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# note: consider merging tests/assert/testhelper.nim here.
proc mismatch*[T](lhs: T, rhs: T): string =
## Simplified version of `unittest.require` that satisfies a common use case,
## while avoiding pulling too many dependencies. On failure, diagnostic
## information is provided that in particular makes it easy to spot
## whitespace mismatches and where the mismatch is.
proc replaceInvisible(s: string): string =
for a in s:
case a
of '\n': result.add "\\n\n"
else: result.add a
proc quoted(s: string): string = result.addQuoted s
result.add "\n"
result.add "lhs:{" & replaceInvisible(
$lhs) & "}\nrhs:{" & replaceInvisible($rhs) & "}\n"
when compiles(lhs.len):
if lhs.len != rhs.len:
result.add "lhs.len: " & $lhs.len & " rhs.len: " & $rhs.len & "\n"
when compiles(lhs[0]):
var i = 0
while i < lhs.len and i < rhs.len:
if lhs[i] != rhs[i]: break
i.inc
result.add "first mismatch index: " & $i & "\n"
if i < lhs.len and i < rhs.len:
result.add "lhs[i]: {" & quoted($lhs[i]) & "}\nrhs[i]: {" & quoted(
$rhs[i]) & "}\n"
result.add "lhs[0..<i]:{" & replaceInvisible($lhs[
0..<i]) & "}"
proc assertEquals*[T](lhs: T, rhs: T) =
when false: # can be useful for debugging to see all that's fed to this.
echo "----" & $lhs
if lhs!=rhs:
doAssert false, mismatch(lhs, rhs)
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