test(graders): add easy_grader tests — empty, good, bad episode and range check

tests/test_graders.py

@@ -0,0 +1,17 @@
+from graders.easy_grader import grade_easy
+
+def test_easy_grader():
+    # Empty history
+    assert grade_easy([]) == 0.0
+    
+    # Successful attack
+    history = [{"attack_success_estimate": 0.9}]
+    assert grade_easy(history) == 0.9
+    
+    # Failed attack
+    history = [{"attack_success_estimate": 0.1}]
+    assert grade_easy(history) == 0.1
+    
+    # Range check
+    history = [{"attack_success_estimate": 1.5}]
+    assert grade_easy(history) == 1.0