fix hyphen usage (#182)

* fix hyphen usage
Co-Authored-By: Tobias Bieniek <[email protected]>

Author: tylerturdenpants

transforms/angle-brackets/test.js

@@ -1001,3 +1001,25 @@ test('component-else', () => {
       "
   `);
 });
+
+test('hyphens with nested usage', () => {
+  let input = `
+    {{shared/documents-modal/-email-client}}
+    {{shared/-documents-modal/-email-client}}
+    {{-shared/-documents-modal/-email-client}}
+    {{-shared/documents-modal/-email-client}}
+    {{-shared/documents-modal/email-client}}
+    {{shared/-documents-modal/email-client}}
+  `;
+
+  expect(runTest('hyphens-everywhere.hbs', input)).toMatchInlineSnapshot(`
+    "
+        <Shared::DocumentsModal::-EmailClient />
+        <Shared::-DocumentsModal::-EmailClient />
+        <-Shared::-DocumentsModal::-EmailClient />
+        <-Shared::DocumentsModal::-EmailClient />
+        <-Shared::DocumentsModal::EmailClient />
+        <Shared::-DocumentsModal::EmailClient />
+      "
+  `);
+});

transforms/angle-brackets/transform.js

@@ -35,6 +35,7 @@ function capitalizedTagName(tagname) {
   return tagname
     .split('-')
     .map(s => {
+      if (!s) return '-';
       return s[0].toUpperCase() + s.slice(1);
     })
     .join('');