stop using deprecated anonymous stdin behavior on test script

Author: dyegoaurelio

test/test.sh

@@ -35,7 +35,7 @@ verifyCorrect() {
   shift
 
   echo "Checking $file (${*:-no options}) …"
-  if ! out=$(nixfmt --strict --verify "$@" < "$file"); then
+  if ! out=$(nixfmt --strict --verify "$@" - < "$file"); then
     echo "[ERROR] failed nixfmt verification"
     exit 1
   fi
@@ -60,7 +60,7 @@ verifyCorrect test/correct-indent-4.nix --indent=4
 
 # Verify "invalid"
 for file in test/invalid/*.nix; do
-  if nixfmt < "$file" > /dev/null 2>&1; then
+  if nixfmt - < "$file" > /dev/null 2>&1; then
     echo "[ERROR] $file should have failed nixfmt"
     exit 1
   else
@@ -71,7 +71,7 @@ done
 # Verify "diff"
 for file in test/diff/**/in.nix; do
   echo "Checking $file …"
-  out="$(nixfmt --verify < "$file")"
+  out="$(nixfmt --verify - < "$file")"
   outfile="$(dirname "$file")/out.nix"
 
   if diff --color=always --unified "$outfile" <(echo "$out"); then
@@ -85,7 +85,7 @@ for file in test/diff/**/in.nix; do
   fi
 
   echo "Checking $file with --strict …"
-  out="$(nixfmt --strict --verify < "$file")"
+  out="$(nixfmt --strict --verify - < "$file")"
   outfile="$(dirname "$file")/out-pure.nix"
 
   if diff --color=always --unified "$outfile" <(echo "$out"); then