This tool uses the go/ast package to rewrite the old t.Fatalf and t.Errorf testing formats to the new require and assert packages.
To run it on a particular file file_name.go, do ./fatal_rewriter file_name.go and ./error_rewriter file_name.go
I do not think if statements with initialization clauses can be rewritten in this way because of scope issues.
Comments sometimes get moved inside the new require or assert statements.
Combine the two commands into one.
Deal with more complicated if statements involving || and &&.