From ae41c69ff2684ad2d80841948e0bed203a0b7504 Mon Sep 17 00:00:00 2001
From: Grigoriy Chudnov <g.chudnov@gmail.com>
Date: Mon, 19 Dec 2016 16:35:12 +0300
Subject: decouple pairwise from observable

---
 Rx/v2/test/operators/pairwise.cpp | 42 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 39 insertions(+), 3 deletions(-)

(limited to 'Rx/v2/test/operators/pairwise.cpp')

diff --git a/Rx/v2/test/operators/pairwise.cpp b/Rx/v2/test/operators/pairwise.cpp
index 20da0d8..7ba0c42 100644
--- a/Rx/v2/test/operators/pairwise.cpp
+++ b/Rx/v2/test/operators/pairwise.cpp
@@ -1,6 +1,7 @@
 #include "../test.h"
+#include "rxcpp/operators/rx-pairwise.hpp"
 
-SCENARIO("pairwise", "[pairwise][operators]") {
+SCENARIO("pairwise - enough items to create pairs", "[pairwise][operators]") {
     GIVEN("a cold observable of n ints") {
         auto sc = rxsc::make_test();
         auto w = sc.create_worker();
@@ -22,9 +23,9 @@ SCENARIO("pairwise", "[pairwise][operators]") {
             auto res = w.start(
                 [xs, &invoked]() {
                     return xs
-                        .pairwise()
+                        | rxo::pairwise()
                         // forget type to workaround lambda deduction bug on msvc 2013
-                        .as_dynamic();
+                        | rxo::as_dynamic();
                 }
             );
 
@@ -43,3 +44,38 @@ SCENARIO("pairwise", "[pairwise][operators]") {
         }
     }
 }
+
+SCENARIO("pairwise - not enough items to create a pair", "[pairwise][operators]") {
+    GIVEN("a cold observable of 1 ints") {
+        auto sc = rxsc::make_test();
+        auto w = sc.create_worker();
+        const rxsc::test::messages<int> on;
+        const rxsc::test::messages<std::tuple<int, int>> on_pairwise;
+
+        auto xs = sc.make_cold_observable({
+            on.next(180, 1),
+            on.completed(400),
+        });
+
+        WHEN("taken pairwise") {
+
+            auto res = w.start(
+                [xs]() {
+                    return xs
+                        .pairwise()
+                        // forget type to workaround lambda deduction bug on msvc 2013
+                        .as_dynamic();
+                }
+            );
+
+            THEN("the output contains no tuples of ints"){
+                auto delay = rxcpp::schedulers::test::subscribed_time;
+                auto required = rxu::to_vector({
+                    on_pairwise.completed(400 + delay)
+                });
+                auto actual = res.get_observer().messages();
+                REQUIRE(required == actual);
+            }
+        }
+    }
+}
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