(Test) Restore Exportertest::FileContentVerification test.

test/exporterTest.cpp

@@ -164,3 +164,44 @@ TEST_F(ExporterTest, print) {
 
 	ASSERT_NO_THROW(dotExporter.print()) << "File export was executed without error.";
 }
+
+TEST_F(ExporterTest, FileContentVerification) {
+	// This Test checks the content of the exported file against a golden reference.
+	File::TPGGraphDotExporter dotExporter("exported_tpg.dot", *tpg);
+
+	dotExporter.print();
+
+	std::ifstream goldenRef(TESTS_DAT_PATH "exported_tpg_ref.dot");
+	ASSERT_TRUE(goldenRef.is_open()) << "Could not open golden reference. Check project configuration.";
+
+	std::ifstream exportedFile("exported_tpg.dot");
+	ASSERT_TRUE(exportedFile) << "Could not open exported dot file.";
+
+	// Check the file content line by line
+	// print diffs in the console and count number of printed line.
+	uint64_t nbDiffs = 0;
+	uint64_t lineNumber = 0;
+	while (!exportedFile.eof() && !goldenRef.eof()) {
+		std::string lineRef;
+		std::getline(goldenRef, lineRef);
+
+		std::string lineExport;
+		std::getline(exportedFile, lineExport);
+
+		if (lineRef != lineExport) {
+			nbDiffs++;
+			std::cout << "Diff at Line " << lineNumber << ":" << std::endl;
+			std::cout << "\tref: " << lineRef << std::endl;
+			std::cout << "\texp: " << lineExport << std::endl;
+		}
+
+		lineNumber++;
+	}
+
+	if (!exportedFile.eof() || !goldenRef.eof()) {
+		nbDiffs++;
+		std::cout << "Files have different length." << std::endl;
+	}
+
+	ASSERT_EQ(nbDiffs, 0) << "Differences between reference file and exported file were detected.";
+}