fixed typo (#11825)

diff --git a/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.js b/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.js
index 5e6d95c..0468cd9 100644
--- a/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.js
+++ b/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.js
@@ -1,4 +1,4 @@
-QUnit.module('Purchaes Invoice');
+QUnit.module('Purchase Invoice');
 
 QUnit.test("test purchase invoice", function(assert) {
 	assert.expect(4);