Call Git cmd_main directly

app/src/main/java/solutions/tretter/githugandroid/levels/MergeSquashLevel.kt

@@ -30,7 +30,11 @@ internal fun mergeSquashLevel(): Level = level(
         addCommit("Second commit", "file2")
         true
     },
-    validator = repoPredicate { repo -> "merge-squash" in repo.maintenanceActions && repo.commits.isNotEmpty() },
+    validator = repoPredicate { repo ->
+        repo.commits.firstOrNull()?.message == "Merge long feature" &&
+            repo.commits.firstOrNull()?.parentCount == 1 &&
+            repo.files.any { it.name == "file3" && it.tracked }
+    },
     testCases = listOf(
         levelTestCase("squash merge then commit", "git merge --squash long-feature-branch", "git commit -m \"Merge long feature\""),
     ),