diff --git a/.rubocop.yml b/.rubocop.yml
index 8826647..dfb6d83 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -14,4 +14,14 @@ Layout/LineLength:
   Max: 120
 
 Naming/FileName:
-  Enabled: false
\ No newline at end of file
+  Enabled: false
+
+Metrics/AbcSize:
+  Enabled: false
+
+Metrics/MethodLength: 
+  Max: 20
+
+Metrics/BlockLength:
+  Exclude:
+    - spec/*.rb
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index add520a..fd5d5a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,9 @@
-## [Unreleased]
+# Changelog
+
+## [0.1.1] - 2024-06-07
+
+- add conditional view of donation crypto currences
+- cover with tests
 
 ## [0.1.0] - 2024-06-06
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 7e6bcb3..8120398 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    jekyll-crypto-donations (0.1.0)
+    jekyll-crypto-donations (0.1.1)
       jekyll (~> 4.3)
 
 GEM
@@ -101,6 +101,8 @@ GEM
     sass-embedded (1.58.3)
       google-protobuf (~> 3.21)
       rake (>= 10.0.0)
+    sass-embedded (1.58.3-x86_64-darwin)
+      google-protobuf (~> 3.21)
     strscan (3.1.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
diff --git a/lib/jekyll-crypto-donations.rb b/lib/jekyll-crypto-donations.rb
index 622a573..a0bf2c5 100644
--- a/lib/jekyll-crypto-donations.rb
+++ b/lib/jekyll-crypto-donations.rb
@@ -8,57 +8,127 @@ module Jekyll
   module CryptoDonations
     # describe {% crypto_donations %} tag content
     class DonationsTag < Liquid::Tag
+      attr_reader :btc_address, :eth_address, :usdt_address
+
       def initialize(tag_name, text, tokens)
         super
         @text = text
       end
 
-      def render(context)
+      def btc_html
+        return "" unless btc_address
+
+        <<~HTML
+          <div>
+            <h3>Bitcoin (BTC)</h3>
+            <p>Address: #{btc_address}</p>
+            <p id="btc-donations">Loading...</p>
+          </div>
+        HTML
+      end
+
+      def eth_html
+        return "" unless eth_address
+
+        <<~HTML
+          <div>
+            <h3>Ethereum (ETH)</h3>
+            <p>Address: #{eth_address}</p>
+            <p id="eth-donations">Loading...</p>
+          </div>
+        HTML
+      end
+
+      def usdt_html
+        return "" unless usdt_address
+
+        <<~HTML
+          <div>
+            <h3>USDT (TRC-20)</h3>
+            <p>Address: #{usdt_address}</p>
+            <p id="usdt-donations">Loading...</p>
+          </div>
+        HTML
+      end
+
+      def btc_js
+        return "" unless btc_address
+
+        <<~JS
+          const btcDonations = await getDonations('btc', '#{btc_address}');
+          document.getElementById('btc-donations').innerText = `Total received: ${btcDonations} BTC`;
+        JS
+      end
+
+      def eth_js
+        return "" unless eth_address
+
+        <<~JS
+          const ethDonations = await getDonations('eth', '#{eth_address}');
+          document.getElementById('eth-donations').innerText = `Total received: ${ethDonations} ETH`;
+        JS
+      end
+
+      def usdt_js
+        return "" unless usdt_address
+
+        <<~JS
+          const usdtDonations = await getDonations('usdt', '#{usdt_address}');
+          document.getElementById('usdt-donations').innerText = `Total received: ${usdtDonations} USDT`;
+        JS
+      end
+
+      def site_config(context)
         site_config = context.registers.fetch(:site).config
-        btc_address = site_config.dig("crypto_donations", "btc_address")
-        eth_address = site_config.dig("crypto_donations", "eth_address")
-        usdt_address = site_config.dig("crypto_donations", "usdt_address")
+        @btc_address = site_config.dig("crypto_donations", "btc_address")
+        @eth_address = site_config.dig("crypto_donations", "eth_address")
+        @usdt_address = site_config.dig("crypto_donations", "usdt_address")
+      end
 
+      def opening_html
         <<~HTML
           <div id="crypto-donations">
             <h2>Support Us with Crypto Donations</h2>
             <p>#{@text}</p>
-            <div>
-              <h3>Bitcoin (BTC)</h3>
-              <p id="btc-address">#{btc_address}</p>
-              <p id="btc-donations">Loading...</p>
-            </div>
-            <div>
-              <h3>Ethereum (ETH)</h3>
-              <p id="eth-address">#{eth_address}</p>
-              <p id="eth-donations">Loading...</p>
-            </div>
-            <div>
-              <h3>USDT (TRC-20)</h3>
-              <p id="usdt-address">Address: #{usdt_address}</p>
-              <p id="usdt-donations">Loading...</p>
-            </div>
+        HTML
+      end
+
+      def closing_html
+        <<~HTML
           </div>
           <script type="module">
             import { getDonations } from '/assets/js/crypto-donations/crypto-donations.js';
 
             document.addEventListener('DOMContentLoaded', async () => {
-              const btcAddress = '#{btc_address}';
-              const ethAddress = '#{eth_address}';
-              const usdtAddress = '#{usdt_address}'
+        HTML
+      end
 
