test(unit): add missing dependency on fixtures to help parallel testing

When running the test suite with xdist and 'pytest -n <jobs>', several
tests fail. This happens because, in these tests, the definition of the
tested command, usually in a fixture method called 'functions' might
happen only after the execution of the tests themselves, i.e. in the
methods whose names start with 'test_'.

This patch adds the missing dependency on these test-command-defining
fixtures, so that they are executed before the tests themselves.

Steps to reproduce:

1. Make sure pytest-xdist is installed. On Debian systems this can be
   verified with the following command:

     dpkg --list python3-pytest-xdist

2. Build and install bash-completion locally, for example with the
   following commands:

     autoreconf -f -i
     ./configure --prefix=$PWD/install/
     make install

3. Run the test suite with a few parallel jobs, such as with:

     export MYPATH=$PWD/install/share/bash-completion/bash_completion
     BASH_COMPLETION_TEST_BASH_COMPLETION=$MYPATH \
       pytest \
         -n 8 \
         test/t/unit/test_unit_count_args.py \
         test/t/unit/test_unit_dequote.py \
         test/t/unit/test_unit_get_first_arg.py \
         test/t/unit/test_unit_quote.py
     unset MYPATH

Before this patch, these tests fail with messages similar to:

  FAILED test/t/unit/test_unit_quote.py::TestUnitQuote::test_3 -
  AssertionError: Error running "__tester "  a "": exit status=127, output="

After this patch, all these tests, which previously failed, pass.

test/t/unit/test_unit_count_args.py

@@ -76,38 +76,38 @@ def test_9(self, bash, functions):
         )
         assert output == "3"
 
-    def test_10_single_hyphen_1(self, bash):
+    def test_10_single_hyphen_1(self, bash, functions):
         """- should be counted as an argument representing stdout/stdin"""
         output = self._test(bash, "(a -b - c -d e)", 5, "a -b - c -d e", 12)
         assert output == "3"
 
-    def test_10_single_hyphen_2(self, bash):
+    def test_10_single_hyphen_2(self, bash, functions):
         """- in an option argument should be skipped"""
         output = self._test(
             bash, "(a -b - c - e)", 5, "a -b - c - e", 11, arg='-a "-b"'
         )
         assert output == "3"
 
-    def test_11_double_hyphen_1(self, bash):
+    def test_11_double_hyphen_1(self, bash, functions):
         """all the words after -- should be counted"""
         output = self._test(
             bash, "(a -b -- -c -d e)", 5, "a -b -- -c -d e", 14
         )
         assert output == "3"
 
-    def test_11_double_hyphen_2(self, bash):
+    def test_11_double_hyphen_2(self, bash, functions):
         """all the words after -- should be counted"""
         output = self._test(bash, "(a b -- -c -d e)", 5, "a b -- -c -d e", 13)
         assert output == "4"
 
-    def test_12_exclude_optarg_1(self, bash):
+    def test_12_exclude_optarg_1(self, bash, functions):
         """an option argument should be skipped even if it matches the argument pattern"""
         output = self._test(
             bash, "(a -o -x b c)", 4, "a -o -x b c", 10, arg='-a "-o" -i "-x"'
         )
         assert output == "2"
 
-    def test_12_exclude_optarg_2(self, bash):
+    def test_12_exclude_optarg_2(self, bash, functions):
         """an option argument should be skipped even if it matches the argument pattern"""
         output = self._test(
             bash,
@@ -119,7 +119,7 @@ def test_12_exclude_optarg_2(self, bash):
         )
         assert output == "2"
 
-    def test_12_exclude_optarg_3(self, bash):
+    def test_12_exclude_optarg_3(self, bash, functions):
         """an option argument should be skipped even if it matches the argument pattern"""
         output = self._test(
             bash,
@@ -131,21 +131,21 @@ def test_12_exclude_optarg_3(self, bash):
         )
         assert output == "1"
 
