Add LedgerInfo setters (#1255)

### What

Resolves #745

soroban-sdk/src/ledger.rs

@@ -111,6 +111,54 @@ impl testutils::Ledger for Ledger {
         env.host().set_ledger_info(li).unwrap();
     }
 
+    fn set_protocol_version(&self, protocol_version: u32) {
+        self.with_mut(|ledger_info| {
+            ledger_info.protocol_version = protocol_version;
+        });
+    }
+
+    fn set_sequence_number(&self, sequence_number: u32) {
+        self.with_mut(|ledger_info| {
+            ledger_info.sequence_number = sequence_number;
+        });
+    }
+
+    fn set_timestamp(&self, timestamp: u64) {
+        self.with_mut(|ledger_info| {
+            ledger_info.timestamp = timestamp;
+        });
+    }
+
+    fn set_network_id(&self, network_id: [u8; 32]) {
+        self.with_mut(|ledger_info| {
+            ledger_info.network_id = network_id;
+        });
+    }
+
+    fn set_base_reserve(&self, base_reserve: u32) {
+        self.with_mut(|ledger_info| {
+            ledger_info.base_reserve = base_reserve;
+        });
+    }
+
+    fn set_min_temp_entry_ttl(&self, min_temp_entry_ttl: u32) {
+        self.with_mut(|ledger_info| {
+            ledger_info.min_temp_entry_ttl = min_temp_entry_ttl;
+        });
+    }
+
+    fn set_min_persistent_entry_ttl(&self, min_persistent_entry_ttl: u32) {
+        self.with_mut(|ledger_info| {
+            ledger_info.min_persistent_entry_ttl = min_persistent_entry_ttl;
+        });
+    }
+
+    fn set_max_entry_ttl(&self, max_entry_ttl: u32) {
+        self.with_mut(|ledger_info| {
+            ledger_info.max_entry_ttl = max_entry_ttl;
+        });
+    }
+
     fn get(&self) -> testutils::LedgerInfo {
         let env = self.env();
         env.host().with_ledger_info(|li| Ok(li.clone())).unwrap()

soroban-sdk/src/tests/max_ttl.rs

@@ -9,10 +9,8 @@ fn max() {
     let e = Env::default();
     let contract_id = e.register_contract(None, Contract);
 
-    let mut ledger_info = e.ledger().get();
-    ledger_info.sequence_number = 1;
-    ledger_info.max_entry_ttl = 5;
-    e.ledger().set(ledger_info);
+    e.ledger().set_sequence_number(1);
+    e.ledger().set_max_entry_ttl(5);
 
     e.as_contract(&contract_id, || {
         assert_eq!(e.storage().max_ttl(), 5);

soroban-sdk/src/testutils.rs

@@ -212,6 +212,30 @@ pub trait Ledger {
     /// Set ledger info.
     fn set(&self, l: LedgerInfo);
 
+    /// Sets the protocol version.
+    fn set_protocol_version(&self, protocol_version: u32);
+
+    /// Sets the sequence number.
+    fn set_sequence_number(&self, sequence_number: u32);
+
+    /// Sets the timestamp.
+    fn set_timestamp(&self, timestamp: u64);
+
+    /// Sets the network ID.
+    fn set_network_id(&self, network_id: [u8; 32]);
+
+    /// Sets the base reserve.
+    fn set_base_reserve(&self, base_reserve: u32);
+
+    /// Sets the minimum temporary entry time-to-live.
+    fn set_min_temp_entry_ttl(&self, min_temp_entry_ttl: u32);
+
+    /// Sets the minimum persistent entry time-to-live.
+    fn set_min_persistent_entry_ttl(&self, min_persistent_entry_ttl: u32);
+
+    /// Sets the maximum entry time-to-live.
+    fn set_max_entry_ttl(&self, max_entry_ttl: u32);
+
     /// Get ledger info.
     fn get(&self) -> LedgerInfo;