[Color 4] Add tests for oklch()

spec/core_functions/color/oklch/README.md

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+Some of the same behavior tested for `lab()` applies to this function as well,
+but for terseness' sake isn't tested explicitly.

spec/core_functions/color/oklch/_utils.scss

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+@use 'sass:color';
+@use 'sass:list';
+@use 'sass:meta';
+
+@function -real-channel($color, $channel) {
+  @if color.is-missing($color, $channel) {
+    @return none;
+  } @else {
+    @return color.channel($color, $channel);
+  }
+}
+
+@mixin inspect($color) {
+  a {
+    value: $color;
+    @if meta.type-of($color) == string {
+      type: string;
+    } @else {
+      channels: list.slash(
+        -real-channel($color, 'lightness')
+          -real-channel($color, 'chroma')
+          -real-channel($color, 'hue'),
+        -real-channel($color, 'alpha')
+      );
+    }
+  }
+}

spec/core_functions/color/oklch/alpha.hrx

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+<===> transparent/input.scss
+@use 'core_functions/color/lch/utils';
+@include utils.inspect(oklch(1% 0.2 3deg / 0));
+
+<===> transparent/output.css
+a {
+  value: oklch(1% 0.2 3deg / 0);
+  channels: 1% 0.2 3deg / 0;
+}
+
+<===>
+================================================================================
+<===> opaque/input.scss
+@use 'core_functions/color/lch/utils';
+@include utils.inspect(oklch(1% 0.2 3deg / 1));
+
+<===> opaque/output.css
+a {
+  value: oklch(1% 0.2 3deg);
+  channels: 1% 0.2 3deg / 1;
+}
+
+<===>
+================================================================================
+<===> partial/input.scss
+@use 'core_functions/color/lch/utils';
+@include utils.inspect(oklch(1% 0.2 3deg / 0.4));
+
+<===> partial/output.css
+a {
+  value: oklch(1% 0.2 3deg / 0.4);
+  channels: 1% 0.2 3deg / 0.4;
+}
+
+<===>
+================================================================================
+<===> percent/input.scss
+@use 'core_functions/color/lch/utils';
+@include utils.inspect(oklch(1% 0.2 3deg / 40%));
+
+<===> percent/output.css
+a {
+  value: oklch(1% 0.2 3deg / 0.4);
+  channels: 1% 0.2 3deg / 0.4;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+@use 'core_functions/color/lch/utils';
+@include utils.inspect(oklch($channels: 1% 0.2 3deg / 0.4));
+
+<===> named/output.css
+a {
+  value: oklch(1% 0.2 3deg / 0.4);
+  channels: 1% 0.2 3deg / 0.4;
+}
+
+<===>
+================================================================================
+<===> slash_list/input.scss
+@use "sass:list";
+@use 'core_functions/color/lch/utils';
+@include utils.inspect(oklch(list.slash(1% 0.2 3deg, 0.4)));
+
+<===> slash_list/output.css
+a {
+  value: oklch(1% 0.2 3deg / 0.4);
+  channels: 1% 0.2 3deg / 0.4;
+}
+
+<===>
+================================================================================
+<===> none/slash/hue/input.scss
+@use 'core_functions/color/lch/utils';
+@include utils.inspect(oklch(1% 0.2 none / 0.4));
+
+<===> none/slash/hue/output.css
+a {
+  value: oklch(1% 0.2 none / 0.4);
+  channels: 1% 0.2 none / 0.4;
+}
+
+<===>
+================================================================================
+<===> none/slash/alpha/input.scss
+@use 'core_functions/color/lch/utils';
+@include utils.inspect(oklch(1% 0.2 3deg / none));
+
+<===> none/slash/alpha/output.css
+a {
+  value: oklch(1% 0.2 3deg / none);
+  channels: 1% 0.2 3deg / none;
+}
+
+<===>
+================================================================================
+<===> none/slash_list/hue/input.scss
+@use 'sass:list';
+@use 'core_functions/color/lch/utils';
+@include utils.inspect(oklch(list.slash(1% 0.2 none, 0.4)));
+
+<===> none/slash_list/hue/output.css
+a {
+  value: oklch(1% 0.2 none / 0.4);
+  channels: 1% 0.2 none / 0.4;
+}
+
+<===>
+================================================================================
+<===> none/slash_list/alpha/input.scss
+@use 'sass:list';
+@use 'core_functions/color/lch/utils';
+@include utils.inspect(oklch(list.slash(1% 0.2 3deg, none)));
+
+<===> none/slash_list/alpha/output.css
+a {
+  value: oklch(1% 0.2 3deg / none);
+  channels: 1% 0.2 3deg / none;
+}