Add validation test

cmd/cmd_test.go

@@ -0,0 +1,63 @@
+package cmd
+
+import (
+	"testing"
+
+	"github.com/Ladicle/kubectl-rolesum/pkg/util/subject"
+)
+
+func TestValidate(t *testing.T) {
+	tests := []struct {
+		desc      string
+		args      []string
+		option    Option
+		wantError bool
+	}{
+		{
+			desc: "Use Service Account",
+			args: []string{"ci-bot"},
+			option: Option{
+				SubjectKind: subject.KindSA,
+			},
+		},
+		{
+			desc: "Use User",
+			args: []string{"alice"},
+			option: Option{
+				SubjectKind: subject.KindUser,
+			},
+		},
+		{
+			desc: "Use Group",
+			args: []string{"developer"},
+			option: Option{
+				SubjectKind: subject.KindGroup,
+			},
+		},
+		{
+			desc:      "No arguments",
+			wantError: true,
+		},
+		{
+			desc: "Unknown subject kind",
+			option: Option{
+				SubjectKind: "unknown",
+			},
+			wantError: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			err := tt.option.Validate(nil, tt.args)
+			if err != nil {
+				if !tt.wantError {
+					t.Fatalf("o.Validate(): %v", err)
+				}
+				return
+			}
+			if tt.wantError {
+				t.Fatal("o.Validate() should fail")
+			}
+		})
+	}
+}