diff --git a/libexec/bats b/libexec/bats
index 06f8fab..e074747 100755
--- a/libexec/bats
+++ b/libexec/bats
@@ -26,35 +26,58 @@ help() {
   echo
 }
 
+BATS_READLINK=
+
 resolve_link() {
-  $(type -p greadlink readlink | head -1) "$1"
+  if [[ -z "$BATS_READLINK" ]]; then
+    if command -v 'greadlink' >/dev/null; then
+      BATS_READLINK='greadlink'
+    elif command -v 'readlink' >/dev/null; then
+      BATS_READLINK='readlink'
+    else
+      BATS_READLINK='true'
+    fi
+  fi
+  "$BATS_READLINK" "$1" || return 0
 }
 
 abs_dirname() {
-  local cwd="$(pwd)"
+  local cwd="$PWD"
   local path="$1"
 
   while [ -n "$path" ]; do
     cd "${path%/*}"
     local name="${path##*/}"
-    path="$(resolve_link "$name" || true)"
+    path="$(resolve_link "$name")"
   done
 
-  pwd
+  printf -v "$2" -- '%s' "$PWD"
   cd "$cwd"
 }
 
 expand_path() {
-  { cd "$(dirname "$1")" 2>/dev/null
-    local dirname="$PWD"
+  local path="${1%/}"
+  local dirname="${path%/*}"
+
+  if [[ "$dirname" == "$path" ]]; then
+    dirname="$PWD"
+  elif cd "$dirname" 2>/dev/null; then
+    dirname="$PWD"
     cd "$OLDPWD"
-    echo "$dirname/$(basename "$1")"
-  } || echo "$1"
+  else
+    printf '%s' "$path"
+    return
+  fi
+  printf -v "$2" '%s/%s' "$dirname" "${path##*/}"
 }
 
-BATS_LIBEXEC="$(abs_dirname "$0")"
-export BATS_PREFIX="$(abs_dirname "$BATS_LIBEXEC")"
-export BATS_CWD="$(abs_dirname .)"
+abs_dirname "$0" 'BATS_LIBEXEC'
+abs_dirname "$BATS_LIBEXEC" 'BATS_PREFIX'
+abs_dirname '.' 'BATS_CWD'
+
+export BATS_PREFIX
+export BATS_CWD
+export BATS_TEST_PATTERN='^ *@test +(.+) +\{ *(.*)$'
 export PATH="$BATS_LIBEXEC:$PATH"
 
 options=()
@@ -113,14 +136,16 @@ fi
 
 filenames=()
 for filename in "${arguments[@]}"; do
+  expand_path "$filename" 'filename'
+
   if [ -d "$filename" ]; then
     shopt -s nullglob
-    for suite_filename in "$(expand_path "$filename")"/*.bats; do
+    for suite_filename in "$filename"/*.bats; do
       filenames["${#filenames[@]}"]="$suite_filename"
     done
     shopt -u nullglob
   else
-    filenames["${#filenames[@]}"]="$(expand_path "$filename")"
+    filenames["${#filenames[@]}"]="$filename"
   fi
 done
 
@@ -130,13 +155,11 @@ else
   command="bats-exec-suite"
 fi
 
-if [ -n "$pretty" ]; then
+set -o pipefail execfail
+if [ -z "$pretty" ]; then
+  exec "$command" $count_flag "${filenames[@]}"
+else
   extended_syntax_flag="-x"
   formatter="bats-format-tap-stream"
-else
-  extended_syntax_flag=""
-  formatter="cat"
+  exec "$command" $count_flag $extended_syntax_flag "${filenames[@]}" | "$formatter"
 fi
-
-set -o pipefail execfail
-exec "$command" $count_flag $extended_syntax_flag "${filenames[@]}" | "$formatter"
diff --git a/libexec/bats-exec-suite b/libexec/bats-exec-suite
index 29ab255..96021bb 100755
--- a/libexec/bats-exec-suite
+++ b/libexec/bats-exec-suite
@@ -17,7 +17,11 @@ trap "kill 0; exit 1" int
 
