use os.chdir(testing.temp_folder)! consistently in all `fn testsuit…

…e_begin() {}`

src/arch/arch_test.v

@@ -1,4 +1,5 @@
 import common.testing
+import os
 
 const util = 'arch'
 
@@ -12,6 +13,10 @@ const executable_under_test = testing.prepare_executable(util)
 
 const cmd = testing.new_paired_command(platform_util, executable_under_test)
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 fn test_help_and_version() {
 	cmd.ensure_help_and_version_options_work()!
 }

src/base64/base64_test.v

@@ -13,6 +13,10 @@ const executable_under_test = testing.prepare_executable(util)
 
 const cmd = testing.new_paired_command(platform_util, executable_under_test)
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 fn test_help_and_version() {
 	cmd.ensure_help_and_version_options_work()!
 }

src/cksum/cksum_test.v

@@ -27,6 +27,7 @@ fn test_help_and_version() {
 }
 
 fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
 	os.write_file(test1_txt_path, 'Hello World!\nHow are you?')!
 	os.write_file(test2_txt_path, 'a'.repeat(128 * 1024 + 5))!
 }

src/dirname/dirname_test.v

@@ -19,6 +19,10 @@ const executable_under_test = testing.prepare_executable(util)
 
 const cmd = testing.new_paired_command(platform_util, executable_under_test)
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 fn test_help_and_version() {
 	cmd.ensure_help_and_version_options_work()!
 }

src/expand/expand_test.v

@@ -18,6 +18,7 @@ const cmd = testing.new_paired_command(platform_util, executable_under_test)
 const test_txt_path = os.join_path(testing.temp_folder, 'test.txt')
 
 fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
 	mut f := os.open_file(test_txt_path, 'wb')!
 	for l in testtxtcontent {
 		f.writeln('${l}')!

src/expr/expr_test.v

@@ -133,6 +133,10 @@ const tests = [
 	r"'(' 2 a",
 ]
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 fn test_results() {
 	mut failed := []string{}
 	for test in tests {

src/factor/factor_test.v

@@ -13,6 +13,10 @@ const executable_under_test = testing.prepare_executable(util)
 
 const cmd = testing.new_paired_command(platform_util, executable_under_test)
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 fn test_help_and_version() {
 	cmd.ensure_help_and_version_options_work()!
 }

src/fold/fold_test.v

@@ -22,6 +22,7 @@ fn test_help_and_version() {
 }
 
 fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
 	mut f := os.open_file(test_txt_path, 'wb')!
 	for l in testtxtcontent {
 		f.writeln('${l}') or {}

src/head/head_test.v

@@ -18,6 +18,7 @@ const cmd = testing.new_paired_command(platform_util, executable_under_test)
 const test_txt_path = os.join_path(testing.temp_folder, 'test.txt')
 
 fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
 	mut f := os.open_file(test_txt_path, 'wb')!
 	for l in testtxtcontent {
 		f.writeln('${l}')!

src/mkdir/mkdir_test.v

@@ -13,6 +13,7 @@ const eol = testing.output_eol()
 const tfolder = os.join_path(os.temp_dir(), 'coreutils', 'mkdir_test')
 
 fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
 	eprintln('testsuite_begin, tfolder = ${tfolder}')
 	os.rmdir_all(tfolder) or {}
 	assert !os.is_dir(tfolder)

src/printenv/printenv_test.v

@@ -1,4 +1,5 @@
 import common.testing
+import os
 
 const util = 'printenv'
 
@@ -12,6 +13,10 @@ const executable_under_test = testing.prepare_executable(util)
 
 const cmd = testing.new_paired_command(platform_util, executable_under_test)
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 fn test_help_and_version() {
 	cmd.ensure_help_and_version_options_work()!
 }

src/shuf/shuf_test.v

@@ -7,6 +7,10 @@ const shuf = testing.prepare_executable('shuf')
 
 const test_txt_path = os.join_path(testing.temp_folder, 'test.txt')
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 fn test_echo() {
 	res := os.execute('${shuf} -e aa bb')
 	assert res.output == 'aa${eol}bb${eol}' || res.output == 'bb${eol}aa${eol}'

src/sleep/sleep_test.v

@@ -16,6 +16,10 @@ const cmd = testing.new_paired_command(platform_util, executable_under_test)
 
 const cmd_ns = 'sleep'
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 fn test_help_and_version() {
 	cmd.ensure_help_and_version_options_work()!
 }

src/uname/uname_test.v

@@ -1,4 +1,5 @@
 import common.testing
+import os
 
 const util = 'uname'
 
@@ -12,6 +13,10 @@ const executable_under_test = testing.prepare_executable(util)
 
 const cmd = testing.new_paired_command(platform_util, executable_under_test)
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 fn test_help_and_version() {
 	cmd.ensure_help_and_version_options_work()!
 }

src/uniq/uniq_test.v

@@ -90,6 +90,7 @@ fn test_posix_spec_case_4_zero_term() {
 }
 
 fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
 	os.write_file(posix_test_path_newline, posix_test_data.join('\n'))!
 	os.write_file(posix_test_path_zeroterm, posix_test_data.join('\0'))!
 	os.mkdir('foo')!

src/unlink/unlink_test.v

@@ -18,6 +18,10 @@ fn call_for_test(args string) os.Result {
 	return res
 }
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 // TODO: The following tests fail in a Windows environment; need to
 // investigate what gives.
 fn test_target_does_not_exist() {

src/uptime/uptime_test.v

@@ -1,4 +1,5 @@
 import common.testing
+import os
 
 const util = 'uptime'
 
@@ -14,6 +15,10 @@ const executable_under_test = if supported_platform {
 	''
 }
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 const cmd = testing.new_paired_command(util, executable_under_test)
 
 fn test_help_and_version() {

src/wc/wc_test.v

@@ -33,6 +33,7 @@ fn test_help_and_version() {
 }
 
 fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
 	os.write_file(test1_txt_path, 'Hello World!\nHow are you?')!
 	os.write_file(test2_txt_path, 'twolinesonebreak\nbreakline')!
 	os.write_file(test3_txt_path, 'twolinestwobreaks\nbreakline\n')!

src/whoami/whoami_test.v

@@ -1,4 +1,5 @@
 import common.testing
+import os
 
 const util = 'whoami'
 
@@ -12,6 +13,10 @@ const executable_under_test = testing.prepare_executable(util)
 
 const cmd = testing.new_paired_command(platform_util, executable_under_test)
 
+fn testsuite_begin() {
+	os.chdir(testing.temp_folder)!
+}
+
 fn test_help_and_version() {
 	cmd.ensure_help_and_version_options_work()!
 }