From cb0ae516ae27102bb92bde191b6e798670eee7bc Mon Sep 17 00:00:00 2001
From: Michael Miller <icy.arctic.fox@gmail.com>
Date: Thu, 6 Sep 2018 22:39:40 -0600
Subject: [PATCH] Catch duplicate given blocks with same variable name

---
 src/spectator/dsl.cr | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/spectator/dsl.cr b/src/spectator/dsl.cr
index ce8d5f1..96590d8 100644
--- a/src/spectator/dsl.cr
+++ b/src/spectator/dsl.cr
@@ -110,6 +110,9 @@ module Spectator
     macro given(collection, source_file = __FILE__, source_line = __LINE__, &block)
       context({{collection}}, {{source_file}}, {{source_line}}, "Given") do
         {% var_name = block.args.empty? ? "value" : block.args.first %}
+        {% if GIVEN_VARIABLES.find { |v| v[0].id == var_name.id } %}
+          {% raise "Duplicate given variable name \"#{var_name.id}\"" %}
+        {% end %}
 
         module Locals
           @%wrapper : ValueWrapper?