-    def test_13_plus_option_optarg(self, bash):
+    def test_13_plus_option_optarg(self, bash, functions):
         """When +o is specified to be an option taking an option argument, it should not be counted as an argument"""
         output = self._test(
             bash, "(a +o b c)", 3, "a +o b c", 7, arg='-a "+o"'
         )
         assert output == "1"
 
-    def test_14_no_optarg_chain_1(self, bash):
+    def test_14_no_optarg_chain_1(self, bash, functions):
         """an option argument should not take another option argument"""
         output = self._test(
             bash, "(a -o -o -o -o c)", 5, "a -o -o -o -o c", 14, arg='-a "-o"'
         )
         assert output == "1"
 
-    def test_14_no_optarg_chain_2(self, bash):
+    def test_14_no_optarg_chain_2(self, bash, functions):
         """an option argument should not take another option argument"""
         output = self._test(
             bash,
@@ -157,14 +157,14 @@ def test_14_no_optarg_chain_2(self, bash):
         )
         assert output == "2"
 
-    def test_15_double_hyphen_optarg(self, bash):
+    def test_15_double_hyphen_optarg(self, bash, functions):
         """-- should lose its meaning when it is an option argument"""
         output = self._test(
             bash, "(a -o -- -b -c d)", 5, "a -o -- -b -c d", 14, arg='-a "-o"'
         )
         assert output == "1"
 
-    def test_16_empty_word(self, bash):
+    def test_16_empty_word(self, bash, functions):
         """An empty word should not take an option argument"""
         output = self._test(bash, "(a '' x '' y d)", 5, "a  x  y d", 8)
         assert output == "5"

test/t/unit/test_unit_dequote.py

@@ -9,123 +9,126 @@
     ignore_env=r"^\+declare -f __tester$",
 )
 class TestDequote:
-    def test_1_char(self, bash):
+    @pytest.fixture
+    def functions(self, bash):
         assert_bash_exec(
             bash,
             '__tester() { local REPLY=dummy v=var;_comp_dequote "$1";local ext=$?;((${#REPLY[@]}))&&printf \'<%s>\' "${REPLY[@]}";echo;return $ext;}',
         )
+
+    def test_1_char(self, bash, functions):
         output = assert_bash_exec(bash, "__tester a", want_output=True)
         assert output.strip() == "<a>"
 
-    def test_2_str(self, bash):
+    def test_2_str(self, bash, functions):
         output = assert_bash_exec(bash, "__tester abc", want_output=True)
         assert output.strip() == "<abc>"
 
-    def test_3_null(self, bash):
+    def test_3_null(self, bash, functions):
         output = assert_bash_exec(bash, "__tester ''", want_output=True)
         assert output.strip() == ""
 
-    def test_4_empty(self, bash):
+    def test_4_empty(self, bash, functions):
         output = assert_bash_exec(bash, "__tester \"''\"", want_output=True)
         assert output.strip() == "<>"
 
-    def test_5_brace(self, bash):
+    def test_5_brace(self, bash, functions):
         output = assert_bash_exec(bash, "__tester 'a{1..3}'", want_output=True)
         assert output.strip() == "<a1><a2><a3>"
 
-    def test_6_glob(self, bash):
+    def test_6_glob(self, bash, functions):
         output = assert_bash_exec(bash, "__tester 'a?b'", want_output=True)
         assert output.strip() == "<a b><a$b><a&b><a'b>"
 
-    def test_7_quote_1(self, bash):
+    def test_7_quote_1(self, bash, functions):
         output = assert_bash_exec(
             bash, "__tester '\"a\"'\\'b\\'\\$\\'c\\'", want_output=True
         )
         assert output.strip() == "<abc>"
 
-    def test_7_quote_2(self, bash):
+    def test_7_quote_2(self, bash, functions):
         output = assert_bash_exec(
             bash, "__tester '\\\"\\'\\''\\$\\`'", want_output=True
         )
         assert output.strip() == "<\"'$`>"
 
