diff --git a/integrations/cli/index.test.ts b/integrations/cli/index.test.ts
index f17ca0e6a..5b27558d1 100644
--- a/integrations/cli/index.test.ts
+++ b/integrations/cli/index.test.ts
@@ -285,18 +285,33 @@ describe.only('@source', () => {
           /*   {my-lib-1,my-lib-2}: expand */
           /*   *.html: only look for .html */
           @source '../node_modules/{my-lib-1,my-lib-2}/src/**/*.html';
-          @source './logo.{jpg,png}'; /* Don't worry about it */
+
+          /* We typically ignore these extensions, but now include them explicitly */
+          @source './logo.{jpg,png}';
+
+          /* Project C should apply auto source detection */
+          @source '../../project-c';
         `,
+
+        // Project A is the current folder, but we explicitly configured
+        // `source(project-b)`, therefore project-a should not be included in
+        // the output.
         'project-a/src/index.html': html`
           <div
             class="content-['SHOULD-NOT-EXIST-IN-OUTPUT'] content-['project-a/src/index.html']"
           ></div>
         `,
+
+        // Project A explicitly includes an extension we usually ignore,
+        // therefore it should be included in the output.
         'project-a/src/logo.jpg': html`
           <div
             class="content-['project-a/src/logo.jpg']"
           ></div>
         `,
+
+        // Project A explicitly includes node_modules/{my-lib-1,my-lib-2},
+        // therefore these files should be included in the output.
         'project-a/node_modules/my-lib-1/src/index.html': html`
           <div
             class="content-['project-a/node_modules/my-lib-1/src/index.html']"
@@ -307,22 +322,55 @@ describe.only('@source', () => {
             class="content-['project-a/node_modules/my-lib-2/src/index.html']"
           ></div>
         `,
+
+        // Project B is the configured `source(…)`, therefore auto source
+        // detection should include known extensions and folders in the output.
         'project-b/src/index.html': html`
           <div
             class="content-['project-b/src/index.html']"
           ></div>
         `,
+
+        // Project B is the configured `source(…)`, therefore auto source
+        // detection should apply and node_modules should not be included in the
+        // output.
         'project-b/node_modules/my-lib-3/src/index.html': html`
           <div
             class="content-['SHOULD-NOT-EXIST-IN-OUTPUT'] content-['project-b/node_modules/my-lib-3/src/index.html']"
           ></div>
         `,
+
+        // Project C should apply auto source detection, therefore known
+        // extensions and folders should be included in the output.
+        'project-c/src/index.html': html`
+          <div
+            class="content-['project-c/src/index.html']"
+          ></div>
+        `,
+
+        // Project C should apply auto source detection, therefore known ignored
+        // extensions should not be included in the output.
+        'project-c/src/logo.jpg': html`
+          <div
+            class="content-['SHOULD-NOT-EXIST-IN-OUTPUT'] content-['project-c/src/logo.jpg']"
+          ></div>
+        `,
+
+        // Project C should apply auto source detection, therefore node_modules
+        // should not be included in the output.
+        'project-c/node_modules/my-lib-1/src/index.html': html`
+          <div
+            class="content-['SHOULD-NOT-EXIST-IN-OUTPUT'] content-['project-c/node_modules/my-lib-1/src/index.html']"
+          ></div>
+        `,
       },
     },
     async ({ fs, exec, root }) => {
-      await exec('pnpm tailwindcss --input src/index.css --output dist/out.css', {
-        cwd: path.join(root, 'project-a'),
-      })
+      console.log(
+        await exec('pnpm tailwindcss --input src/index.css --output dist/out.css', {
+          cwd: path.join(root, 'project-a'),
+        }),
+      )
 
       expect(await fs.dumpFiles('./project-a/dist/*.css')).toMatchInlineSnapshot(`
         "
@@ -344,6 +392,10 @@ describe.only('@source', () => {
             --tw-content: 'project-b/src/index.html';
             content: var(--tw-content);
           }
+          .content-\\[\\'project-c\\/src\\/index\\.html\\'\\] {
+            --tw-content: 'project-c/src/index.html';
+            content: var(--tw-content);
+          }
         }
         @supports (-moz-orient: inline) {
           @layer base {