DEV: Move spec/components to spec/lib (#15987)

Lib specs were inexplicably split into two directories (`lib` and `components`)

This moves them all into `lib`.

spec/lib/validators/unicode_username_validator_spec.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe UnicodeUsernameValidator do
+  subject { described_class.new }
+
+  it "disallows Unicode usernames when external system avatars are disabled" do
+    SiteSetting.external_system_avatars_enabled = false
+
+    expect(subject.valid_value?("t")).to eq(false)
+    expect(subject.error_message).to eq(I18n.t("site_settings.errors.unicode_usernames_avatars"))
+
+    expect(subject.valid_value?("f")).to eq(true)
+    expect(subject.error_message).to be_blank
+  end
+
+  it "allows Unicode usernames when external system avatars are enabled" do
+    SiteSetting.external_system_avatars_enabled = true
+
+    expect(subject.valid_value?("t")).to eq(true)
+    expect(subject.error_message).to be_blank
+
+    expect(subject.valid_value?("f")).to eq(true)
+    expect(subject.error_message).to be_blank
+  end
+end