diff --git a/test_cron.py b/test_cron.py
new file mode 100644
index 0000000..90c50fd
--- /dev/null
+++ b/test_cron.py
@@ -0,0 +1,92 @@
+from croniter import croniter, CroniterBadCronError, CroniterBadDateError
+from datetime import datetime, timezone
+import sys
+
+# ── Common cron expressions to test ──────────────────────────────────────────
+EXAMPLES = [
+    ("* * * * *",        "Every minute"),
+    ("*/15 * * * *",     "Every 15 minutes"),
+    ("0 * * * *",        "Every hour (on the hour)"),
+    ("0 9 * * *",        "Every day at 09:00"),
+    ("0 9 * * 1-5",      "Weekdays at 09:00"),
+    ("0 9 * * 1",        "Every Monday at 09:00"),
+    ("0 0 1 * *",        "First day of every month at midnight"),
+    ("0 0 1 1 *",        "Every January 1st at midnight (yearly)"),
+    ("30 6 * * 0,6",     "Weekends at 06:30"),
+    ("0 */6 * * *",      "Every 6 hours"),
+    ("0 9,17 * * 1-5",   "Weekdays at 09:00 and 17:00"),
+    ("INVALID CRON",     "❌ Bad expression (should fail gracefully)"),
+]
+
+HOW_MANY_NEXT = 5          # next N occurrences to display
+BASE_TIME     = datetime.now(timezone.utc).replace(second=0, microsecond=0)
+
+# ── Helpers ───────────────────────────────────────────────────────────────────
+def describe_field(value, unit):
+    if value == "*":
+        return f"every {unit}"
+    if value.startswith("*/"):
+        return f"every {value[2:]} {unit}(s)"
+    if "-" in value:
+        a, b = value.split("-", 1)
+        return f"{unit}s {a}–{b}"
+    if "," in value:
+        return f"{unit}s {value}"
+    return f"{unit} {value}"
+
+WEEKDAY_NAMES = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
+MONTH_NAMES   = ["Jan","Feb","Mar","Apr","May","Jun",
+                 "Jul","Aug","Sep","Oct","Nov","Dec"]
+
+def human_readable(expr):
+    parts = expr.split()
+    if len(parts) != 5:
+        return "  ⚠  Cannot parse (need exactly 5 fields)"
+    minute, hour, dom, month, dow = parts
+    return (
+        f"  minute : {describe_field(minute, 'minute')}\n"
+        f"  hour   : {describe_field(hour,   'hour')}\n"
+        f"  day/mo : {describe_field(dom,    'day-of-month')}\n"
+        f"  month  : {describe_field(month,  'month')}\n"
+        f"  day/wk : {describe_field(dow,    'day-of-week')}"
+    )
+
+def test_expression(expr, label):
+    print(f"\n{'='*62}")
+    print(f"  EXPRESSION : {expr}")
+    print(f"  LABEL      : {label}")
+    print(f"{'='*62}")
+
+    try:
+        cron = croniter(expr, BASE_TIME)
+    except (CroniterBadCronError, CroniterBadDateError, KeyError, ValueError) as e:
+        print(f"  ❌  INVALID EXPRESSION — {e}")
+        return
+
+    print("  ✅  Valid expression")
+    print(human_readable(expr))
+
+    print(f"\n  Next {HOW_MANY_NEXT} occurrences (from {BASE_TIME.strftime('%Y-%m-%d %H:%M')} UTC):")
+    cron2 = croniter(expr, BASE_TIME)          # fresh iterator
+    for i in range(HOW_MANY_NEXT):
+        nxt = cron2.get_next(datetime)
+        print(f"    {i+1}. {nxt.strftime('%Y-%m-%d %H:%M %Z')}")
+
+    print(f"\n  Previous {HOW_MANY_NEXT} occurrences:")
+    cron3 = croniter(expr, BASE_TIME)
+    for i in range(HOW_MANY_NEXT):
+        prv = cron3.get_prev(datetime)
+        print(f"    {i+1}. {prv.strftime('%Y-%m-%d %H:%M %Z')}")
+
+# ── Run tests ─────────────────────────────────────────────────────────────────
+print(f"\n{'#'*62}")
+print(f"  CRON SCHEDULE TESTER")
+print(f"  Reference time : {BASE_TIME.strftime('%Y-%m-%d %H:%M')} UTC")
+print(f"{'#'*62}")
+
+for expr, label in EXAMPLES:
+    test_expression(expr, label)
+
+print(f"\n{'#'*62}")
+print("  ALL TESTS COMPLETE")
+print(f"{'#'*62}\n")