increase test coverage

packages/selector-resolve-nested/test/flatten-nested-selector/partial.mjs

@@ -0,0 +1,12 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { flattenNestedSelector } from '@csstools/selector-resolve-nested';
+import parser from 'postcss-selector-parser';
+
+test('partial', async () => {
+	const a = parser().astSync('&:hover');
+	const b = parser().astSync('a');
+
+	const ba = flattenNestedSelector(b, a);
+	assert.equal(ba.toString(), '&:hover a');
+});

packages/selector-resolve-nested/test/index.mjs

@@ -4,11 +4,13 @@ import './compound.mjs';
 import './resolve-nested-selector/lists.mjs';
 import './resolve-nested-selector/multiple-resolves.mjs';
 import './resolve-nested-selector/parent.mjs';
+import './resolve-nested-selector/partial.mjs';
 import './resolve-nested-selector/simple-compound-complex.mjs';
 import './resolve-nested-selector/source-indices.mjs';
 
 import './flatten-nested-selector/lists.mjs';
 import './flatten-nested-selector/multiple-resolves.mjs';
 import './flatten-nested-selector/parent.mjs';
+import './flatten-nested-selector/partial.mjs';
 import './flatten-nested-selector/simple-compound-complex.mjs';
 import './flatten-nested-selector/source-indices.mjs';

packages/selector-resolve-nested/test/resolve-nested-selector/partial.mjs

@@ -0,0 +1,12 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { resolveNestedSelector } from '@csstools/selector-resolve-nested';
+import parser from 'postcss-selector-parser';
+
+test('partial', async () => {
+	const a = parser().astSync('&:hover');
+	const b = parser().astSync('a');
+
+	const ba = resolveNestedSelector(b, a);
+	assert.equal(ba.toString(), '&:hover a');
+});