Here is a simple shell script you can customize to run a single test:
$ cat one_test.sh

#!/bin/bash
batsdir=$(dirname $(readlink -f bats))
echo $batsdir
export PATH=$batsdir:$PATH

in=$1
a_test=$2

if [[ ! -e "$in" ]]
then
  echo "not found: '$in'"
  exit 2
fi

out=$(mktemp)
bats-preprocess < $in > $out

if [[ -z "$a_test" ]] || ! grep -q "^$a_test" $out
then
  echo "test '$a_test' not found in $in"
  echo "available test are:"
  grep -o -E '^test_[^ ]+' $out
  exit 1
fi

echo "temp_file: $out"
export BATS_TEST_SOURCE=$out
bats-exec-test $in $a_test

As you can see bats as already almost all for that, but you need to preprocess the file yourself, and pass the filename via export BATS_TEST_SOURCE

Not extensively tested…

list test available:

$ ./one_test.sh bats-preprocess.bats 
/home/sylvain/code/bats/test/internal
test '' not found in bats-preprocess.bats
available test are:
test_preprocess_myself()
test_dummy_test()

run one by its encoded name

$ ./one_test.sh bats-preprocess.bats test_dummy_test
/home/sylvain/code/bats/test/internal
temp_file: /tmp/tmp.qJ5hM2Rl0O
1..1
ok 1 dummy test

enjoy.

Run a single test by name #36

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