-              const usdtDonations = await getDonations('usdt', usdtAddress);
-              document.getElementById('usdt-donations').innerText = `Total received: ${usdtDonations} USDT`;
+      def closing_js
+        <<~JS
+            });
+          </script>
+        JS
+      end
 
-              const btcDonations = await getDonations('btc', btcAddress);
-              document.getElementById('btc-donations').innerText = `Total received: ${btcDonations} BTC`;
+      def render(context)
+        site_config(context)
+        return if btc_address.nil? && eth_address.nil? && usdt_address.nil?
 
-              const ethDonations = await getDonations('eth', ethAddress);
-              document.getElementById('eth-donations').innerText = `Total received: ${ethDonations} ETH`;
+        content = opening_html
 
-            });
-          </script>
-        HTML
+        content += btc_html
+        content += eth_html
+        content += usdt_html
+
+        content += closing_html
+
+        content += btc_js
+        content += eth_js
+        content += usdt_js
+
+        content += closing_js
+
+        content
       end
     end
   end
diff --git a/lib/jekyll-crypto-donations/version.rb b/lib/jekyll-crypto-donations/version.rb
index 549bf11..03ded8d 100644
--- a/lib/jekyll-crypto-donations/version.rb
+++ b/lib/jekyll-crypto-donations/version.rb
@@ -2,6 +2,6 @@
 
 module Jekyll
   module CryptoDonations
-    VERSION = "0.1.0"
+    VERSION = "0.1.1"
   end
 end
diff --git a/spec/jekyll_crypto_donations_spec.rb b/spec/jekyll_crypto_donations_spec.rb
new file mode 100644
index 0000000..474d62c
--- /dev/null
+++ b/spec/jekyll_crypto_donations_spec.rb
@@ -0,0 +1,85 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+RSpec.describe Jekyll::CryptoDonations::DonationsTag do
+  let(:site_config) do
+    {
+      "btc_address" => "btc_test_address",
+      "eth_address" => "eth_test_address",
+      "usdt_address" => "usdt_test_address"
+    }
+  end
+
+  let(:context) do
+    make_context(site_config)
+  end
+  let(:tag) { Liquid::Template.parse("{% crypto_donations Additional text %}").render(context) }
+
+  describe "#render" do
+    it "returns the HTML with all donation addresses" do
+      expect(tag).to include("Support Us with Crypto Donations")
+      expect(tag).to include("Additional text")
+      expect(tag).to include("btc_test_address")
+      expect(tag).to include("eth_test_address")
+      expect(tag).to include("usdt_test_address")
+      expect(tag).to include("getDonations('btc', 'btc_test_address')")
+      expect(tag).to include("getDonations('eth', 'eth_test_address')")
+      expect(tag).to include("getDonations('usdt', 'usdt_test_address')")
+    end
+
+    context "when config not includes BTC address" do
+      let(:site_config) do
+        {
+          "eth_address" => "eth_test_address",
+          "usdt_address" => "usdt_test_address"
+        }
+      end
+
+      it "does not include BTC section" do
+        expect(tag).not_to include("Bitcoin (BTC)")
+        expect(tag).not_to include("btc_test_address")
+        expect(tag).not_to include("getDonations('btc', 'btc_test_address')")
+      end
+    end
+
+    context "when config not includes ETH address" do
+      let(:site_config) do
+        {
+          "btc_address" => "btc_test_address",
+          "usdt_address" => "usdt_test_address"
+        }
+      end
+
+      it "does not include ETH section" do
+        expect(tag).not_to include("Ethereum (ETH)")
+        expect(tag).not_to include("eth_test_address")
+        expect(tag).not_to include("getDonations('eth', 'eth_test_address')")
+      end
+    end
+
+    context "when config not includes USDT address" do
+      let(:site_config) do
+        {
+          "btc_address" => "btc_test_address",
+          "eth_address" => "eth_test_address"
+        }
+      end
+
+      it "does not include USDT section" do
+        expect(tag).not_to include("USDT (TRC-20)")
+        expect(tag).not_to include("usdt_test_address")
+        expect(tag).not_to include("getDonations('usdt', 'usdt_test_address')")
+      end
+    end
+
+    context "when no donation addresses are provided" do
+      let(:site_config) do
+        {}
+      end
+      it "returns empty string" do
+        expect(tag).to be_empty
+      end
+    end
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 8dfd334..7df9f87 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -13,3 +13,17 @@
     c.syntax = :expect
   end
 end
+
+require "jekyll"
+
+Jekyll.logger = Logger.new(StringIO.new)
+
+def make_site
+  Jekyll::Site.new(Jekyll.configuration)
+end
+
+def make_context(value = nil)
+  site = make_site
+  site.config["crypto_donations"] = value
+  Liquid::Context.new({}, {}, site: site)
+end