Ask for last good commit in bisect level

app/src/test/java/solutions/tretter/githugandroid/LevelSolutionsTest.kt

@@ -139,6 +139,19 @@ class LevelSolutionsTest {
             "A normal commit using the current system date must not solve the commit_in_future level.",
             futureCommitExercise.validator(currentDateCommitRepo, "git commit -m \"Current date commit\""),
         )
+
+        val bisectExercise = bisectLevel()
+        val bisectRuntime = GitRepositoryRuntime(runtimeRoot, gitBinary)
+        var bisectRepo = bisectRuntime.prepareLevel(bisectExercise)
+        listOf("git bisect start", "git bisect bad HEAD", "git bisect good known-good").forEach { command ->
+            val (nextRepo, _) = bisectRuntime.execute(bisectExercise, bisectRepo, command)
+            bisectRepo = nextRepo
+        }
+        val (bisectRunRepo, _) = bisectRuntime.execute(bisectExercise, bisectRepo, "git bisect run ./test-balance.sh")
+        assertFalse(
+            "Running bisect should not solve the bisect level until the learner enters the last good commit hash.",
+            bisectExercise.validator(bisectRunRepo, "git bisect run ./test-balance.sh"),
+        )
     }
 
     private companion object {