added package testing

.github/workflows/check.yml

@@ -28,4 +28,4 @@ jobs:
         extraPullNames: rstats-on-nix, nix-community
     - run: nix build .
     - run: nix flake check . --all-systems
-    - run: nix develop -c "R -e 'library(httpgd)'"
+    - run: nix develop -c Rscript test/test.R

test/test.R

@@ -0,0 +1,14 @@
+library(httpgd)
+hgd()
+
+library(musicMetadata)
+print(classify_labels('Interscope'))
+
+library(nvimcom)
+
+library(synthdid)
+data('california_prop99')
+setup = panel.matrices(california_prop99)
+tau.hat = synthdid_estimate(setup$Y, setup$N0, setup$T0)
+se = sqrt(vcov(tau.hat, method='placebo'))
+sprintf('95%% CI (%1.2f, %1.2f)', tau.hat - 1.96 * se, tau.hat + 1.96 * se)