move more tests

diff --git a/tests/base/task_01_exception.cc b/tests/multithreading/task_01_exception.cc
similarity index 100%
rename from tests/base/task_01_exception.cc
rename to tests/multithreading/task_01_exception.cc

diff --git a/tests/base/task_01_exception.with_threads=on.output b/tests/multithreading/task_01_exception.with_threads=on.output
similarity index 100%
rename from tests/base/task_01_exception.with_threads=on.output
rename to tests/multithreading/task_01_exception.with_threads=on.output

diff --git a/tests/base/task_01_exception_02.cc b/tests/multithreading/task_01_exception_02.cc
similarity index 100%
rename from tests/base/task_01_exception_02.cc
rename to tests/multithreading/task_01_exception_02.cc

diff --git a/tests/base/task_01_exception_02.with_threads=on.output b/tests/multithreading/task_01_exception_02.with_threads=on.output
similarity index 100%
rename from tests/base/task_01_exception_02.with_threads=on.output
rename to tests/multithreading/task_01_exception_02.with_threads=on.output