Added spec for issue #1291

spec/libsass-todo-issues/issue_1291/expected.compact.css

@@ -0,0 +1 @@
+.my-element { value: -3; value: 3; value: -5; value: 5; value: -7; value: 7; }

spec/libsass-todo-issues/issue_1291/expected.compressed.css

@@ -0,0 +1 @@
+.my-element{value:-3;value:3;value:-5;value:5;value:-7;value:7}

spec/libsass-todo-issues/issue_1291/expected.expanded.css

@@ -0,0 +1,8 @@
+.my-element {
+  value: -3;
+  value: 3;
+  value: -5;
+  value: 5;
+  value: -7;
+  value: 7;
+}

spec/libsass-todo-issues/issue_1291/expected_output.css

@@ -0,0 +1,7 @@
+.my-element {
+  value: -3;
+  value: 3;
+  value: -5;
+  value: 5;
+  value: -7;
+  value: 7; }

spec/libsass-todo-issues/issue_1291/input.scss

@@ -0,0 +1,22 @@
+@mixin spec1($decimal) {
+  $decimal: unquote($decimal) * -1;
+  value: $decimal;
+}
+
+@mixin spec2($decimal) {
+  $decimal: -1 * unquote($decimal);
+  value: $decimal;
+}
+
+@mixin spec3($decimal) {
+  value: #{$decimal * -1};
+}
+
+.my-element {
+  @include spec1(3);
+  @include spec1(-3);
+  @include spec2(5);
+  @include spec2(-5);
+  @include spec3(7);
+  @include spec3(-7);
+}