Fallback to diff_strings when assert_equal_* has no syntactic cha…

…nges

lib/quickdraw/assertions.rb

@@ -23,6 +23,7 @@ def assert_equal_sql(actual, expected)
 
 		assert(actual == expected) do
 			diff = DIFFER.diff_sql(actual, expected)
+			diff = DIFFER.diff_strings(actual, expected) if no_syntactic_changes?(diff)
 
 			"Expected SQL strings to be equal (compared with `actual == expected`):\n\n#{diff}"
 		end
@@ -35,6 +36,7 @@ def assert_equal_html(actual, expected)
 
 		assert(actual == expected) do
 			diff = DIFFER.diff_html(actual, expected)
+			diff = DIFFER.diff_strings(actual, expected) if no_syntactic_changes?(diff)
 
 			"Expected HTML strings to be equal (compared with `actual == expected`):\n\n#{diff}"
 		end
@@ -47,6 +49,7 @@ def assert_equal_ruby(actual, expected)
 
 		assert(actual == expected) do
 			diff = DIFFER.diff_ruby(actual, expected)
+			diff = DIFFER.diff_strings(actual, expected) if no_syntactic_changes?(diff)
 
 			"Expected Ruby strings to be equal (compared with `actual == expected`):\n\n#{diff}"
 		end
@@ -151,4 +154,14 @@ def refute_same(actual, expected)
 			"expected #{actual.inspect} not to be the same object as #{expected.inspect}"
 		end
 	end
+
+	private
+
+	def syntactic_changes?(diff)
+		!no_syntactic_changes?(diff)
+	end
+
+	def no_syntactic_changes?(diff)
+		diff.include?("No syntactic changes.")
+	end
 end