1 files changed, 88 insertions, 0 deletions
diff --git a/time_test.go b/time_test.go
new file mode 100644
index 0000000..62d9a79
--- /dev/null
+++ b/time_test.go
@@ -0,0 +1,88 @@
+package pflag
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+	"time"
+)
+
+func setUpTimeVar(t *time.Time, formats []string) *FlagSet {
+	f := NewFlagSet("test", ContinueOnError)
+	f.TimeVar(t, "time", *t, formats, "Time")
+	return f
+}
+
+func TestTime(t *testing.T) {
+	testCases := []struct {
+		input    string
+		success  bool
+		expected time.Time
+	}{
+		{"2022-01-01T01:01:01+00:00", true, time.Date(2022, 1, 1, 1, 1, 1, 0, time.UTC)},
+		{" 2022-01-01T01:01:01+00:00", true, time.Date(2022, 1, 1, 1, 1, 1, 0, time.UTC)},
+		{"2022-01-01T01:01:01+00:00 ", true, time.Date(2022, 1, 1, 1, 1, 1, 0, time.UTC)},
+		{"2022-01-01T01:01:01+02:00", true, time.Date(2022, 1, 1, 1, 1, 1, 0, time.FixedZone("UTC+2", 2*60*60))},
+		{"2022-01-01T01:01:01.01+02:00", true, time.Date(2022, 1, 1, 1, 1, 1, 10000000, time.FixedZone("UTC+2", 2*60*60))},
+		{"Sat, 01 Jan 2022 01:01:01 +0000", true, time.Date(2022, 1, 1, 1, 1, 1, 0, time.UTC)},
+		{"Sat, 01 Jan 2022 01:01:01 +0200", true, time.Date(2022, 1, 1, 1, 1, 1, 0, time.FixedZone("UTC+2", 2*60*60))},
+		{"Sat, 01 Jan 2022 01:01:01 +0000", true, time.Date(2022, 1, 1, 1, 1, 1, 0, time.UTC)},
+		{"", false, time.Time{}},
+		{"not a date", false, time.Time{}},
+		{"2022-01-01 01:01:01", false, time.Time{}},
+		{"2022-01-01T01:01:01", false, time.Time{}},
+		{"01 Jan 2022 01:01:01 +0000", false, time.Time{}},
+		{"Sat, 01 Jan 2022 01:01:01", false, time.Time{}},
+	}
+
+	for i := range testCases {
+		var timeVar time.Time
+		formats := []string{time.RFC3339Nano, time.RFC1123Z}
+		f := setUpTimeVar(&timeVar, formats)
+
+		tc := &testCases[i]
+
+		arg := fmt.Sprintf("--time=%s", tc.input)
+		err := f.Parse([]string{arg})
+		if err != nil && tc.success == true {
+			t.Errorf("expected success, got %q", err)
+			continue
+		} else if err == nil && tc.success == false {
+			t.Errorf("expected failure")
+			continue
+		} else if tc.success {
+			timeResult, err := f.GetTime("time")
+			if err != nil {
+				t.Errorf("Got error trying to fetch the Time flag: %v", err)
+			}
+			if !timeResult.Equal(tc.expected) {
+				t.Errorf("expected %q, got %q", tc.expected.Format(time.RFC3339Nano), timeVar.Format(time.RFC3339Nano))
+			}
+		}
+	}
+}
+
+func usageForTimeFlagSet(t *testing.T, timeVar time.Time) string {
+	t.Helper()
+	formats := []string{time.RFC3339Nano, time.RFC1123Z}
+	f := setUpTimeVar(&timeVar, formats)
+	if err := f.Parse([]string{}); err != nil {
+		t.Fatalf("expected success, got %q", err)
+	}
+	return f.FlagUsages()
+}
+
+func TestTimeDefaultZero(t *testing.T) {
+	usage := usageForTimeFlagSet(t, time.Time{})
+	if strings.Contains(usage, "default") {
+		t.Errorf("expected no default value in usage, got %q", usage)
+	}
+}
+
+func TestTimeDefaultNonZero(t *testing.T) {
+	timeVar := time.Date(2025, 1, 1, 1, 1, 1, 0, time.UTC)
+	usage := usageForTimeFlagSet(t, timeVar)
+	if !strings.Contains(usage, "default") || !strings.Contains(usage, "2025") {
+		t.Errorf("expected default value in usage, got %q", usage)
+	}
+}