Fix gems constraints detection failures

Fix gems constraints detection failures when similar version constraint ( ~> )
is used as second constraint by extending the regex.

/reviewed-by @kirr
/reviewed-on nexedi/rubygemsrecipe!6

rubygems.py

@@ -50,7 +50,7 @@ class Recipe(object):
         deployment = options.get('deployment')
         self.deployment = is_true(deployment) if deployment else not allow_picked_versions()
         self.gem_regex = re.compile(r'\s+([\w\-_.]+) \((<|~>|>=) '
-                                    r'((\d+\.)*\d+)(, (>=) ((\d+\.)*\d+))?\)')
+                                    r'((\d+\.)*\d+)(, (<|~>|>=) ((\d+\.)*\d+))?\)')
 
     def run(self, cmd, environ=None):
         """Run the given ``cmd`` in a child process."""

tests/test_data/dependency_cucumber-gherkin-15.0.0.txt

+Gem cucumber-gherkin-15.0.0
+  cucumber-messages (>= 13.0.1, ~> 13.0)
+  rake (>= 13.0.1, ~> 13.0, development)
+  rspec (>= 3.9.0, ~> 3.9, development)
+

tests/test_rubygems.py

@@ -444,3 +444,31 @@ class RubyGemsDeploymentTestCase(RubyGemsTestCase):
     def test_deployment_subdependency_constraint_success(
             self, path, patches, buildout, name, options):
         self.deployment_install_test(buildout, name, path, patches, options)
+
+    @deployment_fixture({'recipe': {
+        'gems': 'activesupport==3.2.0 atomic==0.0.1 cucumber-core==7.1.0 '
+                'cucumber-messages==12.3.2 cucumber-gherkin==15.0.0 '
+                'cucumber-tag-expressions==2.0.4 i18n==0.6.0 middleware==0.1.0 '
+                'multi_json==1.0.0 protobuf-cucumber==3.10.8 thor==0.9.2 '
+                'thread_safe==0.1.0'
+    }})
+    def test_deployment_similar_second_constraint_error(
+            self, path, patches, buildout, name, options):
+        recipe = rubygems.Recipe(buildout, name, options)
+        self.assertRaisesRegexp(
+            zc.buildout.UserError,
+            'Configuration error, version 15.0.0 for gem cucumber-gherkin '
+            'does not satisfy dependency constraint < 15 of gem cucumber-core',
+            recipe.install
+        )
+
+    @deployment_fixture({'recipe': {
+        'gems': 'activesupport==3.2.0 atomic==0.0.1 cucumber-core==7.1.0 '
+                'cucumber-messages==12.3.2 cucumber-gherkin==14.1.0 '
+                'cucumber-tag-expressions==2.0.4 i18n==0.6.0 middleware==0.1.0 '
+                'multi_json==1.0.0 protobuf-cucumber==3.10.8 thor==0.9.2 '
+                'thread_safe==0.1.0'
+    }})
+    def test_deployment_similar_second_constraint_success(
+            self, path, patches, buildout, name, options):
+        self.deployment_install_test(buildout, name, path, patches, options)