Add a test case for location in duplicate kwarg warning

run_unittests.py

@@ -1707,6 +1707,12 @@ int main(int argc, char **argv) {
         self.init(workdir)
         self.build()
 
+    def test_warning_location(self):
+        tdir = os.path.join(self.unit_test_dir, '20 warning location')
+        out = self.init(tdir)
+        self.assertRegex(out, r'WARNING: Keyword argument "link_with" defined multiple times in file meson.build, line 4')
+        self.assertRegex(out, r'WARNING: Keyword argument "link_with" defined multiple times in file sub' + re.escape(os.path.sep) + r'meson.build, line 3')
+
 
 class FailureTests(BasePlatformTests):
     '''

test cases/unit/20 warning location/meson.build

@@ -0,0 +1,5 @@
+project('duplicate kwarg', 'c')
+a = library('liba', 'a.c')
+b = library('libb', 'b.c')
+executable('main', 'main.c', link_with: a, link_with: b)
+subdir('sub')

test cases/unit/20 warning location/sub/meson.build

@@ -0,0 +1,3 @@
+c = library('libc', 'c.c')
+d = library('libd', 'd.c')
+executable('sub', 'sub.c', link_with: c, link_with: d)