nitunit: teach test_suite to compare outputs with a saved result file

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/src/testing/testing_suite.nit b/src/testing/testing_suite.nit
index ccb4710..ae1f4a2 100644 (file)
--- a/src/testing/testing_suite.nit
+++ b/src/testing/testing_suite.nit
@@ -259,6 +259,25 @@ class TestCase
                        toolcontext.warning(loc, "failure",
                           "ERROR: {method_name} (in file {test_file}.nit): {msg}")
                        toolcontext.modelbuilder.failed_tests += 1
+               else
+                       var mmodule = test_method.mclassdef.mmodule
+                       var file = mmodule.filepath
+                       if file != null then
+                               var sav = file.dirname / mmodule.name + ".sav" / test_method.name + ".res"
+                               if sav.file_exists then
+                                       toolcontext.info("Diff output with {sav}", 1)
+                                       res = toolcontext.safe_exec("diff -u --label 'expected:{sav}' --label 'got:{res_name}.out1' '{sav}' '{res_name}.out1' > '{res_name}.diff' 2>&1 </dev/null")
+                                       if res != 0 then
+                                               msg = "Diff\n" + "{res_name}.diff".to_path.read_all
+                                               error = msg
+                                               toolcontext.warning(loc, "failure",
+                                               "ERROR: {method_name} (in file {test_file}.nit): {msg}")
+                                               toolcontext.modelbuilder.failed_tests += 1
+                                       end
+                               else
+                                       toolcontext.info("No diff: {sav} not found", 2)
+                               end
+                       end
                end
                toolcontext.check_errors
        end