run_unittests: use textwrap.dedent

So that editors that can fold code (vim, vscode, etc) can correctly fold
functions, instead of getting confused by code that doesn't follow the
current indention. Also, it makes the code easier to read.

mesonbuild/build.py

@@ -1359,11 +1359,12 @@ You probably should put it in link_with instead.''')
         for link_target in self.link_targets:
             if isinstance(link_target, SharedModule):
                 if self.environment.machines[self.for_machine].is_darwin():
-                    raise MesonException('''target links against shared modules.
-This is not permitted on OSX''')
+                    raise MesonException(
+                        'target links against shared modules. This is not permitted on OSX')
                 else:
-                    mlog.warning('''target links against shared modules. This is not
-recommended as it is not supported on some platforms''')
+                    mlog.warning('target links against shared modules. This '
+                                 'is not recommended as it is not supported on some '
+                                 'platforms')
                 return
 
 class Generator:

run_unittests.py

@@ -2942,20 +2942,22 @@ class AllPlatformTests(BasePlatformTests):
         # the source tree leads to all kinds of trouble.
         with tempfile.TemporaryDirectory() as project_dir:
             with open(os.path.join(project_dir, 'meson.build'), 'w') as ofile:
-                ofile.write('''project('disttest', 'c', version : '1.4.3')
-e = executable('distexe', 'distexe.c')
-test('dist test', e)
-subproject('vcssub', required : false)
-subproject('tarballsub', required : false)
-''')
+                ofile.write(textwrap.dedent('''\
+                    project('disttest', 'c', version : '1.4.3')
+                    e = executable('distexe', 'distexe.c')
+                    test('dist test', e)
+                    subproject('vcssub', required : false)
+                    subproject('tarballsub', required : false)
+                    '''))
             with open(os.path.join(project_dir, 'distexe.c'), 'w') as ofile:
-                ofile.write('''#include<stdio.h>
+                ofile.write(textwrap.dedent('''\
+                    #include<stdio.h>
 
-int main(int argc, char **argv) {
+                    int main(int argc, char **argv) {
                         printf("I am a distribution test.\\n");
                         return 0;
-}
-''')
+                    }
+                    '''))
             xz_distfile = os.path.join(self.distdir, 'disttest-1.4.3.tar.xz')
             xz_checksumfile = xz_distfile + '.sha256sum'
             zip_distfile = os.path.join(self.distdir, 'disttest-1.4.3.zip')
@@ -3614,8 +3616,8 @@ int main(int argc, char **argv) {
         """
         tdir = os.path.join(self.unit_test_dir, '30 shared_mod linking')
         out = self.init(tdir)
-        msg = ('''WARNING: target links against shared modules. This is not
-recommended as it is not supported on some platforms''')
+        msg = ('WARNING: target links against shared modules. This is not '
+               'recommended as it is not supported on some platforms')
         self.assertIn(msg, out)
 
     def test_ndebug_if_release_disabled(self):
@@ -7264,16 +7266,18 @@ class LinuxlikeTests(BasePlatformTests):
         testdir = os.path.join(self.unit_test_dir, '61 identity cross')
 
         nativefile = tempfile.NamedTemporaryFile(mode='w')
-        nativefile.write('''[binaries]
-c = ['{0}']
-'''.format(os.path.join(testdir, 'build_wrapper.py')))
+        nativefile.write(textwrap.dedent('''\
+            [binaries]
+            c = ['{0}']
+            '''.format(os.path.join(testdir, 'build_wrapper.py'))))
         nativefile.flush()
         self.meson_native_file = nativefile.name
 
         crossfile = tempfile.NamedTemporaryFile(mode='w')
-        crossfile.write('''[binaries]
-c = ['{0}']
-'''.format(os.path.join(testdir, 'host_wrapper.py')))
+        crossfile.write(textwrap.dedent('''\
+            [binaries]
+            c = ['{0}']
+            '''.format(os.path.join(testdir, 'host_wrapper.py'))))
         crossfile.flush()
         self.meson_cross_file = crossfile.name
 
@@ -7286,9 +7290,10 @@ c = ['{0}']
             'CC_FOR_BUILD': '"' + os.path.join(testdir, 'build_wrapper.py') + '"',
         }
         crossfile = tempfile.NamedTemporaryFile(mode='w')
-        crossfile.write('''[binaries]
-c = ['{0}']
-'''.format(os.path.join(testdir, 'host_wrapper.py')))
+        crossfile.write(textwrap.dedent('''\
+            [binaries]
+            c = ['{0}']
+            '''.format(os.path.join(testdir, 'host_wrapper.py'))))
         crossfile.flush()
         self.meson_cross_file = crossfile.name
         # TODO should someday be explicit about build platform only here

test cases/failing/76 link with shared module on osx/test.json

@@ -1,7 +1,7 @@
 {
   "stdout": [
     {
-      "line": "test cases/failing/76 link with shared module on osx/meson.build:8:0: ERROR: target links against shared modules."
+      "line": "test cases/failing/76 link with shared module on osx/meson.build:8:0: ERROR: target links against shared modules. This is not permitted on OSX"
     }
   ]
 }