Add tests for user creation/deletion/retrieval

Summary

Tests for caosdb-cpplib!40 (merged)

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)
• 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)
• 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.

.docker/Dockerfile

@@ -7,7 +7,7 @@ COPY .docker/wait-for-it.sh /wait-for-it.sh
 WORKDIR /libcaosdb/
 RUN mkdir build
 WORKDIR /libcaosdb/build
-RUN conan create -s "compiler.libcxx=libstdc++11" -o caosdb:build_acm=True .. "caosdb/$(conan inspect --raw version ..)"
+RUN conan create -s "compiler.libcxx=libstdc++11" -o caosdb:build_acm=True .. "caosdb/$(conan inspect --raw version ..)@_/_"
 
 COPY . /caosdb-cppinttest
 WORKDIR /caosdb-cppinttest