From 603b212522b8d37cf751f9ae069d20c6f9da08a9 Mon Sep 17 00:00:00 2001
From: Marc Gravell <marc.gravell@gmail.com>
Date: Tue, 26 Jul 2016 12:52:38 +0100
Subject: [PATCH] Added tests to complement documentation of pseudo-positional
 parameters

---
 Dapper.Tests/Tests.cs | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/Dapper.Tests/Tests.cs b/Dapper.Tests/Tests.cs
index e90e2e6..8126536 100644
--- a/Dapper.Tests/Tests.cs
+++ b/Dapper.Tests/Tests.cs
@@ -3315,6 +3315,38 @@ public void Issue569_SO38527197_PseudoPositionalParameters_In()
             }
         }
 
+        [Fact]
+        public void PseudoPositional_CanUseVariable()
+        {
+            using (var connection = ConnectViaOledb())
+            {
+                int id = 42;
+                var row = connection.QuerySingle("declare @id int = ?id?; select @id as [A], @id as [B];", new { id });
+                int a = (int)row.A;
+                int b = (int)row.B;
+                a.IsEqualTo(42);
+                b.IsEqualTo(42);
+            }
+        }
+        [Fact]
+        public void PseudoPositional_CannotUseParameterMultipleTimes()
+        {
+
+            using (var connection = ConnectViaOledb())
+            {
+                try
+                {
+                    int id = 42;
+                    var row = connection.QuerySingle("select ?id? as [A], ?id? as [B];", new { id });
+                    Assert.Fail();
+                }
+                catch (InvalidOperationException ex) when (ex.Message == "When passing parameters by position, each parameter can only be referenced once")
+                {
+                    // that's a win
+                }
+            }
+        }
+
         [Fact]
         public void PseudoPositionalParameters_ExecSingle()
         {
-- 
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