 count=0
 for filename in "$@"; do
-  let count+="$(bats-exec-test -c "$filename")"
+  while IFS= read -r line; do
+    if [[ "$line" =~ $BATS_TEST_PATTERN ]]; then
+      let count+=1
+    fi
+  done <"$filename"
 done
 
 if [ -n "$count_only_flag" ]; then
diff --git a/libexec/bats-exec-test b/libexec/bats-exec-test
index bdce3c8..b27a941 100755
--- a/libexec/bats-exec-test
+++ b/libexec/bats-exec-test
@@ -26,7 +26,7 @@ else
   shift
 fi
 
-BATS_TEST_DIRNAME="$(dirname "$BATS_TEST_FILENAME")"
+BATS_TEST_DIRNAME="${BATS_TEST_FILENAME%/*}"
 BATS_TEST_NAMES=()
 
 load() {
@@ -39,10 +39,10 @@ load() {
     filename="$BATS_TEST_DIRNAME/${name}.bash"
   fi
 
-  [ -f "$filename" ] || {
+  if [[ ! -f "$filename" ]]; then
     echo "bats: $filename does not exist" >&2
     exit 1
-  }
+  fi
 
   source "${filename}"
 }
@@ -101,31 +101,33 @@ bats_capture_stack_trace() {
   local teardown_pattern=" teardown $BATS_TEST_SOURCE"
 
   local frame
-  local index=1
+  local i
 
-  while frame="$(caller "$index")"; do
+  for ((i=2; i != ${#FUNCNAME[@]}; ++i)); do
+    frame="${BASH_LINENO[$((i-1))]} ${FUNCNAME[$i]} ${BASH_SOURCE[$i]}"
     BATS_CURRENT_STACK_TRACE["${#BATS_CURRENT_STACK_TRACE[@]}"]="$frame"
     if [[ "$frame" = *"$test_pattern"     || \
           "$frame" = *"$setup_pattern"    || \
           "$frame" = *"$teardown_pattern" ]]; then
       break
-    else
-      let index+=1
     fi
   done
 
-  BATS_SOURCE="$(bats_frame_filename "${BATS_CURRENT_STACK_TRACE[0]}")"
-  BATS_LINENO="$(bats_frame_lineno "${BATS_CURRENT_STACK_TRACE[0]}")"
+  bats_frame_filename "${BATS_CURRENT_STACK_TRACE[0]}" 'BATS_SOURCE'
+  bats_frame_lineno "${BATS_CURRENT_STACK_TRACE[0]}" 'BATS_LINENO'
 }
 
 bats_print_stack_trace() {
   local frame
   local index=1
   local count="${#@}"
+  local filename
+  local lineno
 
   for frame in "$@"; do
-    local filename="$(bats_trim_filename "$(bats_frame_filename "$frame")")"
-    local lineno="$(bats_frame_lineno "$frame")"
+    bats_frame_filename "$frame" 'filename'
+    bats_trim_filename "$filename" 'filename'
+    bats_frame_lineno "$frame" 'lineno'
 
     if [ $index -eq 1 ]; then
       echo -n "# ("
@@ -133,7 +135,8 @@ bats_print_stack_trace() {
       echo -n "#  "
     fi
 
-    local fn="$(bats_frame_function "$frame")"
+    local fn
+    bats_frame_function "$frame" 'fn'
     if [ "$fn" != "$BATS_TEST_NAME" ]; then
       echo -n "from function \`$fn' "
     fi
@@ -151,12 +154,16 @@ bats_print_stack_trace() {
 bats_print_failed_command() {
   local frame="$1"
   local status="$2"
-  local filename="$(bats_frame_filename "$frame")"
-  local lineno="$(bats_frame_lineno "$frame")"
+  local filename
+  local lineno
+  local failed_line
+  local failed_command
 
