Increase test coverage of C code [AP-949] #1391

Job	Run time
Test Big Endian	19m 55s
Bazel	6m 33s
macOS	37m 21s
Ubuntu 18.04 (Build: Debug, Compilers: gcc-6/g++-6, Shared Library: true)	15m 46s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	14m 33s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: true)	30m 0s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	14m 21s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: false)	28m 41s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: true)	9m 3s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: true)	21m 49s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: false)	9m 51s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: false)	22m 29s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	19m 59s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	20m 21s
	4h 30m 42s

Provide feedback