fix: Addresses the pull request comments.

- Changes the comparison to be strict rather than partial.
- Prints a list of missing plugins.
- Exists if at least one plugin is not present.
- Adds unit tests.

lib/commands/command-install.bash

@@ -71,6 +71,7 @@ install_local_tool_versions() {
   search_path=$(pwd)
 
   local some_tools_installed
+  local some_plugin_not_installed
 
   local tool_versions_path
   tool_versions_path=$(find_tool_versions)
@@ -96,12 +97,17 @@ install_local_tool_versions() {
   if [ -f "$tool_versions_path" ]; then
     tools_file=$(strip_tool_version_comments "$tool_versions_path" | cut -d ' ' -f 1)
     for plugin_name in $tools_file; do
-      if [[ ! "${plugins_installed[*]}" =~ $plugin_name ]]; then
+      if ! printf '%s\n' "${plugins_installed[@]}" | grep -P -q "^$plugin_name\$"; then
         printf "%s plugin is not installed\n" "$plugin_name"
+        some_plugin_not_installed='yes'
       fi
     done
   fi
 
+  if [ -n "$some_plugin_not_installed" ]; then
+    exit 1
+  fi
+
   if [ -n "$plugins_installed" ]; then
     for plugin_name in $plugins_installed; do
       local plugin_version_and_path

test/install_command.bats

@@ -133,6 +133,24 @@ teardown() {
   [ ! -f $ASDF_DIR/installs/dummy/1.1.0/version ]
 }
 
+@test "install_command fails if the plugin is not installed" {
+  cd $PROJECT_DIR
+  echo 'other_dummy 1.0.0' > $PROJECT_DIR/.tool-versions
+
+  run asdf install
+  [ "$status" -eq 1 ]
+  [ "$output" =  "other_dummy plugin is not installed" ]
+}
+
+@test "install_command fails if the plugin is not installed without collisions" {
+  cd $PROJECT_DIR
+  printf "dummy 1.0.0\ndum 1.0.0" > $PROJECT_DIR/.tool-versions
+
+  run asdf install
+  [ "$status" -eq 1 ]
+  [ "$output" =  "dum plugin is not installed" ]
+}
+
 @test "install_command fails when tool is specified but no version of the tool is configured in config file" {
   echo 'dummy 1.0.0' > $PROJECT_DIR/.tool-versions
   run asdf install other-dummy