From c1b6bd0500c093864859a296c32d068148c84a4d Mon Sep 17 00:00:00 2001
From: King_DuckZ <king_duckz@gmx.com>
Date: Wed, 26 Jul 2017 22:48:39 +0100
Subject: [PATCH] Add unit test for backwards iteration.

---
 test/unit/test_sequence_range.cpp | 35 +++++++++++++++++++++++--------
 1 file changed, 26 insertions(+), 9 deletions(-)

diff --git a/test/unit/test_sequence_range.cpp b/test/unit/test_sequence_range.cpp
index 96bb7a0..8b6de4b 100644
--- a/test/unit/test_sequence_range.cpp
+++ b/test/unit/test_sequence_range.cpp
@@ -26,9 +26,6 @@ TEST(vwr, vector_iterator) {
 
 	ivec3 from(100, 200, 300);
 	ivec3 to(102, 203, 304);
-	auto seq = increasing_sequence_range<ivec3>(from, to);
-	auto it = seq.begin();
-	auto it_end = seq.end();
 
 	std::array<ivec3, 24> expected{
 		ivec3(100, 200, 300),
@@ -56,13 +53,33 @@ TEST(vwr, vector_iterator) {
 		ivec3(100, 202, 303),
 		ivec3(101, 202, 303)
 	};
-	std::vector<ivec3> results;
-	for (; it != it_end; ++it) {
-		results.push_back(*it);
+
+	{
+		auto seq = increasing_sequence_range<ivec3>(from, to);
+		auto it = seq.begin();
+		auto it_end = seq.end();
+
+		std::vector<ivec3> results;
+		for (; it != it_end; ++it) {
+			results.push_back(*it);
+		}
+
+		EXPECT_EQ(expected.size(), results.size());
+		for (std::size_t z = 0; z < expected.size(); ++z) {
+			EXPECT_EQ(expected[z], results[z]);
+		}
 	}
 
-	EXPECT_EQ(expected.size(), results.size());
-	for (std::size_t z = 0; z < expected.size(); ++z) {
-		EXPECT_EQ(expected[z], results[z]);
+	{
+		using dec_sequence_range = sequence_range<ivec3, op::dec<int64_t>, std::greater<int64_t>, 0, 1, 2>;
+		std::vector<ivec3> results;
+		for (auto& itm : dec_sequence_range(to, from)) {
+			results.push_back(itm);
+		}
+
+		EXPECT_EQ(expected.size(), results.size());
+		for (std::size_t z = 0; z < expected.size(); ++z) {
+			EXPECT_EQ(expected[z] + 1, results[results.size() - 1 - z]);
+		}
 	}
 }