From 3022ba6cab4badaa42e0dd7e4b9264987ad123ac Mon Sep 17 00:00:00 2001
From: Brooks Prumo <brooks@solana.com>
Date: Wed, 6 Apr 2022 18:25:39 -0500
Subject: [PATCH 1/2] Add test for GetMinimumDelegation stake instruction

---
 programs/stake/src/stake_instruction.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/programs/stake/src/stake_instruction.rs b/programs/stake/src/stake_instruction.rs
index d9499eab1def38..9c2cb9644fd4eb 100644
--- a/programs/stake/src/stake_instruction.rs
+++ b/programs/stake/src/stake_instruction.rs
@@ -5866,4 +5866,24 @@ mod tests {
         // Both fully deactivated works
         try_merge(transaction_accounts, instruction_accounts, Ok(()));
     }
+
+    #[test]
+    fn test_stake_get_minimum_delegation() {
+        let stake_address = Pubkey::new_unique();
+        let stake_account = create_default_stake_account();
+        let instruction_data = serialize(&StakeInstruction::GetMinimumDelegation).unwrap();
+        let transaction_accounts = vec![(stake_address, stake_account)];
+        let instruction_accounts = vec![AccountMeta {
+            pubkey: stake_address,
+            is_signer: false,
+            is_writable: false,
+        }];
+
+        process_instruction(
+            &instruction_data,
+            transaction_accounts,
+            instruction_accounts,
+            Ok(()),
+        );
+    }
 }

From d6af4bbc9c6a608258c23df82f7898c19c3434e8 Mon Sep 17 00:00:00 2001
From: Brooks Prumo <brooks@solana.com>
Date: Thu, 7 Apr 2022 08:59:48 -0500
Subject: [PATCH 2/2] pr: update test impl

---
 programs/stake/src/stake_instruction.rs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/programs/stake/src/stake_instruction.rs b/programs/stake/src/stake_instruction.rs
index 9c2cb9644fd4eb..6edf5fbd23afe8 100644
--- a/programs/stake/src/stake_instruction.rs
+++ b/programs/stake/src/stake_instruction.rs
@@ -5879,11 +5879,23 @@ mod tests {
             is_writable: false,
         }];
 
-        process_instruction(
+        mock_process_instruction(
+            &id(),
+            Vec::new(),
             &instruction_data,
             transaction_accounts,
             instruction_accounts,
+            None,
             Ok(()),
+            |first_instruction_account, invoke_context| {
+                super::process_instruction(first_instruction_account, invoke_context)?;
+                let expected_minimum_delegation =
+                    crate::get_minimum_delegation(&invoke_context.feature_set).to_le_bytes();
+                let actual_minimum_delegation =
+                    invoke_context.transaction_context.get_return_data().1;
+                assert_eq!(expected_minimum_delegation, actual_minimum_delegation);
+                Ok(())
+            },
         );
     }
 }