diff --git a/test/lib/helpers.bats b/test/lib/helpers.bats
index 4f3e4ffa..3faddc6b 100644
--- a/test/lib/helpers.bats
+++ b/test/lib/helpers.bats
@@ -1,5 +1,6 @@
 #!/usr/bin/env bats
 
+load ../test_helper
 load ../../lib/composure
 load ../../plugins/available/base.plugin
 
@@ -7,4 +8,101 @@ cite _about _param _example _group _author _version
 
 load ../../lib/helpers
 
-## TODO: write some tests.
+function __setup_plugin_tests {
+  mkdir -p $BASH_IT/plugins
+  cp -r ../plugins/available $BASH_IT/plugins
+  mkdir -p $BASH_IT/plugins/enabled
+}
+
+@test "enable the node plugin" {
+  __setup_plugin_tests
+
+  run _enable-plugin "node"
+  [ "${lines[0]}" == 'node enabled with priority 250.' ]
+  [ -L "$BASH_IT/plugins/enabled/250---node.plugin.bash" ]
+}
+
+@test "enable the nvm plugin" {
+  __setup_plugin_tests
+
+  run _enable-plugin "nvm"
+  [ "${lines[0]}" == 'nvm enabled with priority 225.' ]
+  [ -L "$BASH_IT/plugins/enabled/225---nvm.plugin.bash" ]
+}
+
+@test "enable an unknown plugin" {
+  __setup_plugin_tests
+
+  run _enable-plugin "unknown-foo"
+  [ "${lines[0]}" == 'sorry, unknown-foo does not appear to be an available plugin.' ]
+  [ ! -L "$BASH_IT/plugins/enabled/250---unknown-foo.plugin.bash" ]
+  [ ! -L "$BASH_IT/plugins/enabled/unknown-foo.plugin.bash" ]
+}
+
+@test "disable a plugin that is not enabled" {
+  __setup_plugin_tests
+
+  run _disable-plugin "sdkman"
+  [ "${lines[0]}" == 'sorry, sdkman does not appear to be an enabled plugin.' ]
+}
+
+@test "enable and disable the nvm plugin" {
+  __setup_plugin_tests
+
+  run _enable-plugin "nvm"
+  [ "${lines[0]}" == 'nvm enabled with priority 225.' ]
+  [ -L "$BASH_IT/plugins/enabled/225---nvm.plugin.bash" ]
+
+  run _disable-plugin "nvm"
+  [ "${lines[0]}" == 'nvm disabled.' ]
+  [ ! -L "$BASH_IT/plugins/enabled/225---nvm.plugin.bash" ]
+}
+
+@test "disable the nvm plugin if it was enabled without a priority" {
+  __setup_plugin_tests
+
+  ln -s $BASH_IT/plugins/available/nvm.plugin.bash $BASH_IT/plugins/enabled/nvm.plugin.bash
+  [ -L "$BASH_IT/plugins/enabled/nvm.plugin.bash" ]
+
+  run _disable-plugin "nvm"
+  [ "${lines[0]}" == 'nvm disabled.' ]
+  [ ! -L "$BASH_IT/plugins/enabled/nvm.plugin.bash" ]
+}
+
+@test "enable the nvm plugin twice" {
+  __setup_plugin_tests
+
+  run _enable-plugin "nvm"
+  [ "${lines[0]}" == 'nvm enabled with priority 225.' ]
+  [ -L "$BASH_IT/plugins/enabled/225---nvm.plugin.bash" ]
+
+  run _enable-plugin "nvm"
+  [ "${lines[0]}" == 'nvm is already enabled.' ]
+  [ -L "$BASH_IT/plugins/enabled/225---nvm.plugin.bash" ]
+}
+
+@test "enable all plugins" {
+  __setup_plugin_tests
+
+  run _enable-plugin "all"
+  local available=$(find $BASH_IT/plugins/available -name *.plugin.bash | wc -l)
+  local enabled=$(find $BASH_IT/plugins/enabled -name 2*.plugin.bash | wc -l)
+  echo "Available: $available, Enabled: $enabled"
+  [ "$available" == "$enabled" ]
+}
+
+@test "describe the nvm plugin without enabling it" {
+  __setup_plugin_tests
+
+  _bash-it-describe "plugins" "a" "plugin" "Plugin" | grep "nvm" | grep "\[ \]"
+}
+
+@test "describe the nvm plugin after enabling it" {
+  __setup_plugin_tests
+
+  run _enable-plugin "nvm"
+  [ "${lines[0]}" == 'nvm enabled with priority 225.' ]
+  [ -L "$BASH_IT/plugins/enabled/225---nvm.plugin.bash" ]
+
+  _bash-it-describe "plugins" "a" "plugin" "Plugin" | grep "nvm" | grep "\[x\]"
+}