feat: Add partial Svelte test and related snapshot

This commit introduces a new test for partial Svelte files. It also
includes the corresponding snapshot for the test. Additionally, new
CSS files have been added to the test project to support the test.

Author: ryoppippi

__snapshots__/mod_test.ts.snap

@@ -22,3 +22,37 @@ div {
 </style>
 \`
 `;
+
+snapshot[`example svelte partial 1`] = `
+\`<script>
+  let name = 'world';
+</script>
+
+<div class="m2">This is a paragraph</div>
+<p id="message">This is a paragraph</p>
+
+<style>
+  
+div {
+  color: red;
+  background: blue;
+}
+
+
+  
+p {
+  color: blue;
+}
+
+.m2 {
+  background: yellow;
+}
+
+
+
+ #message {
+    text-decoration: underline;
+  }
+</style>
+\`
+`;

mod_test.ts

@@ -20,3 +20,20 @@ Deno.test(
     await assertSnapshot(t, code);
   },
 );
+Deno.test(
+  "example svelte partial",
+  async function (t) {
+    const filename = join(
+      import.meta.dirname as string,
+      "./test_project/Partial.svelte",
+    );
+    const source = Deno.readTextFileSync(filename);
+    const { code } = await preprocess(
+      source,
+      [importCSSPreprocess()],
+      { filename },
+    );
+
+    await assertSnapshot(t, code);
+  },
+);

test_project/Partial.svelte

@@ -0,0 +1,15 @@
+<script>
+  let name = 'world';
+</script>
+
+<div class="m2">This is a paragraph</div>
+<p id="message">This is a paragraph</p>
+
+<style>
+  @import './main.css#div' scoped;
+  @import './partial.css?p&.m2' scoped;
+
+ #message {
+    text-decoration: underline;
+  }
+</style>

test_project/partial.css

@@ -0,0 +1,11 @@
+p {
+  color: blue;
+}
+
+h1 {
+  color: green;
+}
+
+.m2 {
+  background: yellow;
+}