add tests for first class mixins

spec/core_functions/meta/accepts_content.hrx

@@ -0,0 +1,40 @@
+<===> accepts/direct-child/input.scss
+@use "sass:meta";
+
+@mixin foo() {
+    @content;
+}
+
+a {b: meta.accepts-content(meta.get-mixin("foo"))}
+
+<===> accepts/direct-child/output.css
+a {
+  b: true;
+}
+
+<===> accepts/nested-child/input.scss
+@use "sass:meta";
+
+@mixin foo() {
+    @if false {
+        @content;
+    }
+}
+
+a {b: meta.accepts-content(meta.get-mixin("foo"))}
+
+<===> accepts/nested-child/output.css
+a {
+  b: true;
+}
+
+<===> doesnt-accept/empty/input.scss
+@use "sass:meta";
+@mixin foo() {}
+
+a {b: meta.accepts-content(meta.get-mixin("foo"))}
+
+<===> doesnt-accept/empty/output.css
+a {
+  b: false;
+}

spec/core_functions/meta/apply.hrx

@@ -0,0 +1 @@
+// todo

spec/core_functions/meta/get_mixin/content.hrx

@@ -0,0 +1 @@
+// todo

spec/core_functions/meta/get_mixin/different_module.hrx

@@ -0,0 +1,137 @@
+<===>
+================================================================================
+<===> defined/input.scss
+@use "sass:meta";
+@use "foo";
+a {@include meta.apply(meta.get-mixin("foo", $module: "color"), #abcdef)}
+
+<===> chosen_prefix/foo.scss
+@mixin foo($color) {
+  b: red($color)
+}
+
+<===> defined/output.css
+a {
+  b: 171;
+}
+
+<===>
+================================================================================
+<===> chosen_prefix/input.scss
+@use "sass:meta";
+@use "foo" as a;
+b {@include meta.apply(meta.get-mixin("foo", $module: "a"), #abcdef)}
+
+<===> chosen_prefix/foo.scss
+@mixin foo($color) {
+  c: red($color)
+}
+
+<===> chosen_prefix/output.css
+b {
+  c: 171;
+}
+
+<===>
+================================================================================
+<===> through_use/input.scss
+@use "sass:meta";
+@use "other" as *;
+a {@include meta.apply(meta.get-mixin(add-two), 10)}
+
+<===> through_use/other.scss
+@mixin add-two($v) {b: $v + 2}
+
+<===> through_use/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> through_forward/bare/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(c))}
+
+<===> through_forward/bare/_midstream.scss
+@forward "upstream";
+
+<===> through_forward/bare/_upstream.scss
+@mixin c() {b: c}
+
+<===> through_forward/bare/output.css
+a {
+  b: c;
+}
+
+<===>
+================================================================================
+<===> through_forward/as/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(c-d))}
+
+<===> through_forward/as/_midstream.scss
+@forward "upstream" as c-*;
+
+<===> through_forward/as/_upstream.scss
+@mixin d() {b: d}
+
+<===> through_forward/as/output.css
+a {
+  b: d;
+}
+
+<===>
+================================================================================
+<===> through_forward/show/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(c))}
+
+<===> through_forward/show/_midstream.scss
+@forward "upstream" show c;
+
+<===> through_forward/show/_upstream.scss
+@mixin c() {b: c}
+
+<===> through_forward/show/output.css
+a {
+  b: c;
+}
+
+<===>
+================================================================================
+<===> through_forward/hide/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(d))}
+
+<===> through_forward/hide/_midstream.scss
+@forward "upstream" hide c;
+
+<===> through_forward/hide/_upstream.scss
+@mixin d() {b: d}
+
+<===> through_forward/hide/output.css
+a {
+  b: d;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+@use "sass:meta";
+@use "foo";
+a {@include meta.apply(meta.get-mixin($name: "foo", $module: "color"), #abcdef)}
+
+<===> named/foo.scss
+@mixin foo($color) {
+  b: red($color)
+}
+
+<===> named/output.css
+a {
+  b: 171;
+}

spec/core_functions/meta/get_mixin/equality.hrx

@@ -0,0 +1,74 @@
+<===> same_value/input.scss
+@use "sass:meta";
+@mixin foo() {}
+$a: meta.get-mixin(foo);
+a {b: $a == $a}
+
+<===> same_value/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> built_in/same/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin(load-css, meta) == meta.get-mixin(load-css, meta)}
+
+<===> built_in/same/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> built_in/different/input.scss
+@use "sass:meta";
+@mixin foo() {}
+a {b: meta.get-mixin(load-css, meta) == meta.get-mixin(foo)}
+
+<===> built_in/different/output.css
+a {
+  b: false;
+}
+
+<===>
+================================================================================
+<===> user_defined/same/input.scss
+@use "sass:meta";
+@mixin user-defined() {}
+a {b: meta.get-mixin(user-defined) == meta.get-mixin(user-defined)}
+
+<===> user_defined/same/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> user_defined/different/input.scss
+@use "sass:meta";
+@mixin user-defined-1() {}
+@mixin user-defined-2() {}
+a {b: meta.get-mixin(user-defined-1) == meta.get-mixin(user-defined-2)}
+
+<===> user_defined/different/output.css
+a {
+  b: false;
+}
+
+<===>
+================================================================================
+<===> user_defined/redefined/input.scss
+@use "sass:meta";
+@mixin user-defined() {}
+$first-reference: meta.get-mixin(user-defined);
+
+@mixin user-defined() {}
+$second-reference: meta.get-mixin(user-defined);
+a {b: $first-reference == $second-reference}
+
+<===> user_defined/redefined/output.css
+a {
+  b: false;
+}