Unit tests for #644 coming out from real life compiling of BS4

Author: Cerdic

tests/inputs/at_root.scss

@@ -152,4 +152,22 @@ $table-padding: 10px !default;
   @at-root a#{&} {
     text-decoration: none;
   }
-}
+}
+
+@mixin badge-variant($bg) {
+  background-color: $bg;
+
+  @at-root a#{&} {
+    &:focus,
+    &.focus {
+      outline: 0;
+    }
+  }
+}
+
+.badge-primary {
+	@include badge-variant(blue);
+}
+.badge-secondary {
+	@include badge-variant(yellow);
+}

tests/outputs/at_root.css

@@ -92,3 +92,14 @@ body .second {
 a.badge {
   text-decoration: none; }
 
+
+.badge-primary {
+  background-color: blue; }
+    a.badge-primary:focus, a.badge-primary.focus {
+      outline: 0; }
+
+.badge-secondary {
+  background-color: yellow; }
+    a.badge-secondary:focus, a.badge-secondary.focus {
+      outline: 0; }
+

tests/outputs_numbered/at_root.css

@@ -118,3 +118,19 @@ tbody {
 a.badge {
 text-decoration: none; }
 
+/* line 168, inputs/at_root.scss */
+.badge-primary {
+  background-color: blue; }
+/* line 160, inputs/at_root.scss */
+/* line 161, inputs/at_root.scss */
+  a.badge-primary:focus, a.badge-primary.focus {
+    outline: 0; }
+
+/* line 171, inputs/at_root.scss */
+.badge-secondary {
+  background-color: yellow; }
+/* line 160, inputs/at_root.scss */
+/* line 161, inputs/at_root.scss */
+  a.badge-secondary:focus, a.badge-secondary.focus {
+    outline: 0; }
+