Add test priorities to force test start order

3 files changed, 15 insertions, 6 deletions

diff --git a/mesonbuild/backend/backends.py b/mesonbuild/backend/backends.py
index 512eeed..c0b2666 100644
--- a/mesonbuild/backend/backends.py
+++ b/mesonbuild/backend/backends.py
@@ -86,7 +86,7 @@ class TestSerialisation:
                  is_parallel: bool, cmd_args: typing.List[str],
                  env: build.EnvironmentVariables, should_fail: bool,
                  timeout: typing.Optional[int], workdir: typing.Optional[str],
-                 extra_paths: typing.List[str], protocol: str):
+                 extra_paths: typing.List[str], protocol: str, priority: int):
         self.name = name
         self.project_name = project
         self.suite = suite
@@ -103,6 +103,7 @@ class TestSerialisation:
         self.workdir = workdir
         self.extra_paths = extra_paths
         self.protocol = protocol
+        self.priority = priority
 
 class OptionProxy:
     def __init__(self, value):
@@ -728,7 +729,7 @@ class Backend:
 
     def create_test_serialisation(self, tests):
         arr = []
-        for t in tests:
+        for t in sorted(tests, key=lambda tst: -1 * tst.priority):
             exe = t.get_exe()
             if isinstance(exe, dependencies.ExternalProgram):
                 cmd = exe.get_command()
@@ -770,7 +771,8 @@ class Backend:
                     raise MesonException('Bad object in test command.')
             ts = TestSerialisation(t.get_name(), t.project_name, t.suite, cmd, is_cross,
                                    exe_wrapper, t.is_parallel, cmd_args, t.env,
-                                   t.should_fail, t.timeout, t.workdir, extra_paths, t.protocol)
+                                   t.should_fail, t.timeout, t.workdir,
+                                   extra_paths, t.protocol, t.priority)
             arr.append(ts)
         return arr
 
diff --git a/mesonbuild/interpreter.py b/mesonbuild/interpreter.py
index 5f69e22..03910b2 100644
--- a/mesonbuild/interpreter.py
+++ b/mesonbuild/interpreter.py
@@ -900,7 +900,8 @@ class Test(InterpreterObject):
     def __init__(self, name: str, project: str, suite: List[str], exe: build.Executable,
                  depends: List[Union[build.CustomTarget, build.BuildTarget]],
                  is_parallel: bool, cmd_args: List[str], env: build.EnvironmentVariables,
-                 should_fail: bool, timeout: int, workdir: Optional[str], protocol: str):
+                 should_fail: bool, timeout: int, workdir: Optional[str], protocol: str,
+                 priority: int):
         InterpreterObject.__init__(self)
         self.name = name
         self.suite = suite
@@ -914,6 +915,7 @@ class Test(InterpreterObject):
         self.timeout = timeout
         self.workdir = workdir
         self.protocol = protocol
+        self.priority = priority
 
     def get_exe(self):
         return self.exe
@@ -2044,7 +2046,7 @@ permitted_kwargs = {'add_global_arguments': {'language', 'native'},
                     'subdir': {'if_found'},
                     'subproject': {'version', 'default_options', 'required'},
                     'test': {'args', 'depends', 'env', 'is_parallel', 'should_fail', 'timeout', 'workdir',
-                             'suite', 'protocol'},
+                             'suite', 'protocol', 'priority'},
                     'vcs_tag': {'input', 'output', 'fallback', 'command', 'replace_string'},
                     }
 
@@ -3383,6 +3385,7 @@ This will become a hard error in the future.''' % kwargs['input'], location=self
         self.add_test(node, args, kwargs, False)
 
     @FeatureNewKwargs('test', '0.46.0', ['depends'])
+    @FeatureNewKwargs('test', '0.52.0', ['priority'])
     @permittedKwargs(permitted_kwargs['test'])
     def func_test(self, node, args, kwargs):
         self.add_test(node, args, kwargs, True)
@@ -3453,8 +3456,11 @@ This will become a hard error in the future.''' % kwargs['input'], location=self
         for dep in depends:
             if not isinstance(dep, (build.CustomTarget, build.BuildTarget)):
                 raise InterpreterException('Depends items must be build targets.')
+        priority = kwargs.get('priority', 0)
+        if not isinstance(priority, int):
+            raise InterpreterException('Keyword argument priority must be an integer.')
         t = Test(args[0], prj, suite, exe.held_object, depends, par, cmd_args,
-                 env, should_fail, timeout, workdir, protocol)
+                 env, should_fail, timeout, workdir, protocol, priority)
         if is_base_test:
             self.build.tests.append(t)
             mlog.debug('Adding test', mlog.bold(args[0], True))
diff --git a/mesonbuild/mintro.py b/mesonbuild/mintro.py
index 1d30149..49eef0a 100644
--- a/mesonbuild/mintro.py
+++ b/mesonbuild/mintro.py
@@ -321,6 +321,7 @@ def get_test_list(testdata):
         to['timeout'] = t.timeout
         to['suite'] = t.suite
         to['is_parallel'] = t.is_parallel
+        to['priority'] = t.priority
         result.append(to)
     return result