test: increasing test coverage

contracts/main/CurveTwocryptoOptimized.vy

@@ -1897,12 +1897,12 @@ def ramp_A_gamma(
     assert future_gamma < MAX_GAMMA + 1
 
     ratio: uint256 = 10**18 * future_A / A_gamma[0]
-    assert ratio < 10**18 * MAX_A_CHANGE + 1
-    assert ratio > 10**18 / MAX_A_CHANGE - 1
+    assert ratio < 10**18 * MAX_A_CHANGE + 1 # dev: A change too high
+    assert ratio > 10**18 / MAX_A_CHANGE - 1 # dev: A change too low
 
     ratio = 10**18 * future_gamma / A_gamma[1]
-    assert ratio < 10**18 * MAX_A_CHANGE + 1
-    assert ratio > 10**18 / MAX_A_CHANGE - 1
+    assert ratio < 10**18 * MAX_A_CHANGE + 1 # dev: gamma change too high
+    assert ratio > 10**18 / MAX_A_CHANGE - 1 # dev: gamma change too low
 
     self.initial_A_gamma = initial_A_gamma
     self.initial_A_gamma_time = block.timestamp

tests/unitary/pool/admin/test_revert_ramp.py

@@ -9,6 +9,7 @@ def test_revert_unauthorised_ramp(swap, user):
 
 def test_revert_ramp_while_ramping(swap, factory_admin):
 
+    # sanity check: ramping is not active
     assert swap.initial_A_gamma_time() == 0
 
     A_gamma = [swap.A(), swap.gamma()]
@@ -30,6 +31,7 @@ def test_revert_fast_ramps(swap, factory_admin):
 
 def test_revert_unauthorised_stop_ramp(swap, factory_admin, user):
 
+    # sanity check: ramping is not active
     assert swap.initial_A_gamma_time() == 0
 
     A_gamma = [swap.A(), swap.gamma()]
@@ -39,3 +41,27 @@ def test_revert_unauthorised_stop_ramp(swap, factory_admin, user):
 
     with boa.env.prank(user), boa.reverts(dev="only owner"):
         swap.stop_ramp_A_gamma()
+
+
+def test_revert_ramp_too_far(swap, factory_admin):
+
+    # sanity check: ramping is not active
+    assert swap.initial_A_gamma_time() == 0
+
+    A = swap.A()
+    gamma = swap.gamma()
+    future_time = boa.env.vm.state.timestamp + 86400 + 1
+
+    with boa.env.prank(factory_admin), boa.reverts("A change too high"):
+        future_A = A * 11  # can at most increase by 10x
+        swap.ramp_A_gamma(future_A, gamma, future_time)
+    with boa.env.prank(factory_admin), boa.reverts("A change too low"):
+        future_A = A // 11  # can at most decrease by 10x
+        swap.ramp_A_gamma(future_A, gamma, future_time)
+
+    with boa.env.prank(factory_admin), boa.reverts("gamma change too high"):
+        future_gamma = gamma * 10  # can at most increase by 10x
+        swap.ramp_A_gamma(A, future_gamma, future_time)
+    with boa.env.prank(factory_admin), boa.reverts("gamma change too low"):
+        future_gamma = gamma // 11  # can at most decrease by 10x
+        swap.ramp_A_gamma(A, future_gamma, future_time)