Add test

src/snapshots/new_nu_parser__test__node_output@binary_ops_spaces.nu.snap

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+---
+source: src/test.rs
+expression: evaluate_example(path)
+input_file: tests/binary_ops_spaces.nu
+---
+==== COMPILER ====
+0: Int (0 to 1)
+1: Plus (2 to 3)
+2: Int (4 to 5)
+3: BinaryOp { lhs: NodeId(0), op: NodeId(1), rhs: NodeId(2) } (0 to 5)
+4: Int (6 to 7)
+5: Plus (7 to 8)
+6: Int (9 to 10)
+7: BinaryOp { lhs: NodeId(4), op: NodeId(5), rhs: NodeId(6) } (6 to 10)
+8: Int (11 to 12)
+9: Plus (13 to 14)
+10: Int (14 to 15)
+11: BinaryOp { lhs: NodeId(8), op: NodeId(9), rhs: NodeId(10) } (11 to 15)
+12: Int (16 to 17)
+13: Plus (17 to 18)
+14: Int (18 to 19)
+15: BinaryOp { lhs: NodeId(12), op: NodeId(13), rhs: NodeId(14) } (16 to 19)
+16: Block(BlockId(0)) (0 to 20)
+==== COMPILER ERRORS ====
+Error (NodeId 5): missing space before operator
+Error (NodeId 9): missing space after operator
+Error (NodeId 13): missing space before operator
+Error (NodeId 13): missing space after operator

tests/binary_ops_spaces.nu

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+1 + 2
+1+ 2
+1 +2
+1+2