-    def test_7_quote_3(self, bash):
+    def test_7_quote_3(self, bash, functions):
         output = assert_bash_exec(
             bash, "__tester \\$\\'a\\\\tb\\'", want_output=True
         )
         assert output.strip() == "<a\tb>"
 
-    def test_7_quote_4(self, bash):
+    def test_7_quote_4(self, bash, functions):
         output = assert_bash_exec(
             bash, '__tester \'"abc\\"def"\'', want_output=True
         )
         assert output.strip() == '<abc"def>'
 
-    def test_7_quote_5(self, bash):
+    def test_7_quote_5(self, bash, functions):
         output = assert_bash_exec(
             bash, "__tester \\'abc\\'\\\\\\'\\'def\\'", want_output=True
         )
         assert output.strip() == "<abc'def>"
 
-    def test_8_param_1(self, bash):
+    def test_8_param_1(self, bash, functions):
         output = assert_bash_exec(bash, "__tester '$v'", want_output=True)
         assert output.strip() == "<var>"
 
-    def test_8_param_2(self, bash):
+    def test_8_param_2(self, bash, functions):
         output = assert_bash_exec(bash, "__tester '${v}'", want_output=True)
         assert output.strip() == "<var>"
 
-    def test_8_param_3(self, bash):
+    def test_8_param_3(self, bash, functions):
         output = assert_bash_exec(bash, "__tester '${#v}'", want_output=True)
         assert output.strip() == "<3>"
 
-    def test_8_param_4(self, bash):
+    def test_8_param_4(self, bash, functions):
         output = assert_bash_exec(bash, "__tester '${v[0]}'", want_output=True)
         assert output.strip() == "<var>"
 
-    def test_9_qparam_1(self, bash):
+    def test_9_qparam_1(self, bash, functions):
         output = assert_bash_exec(bash, "__tester '\"$v\"'", want_output=True)
         assert output.strip() == "<var>"
 
-    def test_9_qparam_2(self, bash):
+    def test_9_qparam_2(self, bash, functions):
         output = assert_bash_exec(
             bash, "__tester '\"${v[@]}\"'", want_output=True
         )
         assert output.strip() == "<var>"
 
-    def test_10_pparam_1(self, bash):
+    def test_10_pparam_1(self, bash, functions):
         output = assert_bash_exec(bash, "__tester '$?'", want_output=True)
         assert output.strip() == "<0>"
 
-    def test_10_pparam_2(self, bash):
+    def test_10_pparam_2(self, bash, functions):
         output = assert_bash_exec(bash, "__tester '${#1}'", want_output=True)
         assert output.strip() == "<5>"  # The string `${#1}` is five characters
 
-    def test_unsafe_1(self, bash):
+    def test_unsafe_1(self, bash, functions):
         output = assert_bash_exec(
             bash, "! __tester '$(echo hello >&2)'", want_output=True
         )
         assert output.strip() == ""
 
-    def test_unsafe_2(self, bash):
+    def test_unsafe_2(self, bash, functions):
         output = assert_bash_exec(
             bash, "! __tester '|echo hello >&2'", want_output=True
         )
         assert output.strip() == ""
 
-    def test_unsafe_3(self, bash):
+    def test_unsafe_3(self, bash, functions):
         output = assert_bash_exec(
             bash, "! __tester '>| important_file.txt'", want_output=True
         )
         assert output.strip() == ""
 
-    def test_unsafe_4(self, bash):
+    def test_unsafe_4(self, bash, functions):
         output = assert_bash_exec(
             bash, "! __tester '`echo hello >&2`'", want_output=True
         )
         assert output.strip() == ""
 
-    def test_glob_default(self, bash):
+    def test_glob_default(self, bash, functions):
         with bash_env_saved(bash) as bash_env:
             bash_env.shopt("failglob", False)
             bash_env.shopt("nullglob", False)
@@ -134,7 +137,7 @@ def test_glob_default(self, bash):
             )
             assert output.strip() == "<non-existent-*.txt>"
 
