How to run a package's testthat tests : <p>For a given installed package, how do I run its testthat tests?  I'm not a developer of the installed package, I'm a user. I just want to run its test suite to confirm its tests pass in my environment.  I've tried <code>test_check</code> and <code>test_package</code> but I see errors.</p>

<p>To be more specific,  I know its test suite fails and I want to run the tests in an interactive R session so I can debug it.</p>

<pre><code>&gt; require(eplusr)    # choice of package unimportant. Any using testthat will do.
Loading required package: eplusr
&gt; require(testthat)
Loading required package: testthat
&gt; test_check("eplusr")
Error in test_files(paths, reporter = reporter, env = env, stop_on_failure = stop_on_failure,  : 
  No matching test file in dir
&gt; test_package("eplusr")
Error: No tests found for eplusr


&gt; sessionInfo()
R version 3.5.1 (2018-07-02)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.1 LTS

Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/openblas/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/libopenblasp-r0.2.20.so

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8     LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8    LC_PAPER=en_US.UTF-8      
 [8] LC_NAME=C                  LC_ADDRESS=C               LC_TELEPHONE=C             LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] testthat_2.0.0 eplusr_0.9.1  

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.18      magrittr_1.5      units_0.6-0       hms_0.4.2         progress_1.2.0    uuid_0.1-2        bit_1.1-14        debugme_1.1.0     R6_2.2.2          rlang_0.2.2      
[11] stringr_1.3.1     blob_1.1.1        tools_3.5.1       data.table_1.11.5 cli_1.0.0         DBI_1.0.0         withr_2.1.2       bit64_0.9-7       assertthat_0.2.0  digest_0.6.16    
[21] tibble_1.4.2      crayon_1.3.4      processx_3.2.0    readr_1.1.1       callr_3.0.0       later_0.7.4       base64enc_0.1-3   ps_1.1.0          fasttime_1.0-2    memoise_1.1.0    
[31] RSQLite_2.1.1     stringi_1.2.4     pillar_1.3.0      compiler_3.5.1    prettyunits_1.0.2 lubridate_1.7.4   pkgconfig_2.0.2  
</code></pre>
