enhance test framework to read meson arguments from a file per test

A 'test_args.txt' file in the same directory as the test case will be
parsed by the test framework and the content will be passed as arguments
to meson during configuration. The arguments are put before any
'extra_args' to make them overwritable from the command line.

run_tests.py

@@ -17,11 +17,13 @@
 from glob import glob
 import os, subprocess, shutil, sys, signal
 from io import StringIO
+from ast import literal_eval
 import sys
 from mesonbuild import environment
 from mesonbuild import mesonlib
 from mesonbuild import mlog
 from mesonbuild import mesonmain
+from mesonbuild.mesonlib import stringlistify
 from mesonbuild.scripts import meson_test, meson_benchmark
 import argparse
 import xml.etree.ElementTree as ET
@@ -181,6 +183,19 @@ def run_test_inprocess(testdir):
         os.chdir(old_cwd)
     return (max(returncode_test, returncode_benchmark), mystdout.getvalue(), mystderr.getvalue())
 
+def parse_test_args(testdir):
+    args = []
+    try:
+        with open(os.path.join(testdir, 'test_args.txt'), 'r') as f:
+            content = f.read()
+            try:
+                args = literal_eval(content)
+            except Exception:
+                raise Exception('Malformed test_args file.')
+            args = stringlistify(args)
+    except FileNotFoundError:
+        pass
+    return args
 
 def run_test(testdir, extra_args, should_succeed):
     global compile_commands
@@ -190,9 +205,10 @@ def run_test(testdir, extra_args, should_succeed):
     os.mkdir(test_build_dir)
     os.mkdir(install_dir)
     print('Running test: ' + testdir)
+    test_args = parse_test_args(testdir)
     gen_start = time.time()
     gen_command = [meson_command, '--prefix', '/usr', '--libdir', 'lib', testdir, test_build_dir]\
-        + unity_flags + backend_flags + extra_args
+        + unity_flags + backend_flags + test_args + extra_args
     (returncode, stdo, stde) = run_configure_inprocess(gen_command)
     gen_time = time.time() - gen_start
     if not should_succeed:

test cases/common/109 testframework options/meson.build

@@ -0,0 +1,5 @@
+project('options', 'c')
+
+assert(get_option('testoption') == 'A string with spaces', 'Incorrect value for testoption option.')
+assert(get_option('other_one') == true, 'Incorrect value for other_one option.')
+assert(get_option('combo_opt') == 'one', 'Incorrect value for combo_opt option.')

test cases/common/109 testframework options/meson_options.txt

@@ -0,0 +1,3 @@
+option('testoption', type : 'string', value : 'optval', description : 'An option to do something')
+option('other_one', type : 'boolean', value : false)
+option('combo_opt', type : 'combo', choices : ['one', 'two', 'combo'], value : 'combo')

test cases/common/109 testframework options/test_args.txt

@@ -0,0 +1,4 @@
+# This file is not read by meson itself, but by the test framework.
+# It is not possible to pass arguments to meson from a file.
+['--werror', '-D', 'testoption=A string with spaces', '-D', 'other_one=true', \
+ '-D', 'combo_opt=one']