-  local failed_line="$(bats_extract_line "$filename" "$lineno")"
-  local failed_command="$(bats_strip_string "$failed_line")"
-  echo -n "#   \`${failed_command}' "
+  bats_frame_filename "$frame" 'filename'
+  bats_frame_lineno "$frame" 'lineno'
+  bats_extract_line "$filename" "$lineno" 'failed_line'
+  bats_strip_string "$failed_line" 'failed_command'
+  printf '%s' "#   \`${failed_command}' "
 
   if [ $status -eq 1 ]; then
     echo "failed"
@@ -166,49 +173,46 @@ bats_print_failed_command() {
 }
 
 bats_frame_lineno() {
-  local frame="$1"
-  local lineno="${frame%% *}"
-  echo "$lineno"
+  printf -v "$2" '%s' "${1%% *}"
 }
 
 bats_frame_function() {
-  local frame="$1"
-  local rest="${frame#* }"
-  local fn="${rest%% *}"
-  echo "$fn"
+  local __bff_function="${1#* }"
+  printf -v "$2" '%s' "${__bff_function%% *}"
 }
 
 bats_frame_filename() {
-  local frame="$1"
-  local rest="${frame#* }"
-  local filename="${rest#* }"
+  local __bff_filename="${1#* }"
+  __bff_filename="${__bff_filename#* }"
 
-  if [ "$filename" = "$BATS_TEST_SOURCE" ]; then
-    echo "$BATS_TEST_FILENAME"
-  else
-    echo "$filename"
+  if [ "$__bff_filename" = "$BATS_TEST_SOURCE" ]; then
+    __bff_filename="$BATS_TEST_FILENAME"
   fi
+  printf -v "$2" '%s' "$__bff_filename"
 }
 
 bats_extract_line() {
-  local filename="$1"
-  local lineno="$2"
-  sed -n "${lineno}p" "$filename"
+  local __bats_extract_line_line
+  local __bats_extract_line_index='0'
+
+  while IFS= read -r __bats_extract_line_line; do
+    if [[ "$((++__bats_extract_line_index))" -eq "$2" ]]; then
+      printf -v "$3" '%s' "${__bats_extract_line_line%$'\r'}"
+      break
+    fi
+  done <"$1"
 }
 
 bats_strip_string() {
-  local string="$1"
-  printf "%s" "$string" | sed -e "s/^[ "$'\t'"]*//" -e "s/[ "$'\t'"]*$//"
+  [[ "$1" =~ ^[[:space:]]*(.*)[[:space:]]*$ ]]
+  printf -v "$2" '%s' "${BASH_REMATCH[1]}"
 }
 
 bats_trim_filename() {
-  local filename="$1"
-  local length="${#BATS_CWD}"
-
-  if [ "${filename:0:length+1}" = "${BATS_CWD}/" ]; then
-    echo "${filename:length+1}"
+  if [[ "$1" =~ ^${BATS_CWD}/ ]]; then
+    printf -v "$2" '%s' "${1#$BATS_CWD/}"
   else
-    echo "$filename"
+    printf -v "$2" '%s' "$1"
   fi
 }
 
@@ -289,7 +293,7 @@ bats_perform_tests() {
 
 bats_perform_test() {
   BATS_TEST_NAME="$1"
-  if [ "$(type -t "$BATS_TEST_NAME" || true)" = "function" ]; then
+  if declare -F "$BATS_TEST_NAME" >/dev/null; then
     BATS_TEST_NUMBER="$2"
     if [ -z "$BATS_TEST_NUMBER" ]; then
       echo "1..1"
@@ -322,7 +326,7 @@ BATS_OUT="${BATS_TMPNAME}.out"
 
