add modules test

The build of package 'nodeinfo' is implicitly tested by the modules test.

.travis.yml

@@ -1,3 +1,4 @@
+dist: bionic # needed for KVM
 language: shell
 
 install:
@@ -18,7 +19,7 @@ env:
     # CACHIX_SIGNING_KEY
   - secure: "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"
   jobs:
-  - PKG=nodeinfo STABLE=1
+  - TestModules=1 STABLE=1
   - PKG=hwi STABLE=1
   - PKG=lightning-charge STABLE=1
   - PKG=lightning-charge STABLE=0
@@ -33,7 +34,21 @@ env:
   - PKG=liquid-swap STABLE=1
 script:
   - printf '%s (%s)\n' "$NIX_PATH" "$VER"
-  - time nix-instantiate -A $PKG --add-root ./drv --indirect
+  - |
+    getBuildExpr() {
+        if [[ $TestModules ]]; then
+            if [[ ! -e /dev/kvm ]]; then
+                >&2 echo "No KVM available on VM Host."
+                exit 1
+            fi
+            sudo chmod go+rw /dev/kvm
+            test/run-tests.sh exprForCI
+        else
+            echo "(import ./. {}).$PKG"
+        fi
+    }
+  - buildExpr=$(getBuildExpr)
+  - time nix-instantiate -E "$buildExpr" --add-root ./drv --indirect
   - outPath=$(nix-store --query ./drv)
   - |
     if nix path-info --store https://nix-bitcoin.cachix.org $outPath &>/dev/null; then