Add kwarg is_default to add_test_setup()

is_default may be used to set the name of the test setup that will be
used by default whenever the option --setup is not given.

Fixes #4430

3 files changed, 11 insertions, 0 deletions

diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index 03a1f64..c0f4564 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -135,6 +135,7 @@ class Build:
         self.dep_manifest = {}
         self.cross_stdlibs = {}
         self.test_setups = {}
+        self.test_setup_default_name = None
         self.find_overrides = {}
         self.searched_programs = set() # The list of all programs that have been searched for.
 
diff --git a/mesonbuild/interpreter.py b/mesonbuild/interpreter.py
index 86b761e..df74cc0 100644
--- a/mesonbuild/interpreter.py
+++ b/mesonbuild/interpreter.py
@@ -3733,6 +3733,14 @@ different subdirectory.
         timeout_multiplier = kwargs.get('timeout_multiplier', 1)
         if not isinstance(timeout_multiplier, int):
             raise InterpreterException('Timeout multiplier must be a number.')
+        is_default = kwargs.get('is_default', False)
+        if not isinstance(is_default, bool):
+            raise InterpreterException('is_default option must be a boolean')
+        if is_default:
+            if self.build.test_setup_default_name is not None:
+                raise InterpreterException('\'%s\' is already set as default. '
+                                           'is_default can be set to true only once' % self.build.test_setup_default_name)
+            self.build.test_setup_default_name = setup_name
         env = self.unpack_env_kwarg(kwargs)
         self.build.test_setups[setup_name] = build.TestSetup(exe_wrapper=exe_wrapper,
                                                              gdb=gdb,
diff --git a/mesonbuild/mtest.py b/mesonbuild/mtest.py
index 883e556..a5a3626 100644
--- a/mesonbuild/mtest.py
+++ b/mesonbuild/mtest.py
@@ -450,6 +450,8 @@ class TestHarness:
 
     def get_test_runner(self, test):
         options = deepcopy(self.options)
+        if not options.setup:
+            options.setup = self.build_data.test_setup_default_name
         if options.setup:
             env = self.merge_suite_options(options, test)
         else: