test: improve functional tests (#26)

.github/workflows/checks.yml

@@ -36,6 +36,6 @@ jobs:
       - name: Run functional tests
         shell: sh
         run: |
-          echo $PATH
+          echo $PATH # $GOBIN is already added to $PATH by setup-go.
           chmod +x test.sh
           ./test.sh ${{ matrix.os }}

test.sh

@@ -8,13 +8,27 @@ if [ "$os" = "windows-latest" ]; then
     exe=".exe"
 fi
 
-version="1.18"
+dump_version() {
+    file="$1"
+    hash -r # refresh binary paths
+    go version | awk '{print $3}' > "$file"
+}
+
 go build -o goversion"$exe"
+
+version="1.18"
+echo "go$version" > want
+dump_version main
+
 echo "Switching to $version"
 ./goversion"$exe" use "$version"
+dump_version got
+diff got want
+
 echo "Installed versions"
 ./goversion"$exe" ls
-hash -r # refresh binary paths
-go version | awk '{print $3}' > got
-echo "go$version" > want
-diff got want
+
+echo "Removing $version"
+./goversion"$exe" rm "$version"
+dump_version got
+diff got main