Flesh out Optional members swap, reset, emplace, has_value

[folly.git] / folly / test / OptionalTest.cpp

diff --git a/folly/test/OptionalTest.cpp b/folly/test/OptionalTest.cpp
index 091dd9a3714e262669172e99c1a95d35df77eef9..a5e12d1504ef2f38333b9c730b3a8c3786aaa7d5 100644 (file)
--- a/folly/test/OptionalTest.cpp
+++ b/folly/test/OptionalTest.cpp
@@ -16,6 +16,7 @@
 
 #include <folly/Optional.h>
 #include <folly/Portability.h>
+#include <folly/portability/GMock.h>
 #include <folly/portability/GTest.h>
 
 #include <algorithm>
@@ -65,6 +66,28 @@ TEST(Optional, NoDefault) {
   EXPECT_FALSE(x);
 }
 
+TEST(Optional, Emplace) {
+  Optional<std::vector<int>> opt;
+  auto& values1 = opt.emplace(3, 4);
+  EXPECT_THAT(values1, testing::ElementsAre(4, 4, 4));
+  auto& values2 = opt.emplace(2, 5);
+  EXPECT_THAT(values2, testing::ElementsAre(5, 5));
+}
+
+TEST(Optional, EmplaceInitializerList) {
+  Optional<std::vector<int>> opt;
+  auto& values1 = opt.emplace({3, 4, 5});
+  EXPECT_THAT(values1, testing::ElementsAre(3, 4, 5));
+  auto& values2 = opt.emplace({4, 5, 6});
+  EXPECT_THAT(values2, testing::ElementsAre(4, 5, 6));
+}
+
+TEST(Optional, Reset) {
+  Optional<int> opt(3);
+  opt.reset();
+  EXPECT_FALSE(opt);
+}
+
 TEST(Optional, String) {
   Optional<std::string> maybeString;
   EXPECT_FALSE(maybeString);
@@ -318,6 +341,10 @@ TEST(Optional, Swap) {
   EXPECT_EQ("bye", a.value());
 
   swap(a, b);
+  EXPECT_TRUE(a.hasValue());
+  EXPECT_TRUE(b.hasValue());
+  EXPECT_EQ("hello", a.value());
+  EXPECT_EQ("bye", b.value());
 }
 
 TEST(Optional, Comparisons) {