From 99eb7132499d14b604d67d8d8104243c3f9a35e6 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Sun, 25 Aug 2013 13:38:14 +0100
Subject: Implement check for duplicate scenario names

---
 yarn | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'yarn')

diff --git a/yarn b/yarn
index 3bb26e8..c13681b 100755
--- a/yarn
+++ b/yarn
@@ -18,6 +18,7 @@
 
 
 import cliapp
+import collections
 import logging
 import os
 import re
@@ -108,6 +109,7 @@ class YarnRunner(cliapp.Application):
                 'step %Index(step,steps): %String(step_name)')
 
         scenarios, implementations = self.parse_scenarios(args)
+        self.check_for_duplicate_scenario_names(scenarios)
         self.check_for_thens(scenarios)
         self.connect_implementations(scenarios, implementations)
         shell_prelude = self.load_shell_libraries()
@@ -158,6 +160,17 @@ class YarnRunner(cliapp.Application):
 
         return block_parser.scenarios, block_parser.implementations
 
+    def check_for_duplicate_scenario_names(self, scenarios):
+        counts = collections.Counter()
+        for s in scenarios:
+            counts[s.name] += 1
+
+        duplicates = [name for name in counts if counts[name] > 1]
+        if duplicates:
+            duplist = ''.join('  %s\n' % name for name in duplicates)
+            raise cliapp.AppException(
+                'There are scenarios with duplicate names:\n%s' % duplist)
+
     def check_for_thens(self, scenarios):
         no_thens = []
         for scenario in scenarios:
-- 
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