1 files changed, 77 insertions, 0 deletions
diff --git a/absl/container/inlined_vector_test.cc b/absl/container/inlined_vector_test.cc
index 8527ba1aa008..0e39855b3066 100644
--- a/absl/container/inlined_vector_test.cc
+++ b/absl/container/inlined_vector_test.cc
@@ -407,6 +407,69 @@ TEST(InlinedVectorTest, EmplaceBack) {
   EXPECT_EQ(allocated_element.second, 1729);
 }
 
+TEST(InlinedVectorTest, ShrinkToFitGrowingVector) {
+  absl::InlinedVector<std::pair<std::string, int>, 1> v;
+
+  v.shrink_to_fit();
+  EXPECT_EQ(v.capacity(), 1);
+
+  v.emplace_back("answer", 42);
+  v.shrink_to_fit();
+  EXPECT_EQ(v.capacity(), 1);
+
+  v.emplace_back("taxicab", 1729);
+  EXPECT_GE(v.capacity(), 2);
+  v.shrink_to_fit();
+  EXPECT_EQ(v.capacity(), 2);
+
+  v.reserve(100);
+  EXPECT_GE(v.capacity(), 100);
+  v.shrink_to_fit();
+  EXPECT_EQ(v.capacity(), 2);
+}
+
+TEST(InlinedVectorTest, ShrinkToFitEdgeCases) {
+  {
+    absl::InlinedVector<std::pair<std::string, int>, 1> v;
+    v.emplace_back("answer", 42);
+    v.emplace_back("taxicab", 1729);
+    EXPECT_GE(v.capacity(), 2);
+    v.pop_back();
+    v.shrink_to_fit();
+    EXPECT_EQ(v.capacity(), 1);
+    EXPECT_EQ(v[0].first, "answer");
+    EXPECT_EQ(v[0].second, 42);
+  }
+
+  {
+    absl::InlinedVector<std::string, 2> v(100);
+    v.resize(0);
+    v.shrink_to_fit();
+    EXPECT_EQ(v.capacity(), 2);  // inlined capacity
+  }
+
+  {
+    absl::InlinedVector<std::string, 2> v(100);
+    v.resize(1);
+    v.shrink_to_fit();
+    EXPECT_EQ(v.capacity(), 2);  // inlined capacity
+  }
+
+  {
+    absl::InlinedVector<std::string, 2> v(100);
+    v.resize(2);
+    v.shrink_to_fit();
+    EXPECT_EQ(v.capacity(), 2);
+  }
+
+  {
+    absl::InlinedVector<std::string, 2> v(100);
+    v.resize(3);
+    v.shrink_to_fit();
+    EXPECT_EQ(v.capacity(), 3);
+  }
+}
+
 TEST(IntVec, Insert) {
   for (int len = 0; len < 20; len++) {
     for (int pos = 0; pos <= len; pos++) {
@@ -1589,6 +1652,20 @@ TEST(AllocatorSupportTest, CountAllocations) {
     AllocVec v3(std::move(v), alloc3);
     EXPECT_THAT(allocated3, v3.size() * sizeof(int));
   }
+  EXPECT_EQ(allocated, 0);
+  {
+    // Test shrink_to_fit deallocations.
+    AllocVec v(8, 2, alloc);
+    EXPECT_EQ(allocated, 8 * sizeof(int));
+    v.resize(5);
+    EXPECT_EQ(allocated, 8 * sizeof(int));
+    v.shrink_to_fit();
+    EXPECT_EQ(allocated, 5 * sizeof(int));
+    v.resize(4);
+    EXPECT_EQ(allocated, 5 * sizeof(int));
+    v.shrink_to_fit();
+    EXPECT_EQ(allocated, 0);
+  }
 }
 
 TEST(AllocatorSupportTest, SwapBothAllocated) {