tests(app): 🥶 test that community pool can be frozen

this adds a complimentary test to the previous test case, showing that
we cannot make a community pool deposit if the pool is currently frozen.

crates/core/app/tests/app_cannot_deposit_into_community_pool_when_disabled.rs

@@ -0,0 +1,114 @@
+use {
+    self::common::BuilderExt,
+    anyhow::anyhow,
+    cnidarium::TempStorage,
+    penumbra_app::{
+        genesis::{AppState, Content},
+        server::consensus::Consensus,
+    },
+    penumbra_community_pool::{CommunityPoolDeposit, StateReadExt},
+    penumbra_keys::test_keys,
+    penumbra_mock_client::MockClient,
+    penumbra_mock_consensus::TestNode,
+    penumbra_proto::DomainType,
+    penumbra_shielded_pool::SpendPlan,
+    penumbra_transaction::{TransactionParameters, TransactionPlan},
+    rand_core::OsRng,
+    tap::{Tap, TapFallible},
+    tracing::info,
+};
+
+mod common;
+
+/// Exercises that the app can *NOT* deposit a note into the community pool when disabled.
+#[tokio::test]
+async fn app_cannot_deposit_into_community_pool_when_disabled() -> anyhow::Result<()> {
+    // Install a test logger, and acquire some temporary storage.
+    let guard = common::set_tracing_subscriber();
+    let storage = TempStorage::new().await?;
+
+    // Define our application state, and start the test node.
+    let mut test_node = {
+        let app_state = AppState::Content(Content {
+            governance_content: penumbra_governance::genesis::Content {
+                governance_params: penumbra_governance::params::GovernanceParameters {
+                    community_pool_is_frozen: true,
+                    ..Default::default()
+                },
+            },
+            ..Default::default()
+        });
+        let consensus = Consensus::new(storage.as_ref().clone());
+        TestNode::builder()
+            .single_validator()
+            .with_penumbra_auto_app_state(app_state)?
+            .init_chain(consensus)
+            .await
+            .tap_ok(|e| tracing::info!(hash = %e.last_app_hash_hex(), "finished init chain"))?
+    };
+
+    // Sync the mock client, using the test wallet's spend key, to the latest snapshot.
+    let client = MockClient::new(test_keys::SPEND_KEY.clone())
+        .with_sync_to_storage(&storage)
+        .await?
+        .tap(|c| info!(client.notes = %c.notes.len(), "mock client synced to test storage"));
+
+    // Take one of the test wallet's notes, and prepare to deposit it in the community pool.
+    let note = client
+        .notes
+        .values()
+        .cloned()
+        .next()
+        .ok_or_else(|| anyhow!("mock client had no note"))?;
+
+    // Create a community pool transaction.
+    let mut plan = {
+        let value = note.value();
+        let spend = SpendPlan::new(
+            &mut OsRng,
+            note.clone(),
+            client
+                .position(note.commit())
+                .ok_or_else(|| anyhow!("input note commitment was unknown to mock client"))?,
+        )
+        .into();
+        let deposit = CommunityPoolDeposit { value }.into();
+        TransactionPlan {
+            actions: vec![spend, deposit],
+            // Now fill out the remaining parts of the transaction needed for verification:
+            memo: None,
+            detection_data: None, // We'll set this automatically below
+            transaction_parameters: TransactionParameters {
+                chain_id: TestNode::<()>::CHAIN_ID.to_string(),
+                ..Default::default()
+            },
+        }
+    };
+    plan.populate_detection_data(OsRng, 0);
+    let tx = client.witness_auth_build(&plan).await?;
+
+    // Execute the transaction, applying it to the chain state.
+    let pre_tx_snapshot = storage.latest_snapshot();
+    test_node
+        .block()
+        .with_data(vec![tx.encode_to_vec()])
+        .execute()
+        .await?;
+    let post_tx_snapshot = storage.latest_snapshot();
+
+    // Show that nothing happened.
+    {
+        let pre_tx_balance = pre_tx_snapshot.community_pool_balance().await?;
+        let post_tx_balance = post_tx_snapshot.community_pool_balance().await?;
+        assert_eq!(
+            pre_tx_balance, post_tx_balance,
+            "community pool should not have been updated"
+        );
+    }
+
+    // Free our temporary storage.
+    Ok(())
+        .tap(|_| drop(test_node))
+        .tap(|_| drop(storage))
+        .tap(|_| drop(guard))
+}