we should throw a MultipleFailuresError when several assertions failed (checking folders or function with parameters) #29
Description
see for examples:
- https://medium.com/@BillyKorando/whats-new-in-junit-5-3-c276eb8507f1
- https://keyholesoftware.com/2018/03/12/fluent-assertions-with-assertj/
- https://github.com/ota4j-team/opentest4j/blob/master/src/test/java/org/opentest4j/MultipleFailuresErrorTests.java
- http://joel-costigliola.github.io/assertj/assertj-core-features-highlight.html#soft-assertions