I am using ctest with test_discover_tests to unit test my applications. It appears that ctest calls my test executable for each individual test (see below for an example). I believe this results in the default.profraw code coverage file being overwritten for each test, so I only get code coverage for the last test that was executed.
As an example: ctest --verbose -R Test1|Test2
57: Test command: /home/user/project_dir/build_unit_test/project/project_test "--gtest_filter=TestUnit.Test1" "--gtest_also_run_disabled_tests"
57: Test timeout computed to be: 10000000
57: Running main() from gtest_main.cc
57: Note: Google Test filter = TestUnit.Test1
57: [==========] Running 1 test from 1 test case.
57: [----------] Global test environment set-up.
57: [----------] 1 test from TestUnit
57: [ RUN ] TestUnit.Test1
57: [ OK ] TestUnit.Test1 (6 ms)
57: [----------] 1 test from TestUnit (6 ms total)
57:
57: [----------] Global test environment tear-down
57: [==========] 1 test from 1 test case ran. (6 ms total)
57: [ PASSED ] 1 test.
9/10 Test #57: project.TestUnit.Test1 .............. Passed 0.05 sec
test 58
Start 58: project.TestUnit.Test2
58: Test command: /home/user/project_dir/build_unit_test/project/project_test "--gtest_filter=TestUnit.Test2" "--gtest_also_run_disabled_tests"
58: Test timeout computed to be: 10000000
58: Running main() from gtest_main.cc
58: Note: Google Test filter = TestUnit.Test2
58: [==========] Running 1 test from 1 test case.
58: [----------] Global test environment set-up.
58: [----------] 1 test from TestUnit
58: [ RUN ] TestUnit.Test2
58: [ OK ] TestUnit.Test2 (1 ms)
58: [----------] 1 test from TestUnit (1 ms total)
58:
58: [----------] Global test environment tear-down
58: [==========] 1 test from 1 test case ran. (2 ms total)
58: [ PASSED ] 1 test. 10/10 Test #58: project.TestUnit.Test2 .............. Passed 0.04 sec