57 lines
2.0 KiB
Nim
57 lines
2.0 KiB
Nim
import std/unittest
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import std/strutils
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import pkg/questionable/results
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import pkg/contractabi
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import pkg/ethers/errors
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import pkg/ethers/errors/encoding
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suite "Decoding of custom errors":
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type
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SimpleError = object of SolidityError
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ErrorWithArguments = object of SolidityError
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arguments: tuple[one: UInt256, two: bool]
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test "decodes a simple error":
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let decoded = SimpleError.decode(@[0xc2'u8, 0xbb, 0x94, 0x7c])
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check decoded is ?!(ref SimpleError)
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check decoded.isSuccess
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check (!decoded).msg.contains("SimpleError()")
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test "decodes error with arguments":
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let expected = (ref ErrorWithArguments)(arguments: (1.u256, true))
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let encoded = AbiEncoder.encode(expected)
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let decoded = ErrorWithArguments.decode(encoded)
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check decoded.isSuccess
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check (!decoded).arguments.one == 1.u256
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check (!decoded).arguments.two == true
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check (!decoded).msg.contains("ErrorWithArguments(one: 1, two: true)")
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test "returns failure when decoding fails":
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let invalid = @[0xc2'u8, 0xbb, 0x94, 0x0] # last byte is wrong
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let decoded = SimpleError.decode(invalid)
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check decoded.isFailure
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test "returns failure when data is less than 4 bytes":
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let invalid = @[0xc2'u8, 0xbb, 0x94]
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let decoded = SimpleError.decode(invalid)
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check decoded.isFailure
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test "returns failure when there are trailing bytes":
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let invalid = @[0xc2'u8, 0xbb, 0x94, 0x7c, 0x0] # one byte too many
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let decoded = SimpleError.decode(invalid)
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check decoded.isFailure
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test "returns failure when there are trailing bytes after arguments":
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let error = (ref ErrorWithArguments)(arguments: (1.u256, true))
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let encoded = AbiEncoder.encode(error)
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let invalid = encoded & @[0x0'u8] # one byte too many
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let decoded = ErrorWithArguments.decode(invalid)
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check decoded.isFailure
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test "decoding only works for SolidityErrors":
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type InvalidError = ref object of CatchableError
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const works = compiles:
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InvalidError.decode(@[0x1'u8, 0x2, 0x3, 0x4])
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check not works
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