-    def test_glob_noglob(self, bash):
+    def test_glob_noglob(self, bash, functions):
         with bash_env_saved(bash) as bash_env:
             bash_env.set("noglob", True)
             output = assert_bash_exec(
@@ -144,15 +147,15 @@ def test_glob_noglob(self, bash):
             )
             assert output.strip() == "<non-existent-*.txt>"
 
-    def test_glob_failglob(self, bash):
+    def test_glob_failglob(self, bash, functions):
         with bash_env_saved(bash) as bash_env:
             bash_env.shopt("failglob", True)
             output = assert_bash_exec(
                 bash, "! __tester 'non-existent-*.txt'", want_output=True
             )
             assert output.strip() == ""
 
-    def test_glob_nullglob(self, bash):
+    def test_glob_nullglob(self, bash, functions):
         with bash_env_saved(bash) as bash_env:
             bash_env.shopt("failglob", False)
             bash_env.shopt("nullglob", True)

test/t/unit/test_unit_get_first_arg.py

@@ -69,22 +69,22 @@ def test_9_skip_optarg_2(self, bash, functions):
         output = self._test(bash, "(a -b --foo d e f)", 5, '-a "@(-c|--foo)"')
         assert output == "e"
 
-    def test_9_skip_optarg_3(self, bash):
+    def test_9_skip_optarg_3(self, bash, functions):
         output = self._test(bash, "(a -b - c d e)", 5, '-a "-b"')
         assert output == "c"
 
-    def test_9_skip_optarg_4(self, bash):
+    def test_9_skip_optarg_4(self, bash, functions):
         output = self._test(bash, "(a -b -c d e f)", 5, '-a "-[bc]"')
         assert output == "d"
 
-    def test_9_skip_optarg_5(self, bash):
+    def test_9_skip_optarg_5(self, bash, functions):
         output = self._test(bash, "(a +o b c d)", 4, '-a "+o"')
         assert output == "c"
 
-    def test_9_skip_optarg_6(self, bash):
+    def test_9_skip_optarg_6(self, bash, functions):
         output = self._test(bash, "(a -o -o -o -o b c)", 6, '-a "-o"')
         assert output == "b"
 
-    def test_9_skip_optarg_7(self, bash):
+    def test_9_skip_optarg_7(self, bash, functions):
         output = self._test(bash, "(a -o -- -b -c d e)", 6, '-a "-o"')
         assert output == "d"

test/t/unit/test_unit_quote.py

@@ -8,35 +8,38 @@
     ignore_env=r"^\+declare -f __tester$",
 )
 class TestUnitQuote(TestUnitBase):
-    def test_1(self, bash):
+    @pytest.fixture
+    def functions(self, bash):
         assert_bash_exec(
             bash,
             '__tester() { local REPLY; _comp_quote "$1"; printf %s "$REPLY"; }',
         )
+
+    def test_1(self, bash, functions):
         output = assert_bash_exec(
             bash, '__tester "a b"', want_output=True, want_newline=False
         )
         assert output.strip() == "'a b'"
 
-    def test_2(self, bash):
+    def test_2(self, bash, functions):
         output = assert_bash_exec(
             bash, '__tester "a  b"', want_output=True, want_newline=False
         )
         assert output.strip() == "'a  b'"
 
-    def test_3(self, bash):
+    def test_3(self, bash, functions):
         output = assert_bash_exec(
             bash, '__tester "  a "', want_output=True, want_newline=False
         )
         assert output.strip() == "'  a '"
 
-    def test_4(self, bash):
+    def test_4(self, bash, functions):
         output = assert_bash_exec(
             bash, "__tester \"a'b'c\"", want_output=True, want_newline=False
         )
         assert output.strip() == r"'a'\''b'\''c'"
 
-    def test_5(self, bash):
+    def test_5(self, bash, functions):
         output = assert_bash_exec(
             bash, '__tester "a\'"', want_output=True, want_newline=False
         )