Add a test name

Change-Id: I06dfc9cad2c54ef6078342766577eab92645283f

internal/ceres/solver_impl_test.cc

diff --git a/internal/ceres/solver_impl_test.cc b/internal/ceres/solver_impl_test.cc
index 2958e84..583ef4e 100644
--- a/internal/ceres/solver_impl_test.cc
+++ b/internal/ceres/solver_impl_test.cc
@@ -1018,7 +1018,7 @@
   EXPECT_EQ(array, expected);
 }
 
-TEST(CompactifyArray, ) {
+TEST(CompactifyArray, NonContiguousRepeatingEntries) {
   vector<int> array;
   array.push_back(3);
   array.push_back(1);