Fix upstream fixture-backed level setups

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

@@ -13,7 +13,36 @@ internal fun findOldBranchLevel(): Level = level(
     description = "You have been working on a branch but got distracted by a major issue. Switch back to that branch even though you forgot the name of it.",
     hints = listOf("Ever played with the `git reflog` command?"),
     commandSuggestions = listOf("git checkout solve_world_hunger"),
-    setup = { RepoState(initialized = true, branches = mapOf("master" to 1, "solve_world_hunger" to 2)) },
+    setup = {
+        RepoState(
+            initialized = true,
+            headBranch = "master",
+            files = listOf(
+                GitFile("myfile.txt", "THIS TEXT DOESN'T MATTER\n", tracked = true),
+                GitFile("TODO", "FIND THE JOKER\n", tracked = true),
+            ),
+            branches = mapOf(
+                "blowup_sun_for_ransom" to 1,
+                "cure_common_cold" to 1,
+                "master" to 2,
+                "solve_world_hunger" to 2,
+            ),
+        )
+    },
+    nativeSetup = {
+        resetFiles()
+        write("myfile.txt", "THIS TEXT DOESN'T MATTER\n")
+        addCommit("initial commit", "myfile.txt")
+        git("branch", "blowup_sun_for_ransom")
+        git("branch", "cure_common_cold")
+        checkoutNew("solve_world_hunger")
+        write("TODO", "FIX WORLD HUNGER\n")
+        addCommit("commit todo", "TODO")
+        checkout("master")
+        write("TODO", "FIND THE JOKER\n")
+        addCommit("commit another todo", "TODO")
+        true
+    },
     validator = repoPredicate { repo -> repo.headBranch == "solve_world_hunger" },
     testCases = listOf(
         levelTestCase("checkout old branch", "git checkout solve_world_hunger"),