Added to tests the file unit-algorithm.cpp (c++ 11) functions from algorithm library

[Tomerkm]

Added new tests to the file unit-algorithm.cpp (c++ 11) that were missing at the test:

1. iota
2. copy
3. copy if
4. copy n

[Describe your pull request here. Please read the text below the line, and make sure you follow the checklist.]

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Pull request checklist

Read the Contribution Guidelines for detailed information.

• [x] Changes are described in the pull request, or an existing issue is referenced.
• [x] The test suite compiles and runs without error.
• [x] Code coverage is 100%. Test cases can be added by editing the test suite.
• [x] The source code is amalgamated; that is, after making changes to the sources in the include/nlohmann directory, run make amalgamate to create the single-header files single_include/nlohmann/json.hpp and single_include/nlohmann/json_fwd.hpp. The whole process is described here.

Please don't

• The C++11 support varies between different compilers and versions. Please note the list of supported compilers. Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support. Please refrain from proposing changes that work around these compiler's limitations with #ifdefs or other means.
• Specifically, I am aware of compilation problems with Microsoft Visual Studio (there even is an issue label for this kind of bug). I understand that even in 2016, complete C++11 support isn't there yet. But please also understand that I do not want to drop features or uglify the code just to make Microsoft's sub-standard compiler happy. The past has shown that there are ways to express the functionality such that the code compiles with the most recent MSVC - unfortunately, this is not the main objective of the project.
• Please refrain from proposing changes that would break JSON conformance. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.
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[github-actions[bot]]

🔴 Amalgamation check failed! 🔴

The source code has not been amalgamated. @Tomerkm Please read and follow the Contribution Guidelines.

[coveralls]

coverage: 100.0%. remained the same when pulling ae144bae3a87a2f5ebbf99719eae7979eebb192e on Tomerkm:develop into 254395e5f7731b5595e7c11ac4b929c923582114 on nlohmann:develop.

[github-actions[bot]]

🔴 Amalgamation check failed! 🔴

The source code has not been amalgamated. @Tomerkm Please read and follow the Contribution Guidelines.

[github-actions[bot]]

🔴 Amalgamation check failed! 🔴

The source code has not been amalgamated. @Tomerkm Please read and follow the Contribution Guidelines.

[github-actions[bot]]

🔴 Amalgamation check failed! 🔴

The source code has not been amalgamated. @Tomerkm Please read and follow the Contribution Guidelines.

[nlohmann]

Please run „make amalgamate“ before committing.

[github-actions[bot]]

🔴 Amalgamation check failed! 🔴

The source code has not been amalgamated. @Tomerkm Please read and follow the Contribution Guidelines.

[Tomerkm]

hi @nlohmann, Thanks for your comment. I just saw it now.

[github-actions[bot]]

🔴 Amalgamation check failed! 🔴

The source code has not been amalgamated. @Tomerkm Please read and follow the Contribution Guidelines.

[nlohmann]

You originally added way more tests - what was wrong with them?

[Tomerkm]

You originally added way more tests - what was wrong with them?

@nlohmann you are right. Some of the tests i deleted because of the Amalgamation check failed, and some tests have failed in ubuntu but passed in windows. I add them again and see if it works

[Tomerkm]

@nlohmann Hi, I have added the tests again that i deleted before.

[nlohmann]

Thanks!