[BUG] 2.6.2: no cmake test suite with PYBIND11_TEST:BOOL=ON

Looks like something is not finished.

+ cd pybind11-2.6.2
+ /usr/bin/make -O -j48 V=1 VERBOSE=1 -C x86_64-redhat-linux-gnu test ARGS=--output-on-failure
make: *** No rule to make target 'test'.  Stop.

[tkloczko@barrel x86_64-redhat-linux-gnu]$ cmake -L
CMake Warning:
  No source or binary directory provided.  Both will be assumed to be the
  same as the current working directory, but note that this warning will
  become a fatal error in future CMake releases.


CMake Error: The source directory "/home/tkloczko/rpmbuild/BUILD/pybind11-2.6.2/x86_64-redhat-linux-gnu" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
-- Cache values
CATCH_INCLUDE_DIR:PATH=/usr/include/catch2
CMAKE_BUILD_TYPE:STRING=RelWithDebInfo
CMAKE_INSTALL_PREFIX:PATH=/usr
DOWNLOAD_EIGEN:BOOL=OFF
Eigen3_DIR:PATH=/usr/share/eigen3
PYBIND11_CMAKECONFIG_INSTALL_DIR:STRING=share/cmake/pybind11
PYBIND11_CUDA_TESTS:BOOL=OFF
PYBIND11_FINDPYTHON:BOOL=OFF
PYBIND11_INSTALL:BOOL=ON
PYBIND11_NOPYTHON:BOOL=OFF
PYBIND11_PYTHON_VERSION:STRING=
PYBIND11_TEST:BOOL=ON
PYBIND11_TEST_FILTER:STRING=
PYBIND11_TEST_OVERRIDE:STRING=
PYBIND11_TEST_PREFIX_COMMAND:STRING=
PYBIND11_WERROR:BOOL=OFF
USE_PYTHON_INCLUDE_DIR:BOOL=OFF

Start by inspecting the repository's CMakeLists.txt and the configuration for PYBIND11_TEST=ON, then reproduce the reported build with CMake and make test. Done means the configured build provides a test target and the test command runs successfully with the shown options.