Add tests

[hongyuanjia]

Pull request overview

• Fixes Use GitHub Actions with cache to run full tests #21
• Besides adding tests, some minor bugs have been fixed also:
  • Fix the error in summary_database() when no NetCDF files are found in the input directory.
  • Fix the error about overwriting temporary EPW file when epw in match_coord() is a search string.
  • Now morphing_epw() can correctly fall back to use "Shift" method when any missing values are detected in maximum and minimum prediction values of climate variables.
  • Fix the wrong warning messages when combined method is used in morphing_epw().

[codecov-commenter]

Codecov Report

Merging #25 (b628731) into master (86f058a) will increase coverage by 83.33%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master      #25       +/-   ##
===========================================
+ Coverage   16.47%   99.81%   +83.33%     
===========================================
  Files           6        5        -1     
  Lines        1129     1063       -66     
===========================================
+ Hits          186     1061      +875     
+ Misses        943        2      -941     

Impacted Files	Coverage Δ
R/coord.R	100.00% <100.00%> (+100.00%)	⬆️
R/esgf.R	100.00% <100.00%> (+37.26%)	⬆️
R/morph.R	100.00% <100.00%> (+100.00%)	⬆️
R/netcdf.R	99.33% <100.00%> (+99.33%)	⬆️
R/utils.R	100.00% <100.00%> (+5.88%)	⬆️
R/epwshiftr-package.R
... and 1 more

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