Add basic system-program tests

web3.js/test/system-program.test.js

@@ -0,0 +1,55 @@
+// @flow
+
+import {Account, SystemProgram, BudgetProgram} from '../src';
+
+test('createAccount', () => {
+  const from = new Account();
+  const newAccount = new Account();
+  let transaction;
+
+  transaction = SystemProgram.createAccount(
+    from.publicKey,
+    newAccount.publicKey,
+    123,
+    BudgetProgram.space,
+    BudgetProgram.programId,
+  );
+
+  expect(transaction.keys).toHaveLength(2);
+  expect(transaction.programId).toEqual(SystemProgram.programId);
+  // TODO: Validate transaction contents more
+});
+
+test('move', () => {
+  const from = new Account();
+  const to = new Account();
+  let transaction;
+
+  transaction = SystemProgram.move(
+    from.publicKey,
+    to.publicKey,
+    123,
+  );
+
+  expect(transaction.keys).toHaveLength(2);
+  expect(transaction.programId).toEqual(SystemProgram.programId);
+  // TODO: Validate transaction contents more
+});
+
+
+test('assign', () => {
+  const from = new Account();
+  const to = new Account();
+  let transaction;
+
+  transaction = SystemProgram.assign(
+    from.publicKey,
+    to.publicKey,
+  );
+
+  expect(transaction.keys).toHaveLength(1);
+  expect(transaction.programId).toEqual(SystemProgram.programId);
+  // TODO: Validate transaction contents more
+});
+
+