Add IDbProfiler shimming example to tests

See #316

Author: NickCraver

tests/MiniProfiler.Tests/DbProfilerTests.cs

@@ -292,6 +292,39 @@ public async Task TrackingOptionsAsync(bool track)
             CheckConnectionTracking(track, profiler, cmdString, true);
         }
 
+        [Fact]
+        public void ShimProfiler()
+        {
+            var options = new MiniProfilerTestOptions {};
+            var profiler = options.StartProfiler("Shimming");
+            var currentDbProfiler = new CurrentDbProfiler(() => profiler);
+
+            const string cmdString = "Select 1";
+            GetUnopenedConnection(currentDbProfiler).Query(cmdString);
+
+            CheckConnectionTracking(false, profiler, cmdString, false);
+        }
+
+        private class CurrentDbProfiler : IDbProfiler
+        {
+            private Func<IDbProfiler> GetProfiler { get; }
+            public CurrentDbProfiler(Func<IDbProfiler> getProfiler) => GetProfiler = getProfiler;
+
+            public bool IsActive => ((IDbProfiler)MiniProfiler.Current)?.IsActive ?? false;
+
+            public void ExecuteFinish(IDbCommand profiledDbCommand, SqlExecuteType executeType, DbDataReader reader) =>
+                GetProfiler()?.ExecuteFinish(profiledDbCommand, executeType, reader);
+
+            public void ExecuteStart(IDbCommand profiledDbCommand, SqlExecuteType executeType) =>
+                GetProfiler()?.ExecuteStart(profiledDbCommand, executeType);
+
+            public void OnError(IDbCommand profiledDbCommand, SqlExecuteType executeType, Exception exception) =>
+                GetProfiler()?.OnError(profiledDbCommand, executeType, exception);
+
+            public void ReaderFinish(IDataReader reader) =>
+                GetProfiler()?.ReaderFinish(reader);
+        }
+
         private void CheckConnectionTracking(bool track, MiniProfiler profiler, string command, bool async)
         {
             Assert.NotNull(profiler.Root.CustomTimings);
@@ -312,7 +345,7 @@ private void CheckConnectionTracking(bool track, MiniProfiler profiler, string c
             }
         }
 
-        private ProfiledDbConnection GetUnopenedConnection(MiniProfiler profiler) => new ProfiledDbConnection(Fixture.GetConnection(), profiler);
+        private ProfiledDbConnection GetUnopenedConnection(IDbProfiler profiler) => new ProfiledDbConnection(Fixture.GetConnection(), profiler);
 
         private CountingConnection GetConnection()
         {