Fix a typo that made ImmutableMap::getMaxElement() useless.

Add a basic unit test for ImmutableMap. Found by inspection.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165907 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/ImmutableSet.h

@@ -89,7 +89,7 @@ public:
   ImutAVLTree* getMaxElement() {
     ImutAVLTree *T = this;
     ImutAVLTree *Right = T->getRight();
-    while (Right) { T = right; right = T->getRight(); }
+    while (Right) { T = Right; Right = T->getRight(); }
     return T;
   }
 

unittests/ADT/ImmutableMapTest.cpp

@@ -0,0 +1,50 @@
+//===----------- ImmutableMapTest.cpp - ImmutableMap unit tests ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+#include "llvm/ADT/ImmutableMap.h"
+
+using namespace llvm;
+
+namespace {
+
+TEST(ImmutableMapTest, EmptyIntMapTest) {
+  ImmutableMap<int, int>::Factory f;
+
+  EXPECT_TRUE(f.getEmptyMap() == f.getEmptyMap());
+  EXPECT_FALSE(f.getEmptyMap() != f.getEmptyMap());
+  EXPECT_TRUE(f.getEmptyMap().isEmpty());
+
+  ImmutableMap<int, int> S = f.getEmptyMap();
+  EXPECT_EQ(0u, S.getHeight());
+  EXPECT_TRUE(S.begin() == S.end());
+  EXPECT_FALSE(S.begin() != S.end());
+}
+
+TEST(ImmutableMapTest, MultiElemIntMapTest) {
+  ImmutableMap<int, int>::Factory f;
+  ImmutableMap<int, int> S = f.getEmptyMap();
+
+  ImmutableMap<int, int> S2 = f.add(f.add(f.add(S, 3, 10), 4, 11), 5, 12);
+
+  EXPECT_TRUE(S.isEmpty());
+  EXPECT_FALSE(S2.isEmpty());
+
+  EXPECT_EQ(0, S.lookup(3));
+  EXPECT_EQ(0, S.lookup(9));
+
+  EXPECT_EQ(10, *S2.lookup(3));
+  EXPECT_EQ(11, *S2.lookup(4));
+  EXPECT_EQ(12, *S2.lookup(5));
+
+  EXPECT_EQ(5, S2.getMaxElement()->first);
+  EXPECT_EQ(3U, S2.getHeight());
+}
+
+}