unittests: test external dependency in summary

This requires a bit of extra code because the version might change, but
otherwise it fits in the existing AllPlatformTests.test_summary testcase

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

test cases/unit/72 summary/meson.build

@@ -13,6 +13,7 @@ summary({'Some boolean': false,
 summary({'missing prog': find_program('xyzzy', required: false),
          'existing prog': import('python').find_installation(),
          'missing dep': dependency('', required: false),
+         'external dep': dependency('zlib', required: false),
          'internal dep': declare_dependency(),
         }, section: 'Stuff')
 summary('A number', 1, section: 'Configuration')

unittests/allplatformstests.py

@@ -3119,6 +3119,7 @@ class AllPlatformTests(BasePlatformTests):
                 missing prog   : NO
                 existing prog  : ''' + sys.executable + '''
                 missing dep    : NO
+                external dep   : YES 1.2.3
                 internal dep   : YES
 
               Plugins
@@ -3142,9 +3143,13 @@ class AllPlatformTests(BasePlatformTests):
         if sys.version_info < (3, 7, 0):
             # Dictionary order is not stable in Python <3.7, so sort the lines
             # while comparing
-            self.assertEqual(sorted(expected_lines), sorted(out_lines))
-        else:
-            self.assertEqual(expected_lines, out_lines)
+            expected_lines = sorted(expected_lines)
+            out_lines = sorted(out_lines)
+        for e, o in zip(expected_lines, out_lines):
+            if e.startswith('    external dep'):
+                self.assertRegex(o, r'^    external dep   : (YES [0-9.]*|NO)$')
+            else:
+                self.assertEqual(o, e)
 
     def test_meson_compile(self):
         """Test the meson compile command."""