tidy up CMake files

CMakeLists.txt

 cmake_minimum_required(VERSION 3.15)
-project(EvalHyd LANGUAGES CXX VERSION 0.0.1 DESCRIPTION "Utility to evaluate streamflow predictions")
+
+project(
+        EvalHyd
+        LANGUAGES CXX
+        VERSION 0.0.1
+        DESCRIPTION "Utility to evaluate streamflow predictions"
+)
+
+# ------------------------------------------------------------------------------
+# dependencies
+# ------------------------------------------------------------------------------
+
+find_package(xtensor REQUIRED)
+message(STATUS "Found xtensor: ${xtensor_INCLUDE_DIRS}/xtensor")
+
+# ------------------------------------------------------------------------------
+# build
+# ------------------------------------------------------------------------------
 
 # define evalhyd library
 add_library(
@@ -22,8 +39,6 @@ target_include_directories(
                 ${CMAKE_CURRENT_SOURCE_DIR}/src
 )
 
-find_package(xtensor REQUIRED)
-
 target_link_libraries(
         evalhyd
         PUBLIC
@@ -36,9 +51,15 @@ target_compile_features(
                 cxx_std_14
 )
 
-# testing
+# test suite
 OPTION(EVALHYD_BUILD_TEST "configure and compile tests" ON)
 
 if(EVALHYD_BUILD_TEST)
     add_subdirectory(tests)
 endif()
+
+# ------------------------------------------------------------------------------
+# installation
+# ------------------------------------------------------------------------------
+
+# TODO

tests/CMakeLists.txt

 cmake_minimum_required(VERSION 3.15)
 
-# TEST SUITE -------------------------------------------------------------------
+# ------------------------------------------------------------------------------
+# dependencies
+# ------------------------------------------------------------------------------
+find_package(GTest REQUIRED)
+
+# ------------------------------------------------------------------------------
+# build
+# ------------------------------------------------------------------------------
 add_executable(
         evalhyd_tests
         test_determinist.cpp
@@ -17,11 +24,9 @@ target_include_directories(
 target_compile_definitions(
         evalhyd_tests
         PRIVATE
-            EVALHYD_DATA_DIR="${CMAKE_CURRENT_SOURCE_DIR}/data"
+                EVALHYD_DATA_DIR="${CMAKE_CURRENT_SOURCE_DIR}/data"
 )
 
-find_package(GTest REQUIRED)
-
 target_link_libraries(
         evalhyd_tests
         PRIVATE