Add test coverage for custom theme variable to block-size

Author: stevecochrane

tests/output/allPlugins.js

@@ -5950,6 +5950,9 @@ module.exports = `
     .bs-svh {
       block-size: 100svh;
     }
+    .bs-theme-variable {
+      block-size: calc(var(--spacing) * 35);
+    }
     .divide-b-reverse {
       & > :not(:last-child) {
         --tw-divide-b-reverse: 1;

tests/output/blockSize.js

@@ -410,5 +410,8 @@ module.exports = `
     .bs-svh {
       block-size: 100svh;
     }
+    .bs-theme-variable {
+      block-size: calc(var(--spacing) * 35);
+    }
   }
 `;

tests/templates/blockSize/blockSize.html

@@ -59,5 +59,6 @@
     <div class="bs-min"></div>
     <div class="bs-max"></div>
     <div class="bs-fit"></div>
+    <div class="bs-theme-variable"></div>
   </body>
 </html>