cmRange: Add unit tests

Source/cmRange.h

@@ -211,6 +211,13 @@ private:
   Iter End;
 };
 
+template <typename Iter1, typename Iter2>
+bool operator==(cmRange<Iter1> const& left, cmRange<Iter2> const& right)
+{
+  return left.size() == right.size() &&
+    std::equal(left.begin(), left.end(), right.begin());
+}
+
 template <typename Iter1, typename Iter2>
 auto cmMakeRange(Iter1 begin, Iter2 end) -> cmRange<Iter1>
 {

Tests/CMakeLib/CMakeLists.txt

@@ -7,6 +7,7 @@ include_directories(
 set(CMakeLib_TESTS
   testGeneratedFileStream.cxx
   testRST.cxx
+  testRange.cxx
   testString.cxx
   testSystemTools.cxx
   testUTF8.cxx

Tests/CMakeLib/testRange.cxx

@@ -0,0 +1,45 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+
+#include "cmRange.h"
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+#define ASSERT_TRUE(x)                                                        \
+  do {                                                                        \
+    if (!(x)) {                                                               \
+      std::cout << "ASSERT_TRUE(" #x ") failed on line " << __LINE__ << "\n"; \
+      return false;                                                           \
+    }                                                                         \
+  } while (false)
+
+int testRange(int /*unused*/, char* /*unused*/ [])
+{
+  std::vector<int> const testData = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
+
+  ASSERT_TRUE(!cmMakeRange(testData).empty());
+  ASSERT_TRUE(cmMakeRange(testData).size() == 10);
+
+  ASSERT_TRUE(!cmMakeRange(testData).advance(5).empty());
+  ASSERT_TRUE(cmMakeRange(testData).advance(5).size() == 5);
+
+  ASSERT_TRUE(cmMakeRange(testData).advance(5).retreat(5).empty());
+  ASSERT_TRUE(cmMakeRange(testData).advance(5).retreat(5).size() == 0);
+
+  ASSERT_TRUE(cmMakeRange(testData).any_of([](int n) { return n % 3 == 0; }));
+  ASSERT_TRUE(cmMakeRange(testData).all_of([](int n) { return n < 11; }));
+  ASSERT_TRUE(cmMakeRange(testData).none_of([](int n) { return n > 11; }));
+
+  std::vector<int> const evenData = { 2, 4, 6, 8, 10 };
+  ASSERT_TRUE(cmMakeRange(testData).filter([](int n) { return n % 2 == 0; }) ==
+              cmMakeRange(evenData));
+
+  std::vector<std::string> const stringRange = { "1", "2", "3", "4", "5" };
+  ASSERT_TRUE(cmMakeRange(testData)
+                .transform([](int n) { return std::to_string(n); })
+                .retreat(5) == cmMakeRange(stringRange));
+
+  return 0;
+}