkg2": upgrade.Major,
+				"pkg3": upgrade.None,
+			},
+		},
+		{
+			name: "package names with colons",
+			args: []string{
+				"--upgrade-config=none:patch:minor:major",
+				"--upgrade-config=none:patch:minor",
+				"--upgrade-config=none:patch",
+				"--upgrade-config=none",
+			},
+			want: map[string]upgrade.Level{
+				"none:patch:minor": upgrade.Major,
+				"none:patch":       upgrade.Minor,
+				"none":             upgrade.Patch,
+				"other":            upgrade.None,
+			},
+		},
+		{
+			name: "deprecated flag",
+			args: []string{
+				"--disallow-major-upgrades",
+				"--disallow-package-upgrades=pkg1,pkg2",
+				"--upgrade-config=pkg3:patch",
+			},
+			want: map[string]upgrade.Level{
+				"pkg1": upgrade.None,
+				"pkg2": upgrade.None,
+				"pkg3": upgrade.Patch,
+				"pkg4": upgrade.Minor,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			ctx, err := parseFlags(t, flags, tt.args)
+			if err != nil {
+				t.Fatalf("error parsing flags: %v", err)
+			}
+			config := parseUpgradeConfig(ctx, &reporter.VoidReporter{})
+			for pkg, want := range tt.want {
+				if got := config.Get(pkg); got != want {
+					t.Errorf("Config.Get(%s) got = %v, want %v", pkg, got, want)
+				}
+			}
+		})
+	}
+}