test: increase code coverage in blas/base/zaxpy

[ShabiShett07]

none

Description

What is the purpose of this pull request?

This pull request:

• adds test cases for blas/base/caxpy which had an incomplete coverage report.

Related Issues

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This pull request:

• none

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Coverage Report

Package	Statements	Branches	Functions	Lines
blas/base/dsyr	$\color{green}549/549$ $\color{green}+100.00\%$	$\color{green}52/52$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}549/549$ $\color{green}+100.00\%$
blas/base/zaxpy	$\color{green}258/258$ $\color{green}+100.00\%$	$\color{green}13/13$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}258/258$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.