 bats_preprocess_source() {
   BATS_TEST_SOURCE="${BATS_TMPNAME}.src"
-  { tr -d '\r' < "$BATS_TEST_FILENAME"; echo; } | bats-preprocess > "$BATS_TEST_SOURCE"
+  . bats-preprocess <<< "$(< "$BATS_TEST_FILENAME")"$'\n' > "$BATS_TEST_SOURCE"
   trap "bats_cleanup_preprocessed_source" err exit
   trap "bats_cleanup_preprocessed_source; exit 1" int
 }
diff --git a/libexec/bats-format-tap-stream b/libexec/bats-format-tap-stream
index 614768f..b13fe1f 100755
--- a/libexec/bats-format-tap-stream
+++ b/libexec/bats-format-tap-stream
@@ -65,9 +65,15 @@ log() {
 }
 
 summary() {
-  printf "\n%d test%s" "$count" "$(plural "$count")"
+  printf "\n%d test" "$count"
+  if [[ "$count" -ne '1' ]]; then
+    printf 's'
+  fi
 
-  printf ", %d failure%s" "$failures" "$(plural "$failures")"
+  printf ", %d failure" "$failures"
+  if [[ "$failures" -ne '1' ]]; then
+    printf 's'
+  fi
 
   if [ "$skipped" -gt 0 ]; then
     printf ", %d skipped" "$skipped"
@@ -79,7 +85,9 @@ summary() {
 printf_with_truncation() {
   local width="$1"
   shift
-  local string="$(printf "$@")"
+  local string
+
+  printf -v 'string' -- "$@"
 
   if [ "${#string}" -gt "$width" ]; then
     printf "%s..." "${string:0:$(( $width - 4 ))}"
@@ -105,18 +113,18 @@ advance() {
 
 set_color() {
   local color="$1"
-  local weight="$2"
-  printf "\x1B[%d;%dm" $(( 30 + $color )) "$( [ "$weight" = "bold" ] && echo 1 || echo 22 )"
+  local weight='22'
+
+  if [[ "$2" == 'bold' ]]; then
+    weight='1'
+  fi
+  printf "\x1B[%d;%dm" $(( 30 + $color )) "$weight"
 }
 
 clear_color() {
   printf "\x1B[0m"
 }
 
-plural() {
-  [ "$1" -eq 1 ] || echo "s"
-}
-
 _buffer=""
 
 buffer() {
diff --git a/libexec/bats-preprocess b/libexec/bats-preprocess
index 04297ed..8307b76 100755
--- a/libexec/bats-preprocess
+++ b/libexec/bats-preprocess
@@ -4,6 +4,7 @@ set -e
 encode_name() {
   local name="$1"
   local result="test_"
+  local hex_code
 
   if [[ ! "$name" =~ [^[:alnum:]\ _-] ]]; then
     name="${name//_/-5f}"
@@ -21,27 +22,28 @@ encode_name() {
       elif [[ "$char" =~ [[:alnum:]] ]]; then
         result+="$char"
       else
-        result+="$(printf -- "-%02x" \'"$char")"
+        printf -v 'hex_code' -- "-%02x" \'"$char"
+        result+="$hex_code"
       fi
     done
   fi
 
-  echo "$result"
+  printf -v "$2" '%s' "$result"
 }
 
 tests=()
 index=0
-pattern='^ *@test  *([^ ].*)  *\{ *(.*)$'
 
 while IFS= read -r line; do
+  line="${line//$'\r'}"
   let index+=1
-  if [[ "$line" =~ $pattern ]]; then
-    quoted_name="${BASH_REMATCH[1]}"
+  if [[ "$line" =~ $BATS_TEST_PATTERN ]]; then
+    name="${BASH_REMATCH[1]#[\'\"]}"
+    name="${name%[\'\"]}"
     body="${BASH_REMATCH[2]}"
-    name="$(eval echo "$quoted_name")"
-    encoded_name="$(encode_name "$name")"
+    encode_name "$name" 'encoded_name'
     tests["${#tests[@]}"]="$encoded_name"
-    echo "${encoded_name}() { bats_test_begin ${quoted_name} ${index}; ${body}"
+    echo "${encoded_name}() { bats_test_begin \"${name}\" ${index}; ${body}"
   else
     printf "%s\n" "$line"
   fi
diff --git a/test/bats.bats b/test/bats.bats
index 9fca64a..44b573c 100755
--- a/test/bats.bats
+++ b/test/bats.bats
@@ -41,25 +41,25 @@ fixtures bats
 }
 
