Resolve "Unit tests unter Windows"

Summary

100% tests passed, 0 tests failed out of 108

Related to #77 (closed) and #72 (closed)

Focus

Point the reviewer to the core of the code change. Where should they start reading? What should they focus on (e.g. security, performance, maintainability, user-friendliness, compliance with the specs, finding more corner cases, concrete questions)?

Test Environment

How to set up a test environment for manual testing?

Check List for the Author

Please, prepare your MR for a review. Be sure to write a summary and a focus and create gitlab comments for the reviewer. They should guide the reviewer through the changes, explain your changes and also point out open questions. For further good practices have a look at our review guidelines

• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
  • How do I use the software? Assume "stupid" users.
  • How do I develop or debug the software? Assume novice developers.
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

test/test_file_transmission.cpp

@@ -43,18 +43,22 @@ protected:
 TEST_F(test_file_transmission, test_file_writer_reader) {
   ASSERT_FALSE(fs::exists(test_file_name));
 
-  FileWriter writer(test_file_name);
-  std::string buffer_out(1024, 'c');
-  for (int i = 0; i < 8; i++) {
-    writer.write(buffer_out);
-    EXPECT_EQ(fs::file_size(test_file_name), 1024 * (i + 1));
+  {
+    FileWriter writer(test_file_name);
+    std::string buffer_out(1024, 'c');
+    for (int i = 0; i < 8; i++) {
+      writer.write(buffer_out);      
+    }
   }
-
-  FileReader reader(test_file_name);
-  std::string buffer_in(1024, '\0');
-  for (int i = 0; i < 8; i++) {
-    reader.read(buffer_in);
-    EXPECT_EQ(buffer_in, std::string(1024, 'c'));
+  EXPECT_EQ(fs::file_size(test_file_name), 1024 * 8);
+  
+  {
+    FileReader reader(test_file_name);
+    std::string buffer_in(1024, '\0');
+    for (int i = 0; i < 8; i++) {
+      reader.read(buffer_in);
+      EXPECT_EQ(buffer_in, std::string(1024, 'c'));
+    }
   }
 }