fleshing out

README.md

@@ -5,7 +5,7 @@ Go language (golang) cron expression parser. Given a cron expression and a time
 
 The reference documentation for this implementation is found at
 https://en.wikipedia.org/wiki/Cron#CRON_expression, with the following
-difference:
+differences:
 
 * Supports the second field (before minute field)
 * If five fields are present, a wildcard year field is appended

cronexpression.go

@@ -1,7 +1,7 @@
 /*!
  * Copyright 2013 Raymond Hill
  *
- * Project: github.com/gorhill/gocronexpression
+ * Project: github.com/gorhill/cronexpression
  * File: cronexpression.go
  * Version: 1.0
  * License: GPL v3 see <https://www.gnu.org/licenses/gpl.html>

cronexpression_test.go

@@ -0,0 +1,109 @@
+/*!
+ * Copyright 2013 Raymond Hill
+ *
+ * Project: github.com/gorhill/cronexpression
+ * File: cronexpression_test.go
+ * Version: 1.0
+ * License: GPL v3 see <https://www.gnu.org/licenses/gpl.html>
+ *
+ */
+
+package cronexpression_test
+
+/******************************************************************************/
+
+import (
+	"cronexpression"
+	"testing"
+	"time"
+)
+
+/******************************************************************************/
+
+type crontimes struct {
+    from string
+    next string
+}
+
+type crontest struct {
+	expr string
+    layout string
+    times []crontimes
+}
+
+var crontests = []crontest{
+    // Seconds
+    {
+        "* * * * * * *",
+        "2006-01-02 15:04:05",
+        []crontimes{
+            {"2013-01-01 00:00:00", "2013-01-01 00:00:01"},
+            {"2013-01-01 00:00:59", "2013-01-01 00:01:00"},
+            {"2013-01-01 23:59:59", "2013-01-02 00:00:00"},
+            {"2013-02-28 23:59:59", "2013-03-01 00:00:00"},
+            {"2016-02-28 23:59:59", "2016-02-29 00:00:00"},
+            {"2012-12-31 23:59:59", "2013-01-01 00:00:00"},
+        },
+    },
+
+    // Minutes
+    {
+        "* * * * *",
+        "2006-01-02 15:04:05",
+        []crontimes{
+            {"2013-01-01 00:00:00", "2013-01-01 00:01:00"},
+            {"2013-01-01 00:00:59", "2013-01-01 00:01:00"},
+            {"2013-01-01 00:59:00", "2013-01-01 01:00:00"},
+            {"2013-01-01 23:59:00", "2013-01-02 00:00:00"},
+            {"2013-02-28 23:59:00", "2013-03-01 00:00:00"},
+            {"2016-02-28 23:59:00", "2016-02-29 00:00:00"},
+            {"2012-12-31 23:59:00", "2013-01-01 00:00:00"},
+        },
+    },
+
+    // Minutes with intervals
+    {
+        "17-43/5 * * * *",
+        "2006-01-02 15:04:05",
+        []crontimes{
+            {"2013-01-01 00:00:00", "2013-01-01 00:17:00"},
+            {"2013-01-01 00:16:59", "2013-01-01 00:17:00"},
+            {"2013-01-01 00:30:00", "2013-01-01 00:32:00"},
+            {"2013-01-01 00:50:00", "2013-01-01 01:17:00"},
+            {"2013-01-01 23:50:00", "2013-01-02 00:17:00"},
+            {"2013-02-28 23:50:00", "2013-03-01 00:17:00"},
+            {"2016-02-28 23:50:00", "2016-02-29 00:17:00"},
+            {"2012-12-31 23:50:00", "2013-01-01 00:17:00"},
+        },
+    },
+
+    // Minutes interval, list
+    {
+        "15-30/4,55 * * * *",
+        "2006-01-02 15:04:05",
+        []crontimes{
+            {"2013-01-01 00:00:00", "2013-01-01 00:15:00"},
+            {"2013-01-01 00:16:00", "2013-01-01 00:19:00"},
+            {"2013-01-01 00:30:00", "2013-01-01 00:55:00"},
+            {"2013-01-01 00:55:00", "2013-01-01 01:15:00"},
+            {"2013-01-01 23:55:00", "2013-01-02 00:15:00"},
+            {"2013-02-28 23:55:00", "2013-03-01 00:15:00"},
+            {"2016-02-28 23:55:00", "2016-02-29 00:15:00"},
+            {"2012-12-31 23:55:00", "2013-01-01 00:15:00"},
+        },
+    },
+
+    // TODO: more tests
+}
+
+func TestCronExpressions(t *testing.T) {
+	for _, test := range crontests {
+        for _, times := range test.times {
+		    from, _ := time.Parse("2006-01-02 15:04:05", times.from)
+		    next := cronexpression.NextTimeFromCronString(test.expr, from)
+		    if next.Format(test.layout) != times.next {
+			    t.Errorf("(\"%s\").NextTime(\"%s\") = \"%s\", got \"%s\"", test.expr, times.from, times.next, next.Format(test.layout))
+            }
+		}
+	}
+}