Make it work with alpine container

src/temp.bash

diff --git a/src/temp.bash b/src/temp.bash
index f7a9af0..d4d06ea 100755
--- a/src/temp.bash
+++ b/src/temp.bash
@@ -98,7 +98,7 @@
   local template="$prefix"
   template+="${BATS_TEST_FILENAME##*/}"
   template+="-${BATS_TEST_NUMBER}"
-  template+='-XXXXXXXXXX'
+  template+='-XXXXXX'
 
   local path
   if ! path="$(mktemp -d  --  "${BATS_TMPDIR}/${template}" 2>&1)"; then

test/58-assert-10-assert_equal_files.bats

diff --git a/test/58-assert-10-assert_equal_files.bats b/test/58-assert-10-assert_equal_files.bats
index 42b57cb..b391122 100644
--- a/test/58-assert-10-assert_equal_files.bats
+++ b/test/58-assert-10-assert_equal_files.bats
@@ -40,7 +40,8 @@
   run assert_files_equal "$file1" "$file2"
   [ "$status" -eq 1 ]
   [ "${#lines[@]}" -eq 5 ]
-  [ "${lines[0]}" == "cmp: ${TEST_FIXTURE_ROOT}/dir: Is a directory" ]
+  REGEX="cmp: ${TEST_FIXTURE_ROOT}/dir: (Is a directory|I/O error)"
+  [[ "${lines[0]}" =~ $REGEX ]] || false
   [ "${lines[1]}" == "-- files are not the same --" ]
   [ "${lines[2]}" == "path : $file1" ]
   [ "${lines[3]}" == "path : $file2" ]

test/58-assert-11-assert_not_equal_files.bats

diff --git a/test/58-assert-11-assert_not_equal_files.bats b/test/58-assert-11-assert_not_equal_files.bats
index cb758d9..f7e719f 100644
--- a/test/58-assert-11-assert_not_equal_files.bats
+++ b/test/58-assert-11-assert_not_equal_files.bats
@@ -39,7 +39,8 @@
   run assert_files_not_equal "$file1" "$file2"
   [ "$status" -eq 0 ]
   [ "${#lines[@]}" -eq 1 ]
-  [ "${lines[0]}" == "cmp: ${TEST_FIXTURE_ROOT}/dir: Is a directory" ]
+  REGEX="cmp: ${TEST_FIXTURE_ROOT}/dir: (Is a directory|I/O error)"
+  [[ "${lines[0]}" =~ $REGEX ]] || false
 }
 
 @test 'assert_files_not_equal() <file>: replace prefix of displayed path' {

test/70-temp-10-temp_make.bats

diff --git a/test/70-temp-10-temp_make.bats b/test/70-temp-10-temp_make.bats
index 06d24de..55ca8e9 100755
--- a/test/70-temp-10-temp_make.bats
+++ b/test/70-temp-10-temp_make.bats
@@ -9,9 +9,10 @@
   teardown() { rm -r -- "$TEST_TEMP_DIR"; }
 
   TEST_TEMP_DIR="$(temp_make)"
+  echo $TEST_TEMP_DIR
 
   local -r literal="${BATS_TMPDIR}/${BATS_TEST_FILENAME##*/}-"
-  local -r pattern='[1-9][0-9]*-.{10}'
+  local -r pattern='[1-9][0-9]*-.{6}'
   [[ $TEST_TEMP_DIR =~ ^"${literal}"${pattern}$ ]] || false
   [ -e "$TEST_TEMP_DIR" ]
 }
@@ -23,7 +24,8 @@
   [ "$status" -eq 1 ]
   [ "${#lines[@]}" -eq 3 ]
   [ "${lines[0]}" == '-- ERROR: temp_make --' ]
-  [[ ${lines[1]} == 'mktemp: failed to create directory via template'* ]]
+  REGEX="mktemp: (failed to create directory via template|\(null\): No such file or directory)"
+  [[ ${lines[1]} =~ $REGEX ]] || false
   [ "${lines[2]}" == '--' ]
 }
 
@@ -62,7 +64,7 @@
   TEST_TEMP_DIR="$(temp_make "$@" 'test-')"
 
   local -r literal="${BATS_TMPDIR}/test-${BATS_TEST_FILENAME##*/}-"
-  local -r pattern='[1-9][0-9]*-.{10}'
+  local -r pattern='[1-9][0-9]*-.{6}'
   [[ $TEST_TEMP_DIR =~ ^"${literal}"${pattern}$ ]] || false
   [ -e "$TEST_TEMP_DIR" ]
 }