[SmallSet] Add some simple unit tests.

Reviewers: craig.topper, dblaikie

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D47940


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334321 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/ADT/CMakeLists.txt

@@ -51,6 +51,7 @@ add_llvm_unittest(ADTTests
   SetVectorTest.cpp
   SimpleIListTest.cpp
   SmallPtrSetTest.cpp
+  SmallSetTest.cpp
   SmallStringTest.cpp
   SmallVectorTest.cpp
   SparseBitVectorTest.cpp

unittests/ADT/SmallSetTest.cpp

+//===- llvm/unittest/ADT/SmallSetTest.cpp ------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// SmallSet unit tests.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/SmallSet.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+TEST(SmallSetTest, Insert) {
+
+  SmallSet<int, 4> s1;
+
+  for (int i = 0; i < 4; i++)
+    s1.insert(i);
+
+  for (int i = 0; i < 4; i++)
+    s1.insert(i);
+
+  EXPECT_EQ(4u, s1.size());
+
+  for (int i = 0; i < 4; i++)
+    EXPECT_EQ(1u, s1.count(i));
+
+  EXPECT_EQ(0u, s1.count(4));
+}
+
+TEST(SmallSetTest, Grow) {
+  SmallSet<int, 4> s1;
+
+  for (int i = 0; i < 8; i++)
+    s1.insert(i);
+
+  EXPECT_EQ(8u, s1.size());
+
+  for (int i = 0; i < 8; i++)
+    EXPECT_EQ(1u, s1.count(i));
+
+  EXPECT_EQ(0u, s1.count(8));
+}
+
+TEST(SmallSetTest, Erase) {
+  SmallSet<int, 4> s1;
+
+  for (int i = 0; i < 8; i++)
+    s1.insert(i);
+
+  EXPECT_EQ(8u, s1.size());
+
+  // Remove elements one by one and check if all other elements are still there.
+  for (int i = 0; i < 8; i++) {
+    EXPECT_EQ(1u, s1.count(i));
+    EXPECT_TRUE(s1.erase(i));
+    EXPECT_EQ(0u, s1.count(i));
+    EXPECT_EQ(8u - i - 1, s1.size());
+    for (int j = i + 1; j < 8; j++)
+      EXPECT_EQ(1u, s1.count(j));
+  }
+
+  EXPECT_EQ(0u, s1.count(8));
+}