fix(inline-snapshots): detect linebreaks

packages/vitest/src/integrations/snapshot/port/utils.ts

@@ -161,8 +161,18 @@ export async function saveSnapshotFile(
 
 export function prepareExpected(expected?: string) {
   function findStartIndent() {
-    const match = /^( +)}\s+$/m.exec(expected || '')
-    return match?.[1]?.length || 0
+    // Attemps to find indentation for objects.
+    // Matches the ending tag of the object.
+    const matchObject = /^( +)}\s+$/m.exec(expected || '')
+    const objectIndent = matchObject?.[1]?.length
+
+    if (objectIndent)
+      return objectIndent
+
+    // Attempts to find indentation for texts.
+    // Matches the quote of first line.
+    const matchText = /^\n( +)"/.exec(expected || '')
+    return matchText?.[1]?.length || 0
   }
 
   const startIndent = findStartIndent()

test/core/test/snapshot-inline.test.ts

@@ -80,6 +80,15 @@ test('throwing inline snapshots', () => {
       },
     }
   `)
+
+  expect(() => {
+    throw ['Inline', 'snapshot', 'with', 'newlines'].join('\n')
+  }).toThrowErrorMatchingInlineSnapshot(`
+    "Inline
+    snapshot
+    with
+    newlines"
+  `)
 })
 
 test('properties inline snapshot', () => {