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diff --git a/tests/unit/vcomponent/duration.scm b/tests/unit/vcomponent/duration.scm
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+(define-module (test duration)
+  :use-module (srfi srfi-64)
+  :use-module (srfi srfi-64 test-error)
+  :use-module (srfi srfi-71)
+  :use-module (srfi srfi-88)
+  :use-module (datetime)
+  :use-module (vcomponent duration))
+
+;;; Tests extracted from RFC5545 through the following script
+;; #!/bin/sh
+;; dur_day="[0-9]+D"
+;; dur_second="[0-9]+S"
+;; dur_minute="[0-9]+M($dur_second)?"
+;; dur_hour="[0-9]+H($dur_minute)?"
+;; dur_week="[0-9]+W"
+;; dur_time="T($dur_hour|$dur_minute|$dur_second)"
+;; dur_date="$dur_day($dur_time)?"
+;; dur_value="[+-]?P($dur_date|$dur_time|$dur_week)"
+;; grep -o -E "$dur_value" ~/.local/doc/rfc/rfc5545.txt
+
+
+(test-group "Parse duration"
+ (test-equal (duration day: 15
+                       time: (time hour: 5 second: 20))
+   (parse-duration "P15DT5H0M20S"))
+ (test-equal (duration sign: '- day: 2) (parse-duration "-P2D"))
+ (test-equal (duration week: 7) (parse-duration "P7W"))
+ (test-equal (duration sign: '- time: (time minute: 15))
+   (parse-duration "-PT15M"))
+ (test-equal (duration time: (time minute: 15))
+   (parse-duration "PT15M"))
+ (test-equal (duration time: (time hour: 1))
+   (parse-duration "PT1H"))
+ (test-equal (duration time: (time hour: 1))
+   (parse-duration "PT1H0M0S"))
+ (test-equal (duration sign: '- time: (time minute: 30))
+   (parse-duration "-PT30M"))
+ (test-equal (duration time: (time hour: 3))
+   (parse-duration "PT3H"))
+ (test-equal (duration time: (time hour: 5 minute: 30))
+   (parse-duration "PT5H30M"))
+ (test-equal (duration time: (time minute: 5))
+   (parse-duration "PT5M"))
+ (test-equal (duration time: (time hour: 6 minute: 30))
+   (parse-duration "PT6H30M"))
+ (test-equal (duration time: (time hour: 8 minute: 30))
+   (parse-duration "PT8H30M")))
+
+(test-group "Format duration"
+  (test-equal "P15DT5H1M20S"
+    (format-duration (duration
+                      day: 15
+                      time: (time hour: 5 minute: 1 second: 20))))
+  (test-equal "-P7W"
+    (format-duration (duration week: 7 sign: '-))))
+
+(test-error "Failure to construct invalid duration"
+  'misc-error
+  (duration week: 1 day: 1))
+
+(test-error "Completely wrong duration"
+  'parse-error
+  (parse-duration "Something weird"))
+
+(test-error "Duration with extra fluff at end"
+  'warning
+  (parse-duration "-P7WH"))
+
+
+
+'((vcomponent duration))