 @test "summary passing tests" {
-  run filter_control_sequences bats -p $FIXTURE_ROOT/passing.bats
+  run filter_control_sequences bats -p "$FIXTURE_ROOT/passing.bats"
   [ $status -eq 0 ]
   [ "${lines[1]}" = "1 test, 0 failures" ]
 }
 
 @test "summary passing and skipping tests" {
-  run filter_control_sequences bats -p $FIXTURE_ROOT/passing_and_skipping.bats
+  run filter_control_sequences bats -p "$FIXTURE_ROOT/passing_and_skipping.bats"
   [ $status -eq 0 ]
   [ "${lines[2]}" = "2 tests, 0 failures, 1 skipped" ]
 }
 
 @test "summary passing and failing tests" {
-  run filter_control_sequences bats -p $FIXTURE_ROOT/failing_and_passing.bats
+  run filter_control_sequences bats -p "$FIXTURE_ROOT/failing_and_passing.bats"
   [ $status -eq 0 ]
   [ "${lines[4]}" = "2 tests, 1 failure" ]
 }
 
 @test "summary passing, failing and skipping tests" {
-  run filter_control_sequences bats -p $FIXTURE_ROOT/passing_failing_and_skipping.bats
+  run filter_control_sequences bats -p "$FIXTURE_ROOT/passing_failing_and_skipping.bats"
   [ $status -eq 0 ]
   [ "${lines[5]}" = "3 tests, 1 failure, 1 skipped" ]
 }
@@ -268,3 +268,17 @@ fixtures bats
   [ $status -eq 0 ]
   [ "${lines[1]}" = "ok 1 loop_func" ]
 }
+
+@test "expand variables in test name" {
+  SUITE='test/suite' run bats "$FIXTURE_ROOT/expand_var_in_test_name.bats"
+  [ $status -eq 0 ]
+  [ "${lines[1]}" = "ok 1 test/suite: test with variable in name" ]
+}
+
+@test "handle quoted and unquoted test names" {
+  run bats "$FIXTURE_ROOT/quoted_and_unquoted_test_names.bats"
+  [ $status -eq 0 ]
+  [ "${lines[1]}" = "ok 1 single-quoted name" ]
+  [ "${lines[2]}" = "ok 2 double-quoted name" ]
+  [ "${lines[3]}" = "ok 3 unquoted name" ]
+}
diff --git a/test/fixtures/bats/expand_var_in_test_name.bats b/test/fixtures/bats/expand_var_in_test_name.bats
new file mode 100644
index 0000000..8f6dec2
--- /dev/null
+++ b/test/fixtures/bats/expand_var_in_test_name.bats
@@ -0,0 +1,3 @@
+@test "$SUITE: test with variable in name" {
+  true
+}
diff --git a/test/fixtures/bats/quoted_and_unquoted_test_names.bats b/test/fixtures/bats/quoted_and_unquoted_test_names.bats
new file mode 100644
index 0000000..aa460da
--- /dev/null
+++ b/test/fixtures/bats/quoted_and_unquoted_test_names.bats
@@ -0,0 +1,11 @@
+@test 'single-quoted name' {
+  true
+}
+
+@test "double-quoted name" {
+  true
+}
+
+@test unquoted name {
+  true
+}
diff --git a/test/test_helper.bash b/test/test_helper.bash
index 84eee8c..302f743 100644
--- a/test/test_helper.bash
+++ b/test/test_helper.bash
@@ -1,6 +1,6 @@
 fixtures() {
   FIXTURE_ROOT="$BATS_TEST_DIRNAME/fixtures/$1"
-  RELATIVE_FIXTURE_ROOT="$(bats_trim_filename "$FIXTURE_ROOT")"
+  bats_trim_filename "$FIXTURE_ROOT" 'RELATIVE_FIXTURE_ROOT'
 }
 
 setup() {