Extract assert_deprecation_warning_location method

In `LooseKeywordArgumentMatchingTest` to make tests _slightly_ more
readable.

test/acceptance/loose_keyword_argument_matching_test.rb

@@ -27,10 +27,9 @@ def test_should_match_hash_parameter_with_keyword_args
       end
     end
     if Mocha::RUBY_V27_PLUS
+      assert_deprecation_warning_location(test_result, execution_point)
       assert_deprecation_warning(
-        test_result,
-        "Expectation defined at #{execution_point.location} " \
-        'expected keyword arguments (key: 42), but received positional hash ({key: 42})'
+        test_result, 'expected keyword arguments (key: 42), but received positional hash ({key: 42})'
       )
     end
     assert_passed(test_result)
@@ -47,10 +46,9 @@ def test_should_match_hash_parameter_with_splatted_keyword_args
       end
     end
     if Mocha::RUBY_V27_PLUS
+      assert_deprecation_warning_location(test_result, execution_point)
       assert_deprecation_warning(
-        test_result,
-        "Expectation defined at #{execution_point.location} " \
-        'expected keyword arguments (key: 42), but received positional hash ({key: 42})'
+        test_result, 'expected keyword arguments (key: 42), but received positional hash ({key: 42})'
       )
     end
     assert_passed(test_result)
@@ -66,10 +64,9 @@ def test_should_match_positional_and_keyword_args_with_last_positional_hash
       end
     end
     if Mocha::RUBY_V27_PLUS
+      assert_deprecation_warning_location(test_result, execution_point)
       assert_deprecation_warning(
-        test_result,
-        "Expectation defined at #{execution_point.location} " \
-        'expected positional hash ({key: 42}), but received keyword arguments (key: 42)'
+        test_result, 'expected positional hash ({key: 42}), but received keyword arguments (key: 42)'
       )
     end
     assert_passed(test_result)
@@ -85,10 +82,9 @@ def test_should_match_last_positional_hash_with_keyword_args
       end
     end
     if Mocha::RUBY_V27_PLUS
+      assert_deprecation_warning_location(test_result, execution_point)
       assert_deprecation_warning(
-        test_result,
-        "Expectation defined at #{execution_point.location} " \
-        'expected keyword arguments (key: 42), but received positional hash ({key: 42})'
+        test_result, 'expected keyword arguments (key: 42), but received positional hash ({key: 42})'
       )
     end
     assert_passed(test_result)
@@ -99,4 +95,9 @@ def test_should_match_last_positional_hash_with_keyword_args
   def assert_deprecation_warning(test_result, expected_warning)
     assert_includes test_result.last_deprecation_warning, expected_warning
   end
+
+  def assert_deprecation_warning_location(test_result, execution_point)
+    expected_location = "Expectation defined at #{execution_point.location}"
+    assert_deprecation_warning test_result, expected_location
+  end
 end