Fix link to "integration testing" page

jrodalo · web-flow · commit 44513140aa93 · 2021-09-01T18:07:52.000+01:00
The old link was pointing to `unit_testing.md` instead of `integration_testing.md`
diff --git a/src/cargo/test.md b/src/cargo/test.md
@@ -150,5 +150,5 @@ Ferris
 
 [testing]: ../testing.md
 [unit_testing]: ../testing/unit_testing.md
-[integration_testing]: ../testing/unit_testing.md
+[integration_testing]: ../testing/integration_testing.md
 [doc_testing]: ../testing/doc_testing.md
