Merge #56: Clean up tests

13c8e9f integration_test: Improve get_balance test (Tobin C. Harding)
52cf6d3 integration_test: Use fund_wallet (Tobin C. Harding)

Pull request description:

  Do some trivial integration test clean ups.

ACKs for top commit:
  apoelstra:
    utACK 13c8e9f

Tree-SHA512: 1c19a4aebaad444c8e2bdf0698d3d1ea99e7d4256082425175bb11792b02af37997f45411e9fe12a70dd9d93c67f97f18e81febc0683aef1b5769a7c87790734

integration_test/tests/wallet.rs

@@ -87,15 +87,18 @@ pub fn get_address_info() {
 fn get_balance() {
     let node = Node::new_with_default_wallet();
     let json = node.client.get_balance().expect("getbalance");
-    assert!(json.into_model().is_ok())
+    assert!(json.into_model().is_ok());
+
+    node.fund_wallet();
+    let json = node.client.get_balance().expect("getbalance");
+    assert!(json.into_model().is_ok());
 }
 
 #[test]
 #[cfg(feature = "v19")]
 fn get_balances() {
     let node = Node::new_with_default_wallet();
-    let address = node.client.new_address().expect("failed to get new address");
-    let _ = node.client.generate_to_address(101, &address).expect("generatetoaddress");
+    node.fund_wallet();
     let json = node.client.get_balances().expect("getbalances");
     let model = json.into_model().expect("into_model");
     // TODO: Do more fine grained testing.
@@ -104,8 +107,6 @@ fn get_balances() {
 
 #[test]
 fn get_new_address() {
-
-
     let node = Node::new_with_default_wallet();
 
     let _ = node.client.new_address().expect("getnewaddress");
@@ -159,8 +160,8 @@ fn get_received_by_address() {
 #[test]
 fn get_transaction() {
     let node = Node::new_with_default_wallet();
+    node.fund_wallet();
     let address = node.client.new_address().expect("failed to create new address");
-    let _ = node.client.generate_to_address(101, &address).expect("generatetoaddress");
 
     let txid = node
         .client
@@ -193,8 +194,8 @@ fn unload_wallet() {
 #[test]
 fn send_to_address() {
     let node = Node::new_with_default_wallet();
+    node.fund_wallet();
     let address = node.client.new_address().expect("failed to create new address");
-    let _ = node.client.generate_to_address(101, &address).expect("generatetoaddress");
 
     let json = node
         .client