start moving cross-shell testing tests

and also make them more cross-shell test style

tests.old/Cross-shell test support/.test-TEST_SHELL-passed-through/$TEST_SHELL should be bash.

@@ -1,7 +0,0 @@
-#!/bin/sh
-
-# Assuming that urchin was invoked with `TEST_SHELL=bash urchin ...`, $TEST_SHELL should contain 'bash'.
-
-echo "\$TEST_SHELL: $TEST_SHELL"
-
-[ "$TEST_SHELL" = 'bash' ]

tests/Cross-shell testing/.special-shell

@@ -0,0 +1 @@
+/bin/sh

tests/Cross-shell testing/.test-TEST_SHELL-passed-through/$TEST_SHELL should be .special-shell.

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# Assuming that urchin was invoked with this,
+#
+#   TEST_SHELL=$PWD/.special-shell urchin ...
+# 
+# $TEST_SHELL should contain '.special-shell'
+
+echo "\$TEST_SHELL: $TEST_SHELL"
+
+[ "$(basename "$TEST_SHELL")" = '.special-shell' ]

tests/Cross-shell testing/.test-run-by-specified-shell/With -s, a sh test script should be invoked with the specified shell.

@@ -6,5 +6,4 @@ this_shell=$(ps -o comm= -p $$ && :)
 
 echo "Running shell: $this_shell"
 
-[  "$this_shell" = 'bash' ]
-
+[ "$(basename "$this_shell")" = '.special-shell' ]

tests/Cross-shell testing/.test-run-by-specified-shell/With -s, a shebang-less test script should be invoked with the specified shell.

@@ -6,5 +6,4 @@ this_shell=$(ps -o comm= -p $$ && :)
 
 echo "Running shell: $this_shell"
 
-[  "$this_shell" = 'bash' ]
-
+[ "$(basename "$this_shell")" = '.special-shell' ]

tests/Cross-shell testing/.test-run-by-specified-shell/With -s, the TEST_SHELL environment variable should be set to the specified shell too.

@@ -6,4 +6,4 @@ echo "Running shell: $(ps -o comm= -p $$ && :)"
 
 echo "\$TEST_SHELL: $TEST_SHELL"
 
-[  "$TEST_SHELL" = 'bash' ]
+[ "$(basename "$this_shell")" = '.special-shell' ]

tests/Cross-shell testing/Environment variable TEST_SHELL should be passed through.

@@ -3,7 +3,6 @@
 # Tests support for either passing through or defining a default value for environment variable TEST_SHELL.
 # (for test scripts that want to invoke shell scripts with a specified shell).
 
-which bash 2>/dev/null || { echo "Cannot test -s option: bash cannot be located." >&2; exit 1; }
-
 # Test if $TEST_SHELL, when placed in urchin's environment, is passed through to the test scripts.
-TEST_SHELL=bash ../../urchin ./.test-TEST_SHELL-passed-through
+TEST_SHELL="$PWD/.special-shell" $TEST_SHELL \
+  ../../urchin ./.test-TEST_SHELL-passed-through

tests/Cross-shell testing/Environment variable TEST_SHELL should default to sh if empty.

@@ -5,4 +5,5 @@
 
 # Test if $TEST_SHELL - if *defined, but empty* - is exported with value '/bin/sh' by urchin
 # and thus has that value inside the scripts.
-TEST_SHELL= ../../urchin ./.test-TEST_SHELL-undefined_or_empty
+TEST_SHELL="$PWD/.special-shell" $TEST_SHELL \
+  ../../urchin ./.test-TEST_SHELL-undefined_or_empty

tests/Cross-shell testing/Environment variable TEST_SHELL should default to sh if unset.

@@ -5,5 +5,7 @@
 
 # Test if $TEST_SHELL - if *undefined* - is exported with value '/bin/sh' by urchin
 # and thus has that value inside test scripts.
+
+s="$TEST_SHELL"
 unset -v TEST_SHELL
-../../urchin ./.test-TEST_SHELL-undefined_or_empty
+"$s" ../../urchin ./.test-TEST_SHELL-undefined_or_empty

tests/Cross-shell testing/The -s option should invoke tests with the specified shell.

@@ -1,7 +1,4 @@
 #!/bin/sh
 
 # Tests the `-s <shell> option, which invokes shebang-less and sh-shebang-line test scripts with the specified shell (for testing *sourced* shell code).
-
-which bash >/dev/null || { echo "Cannot test -s option: bash cannot be located." >&2; exit 2; }
-
-../../urchin -s bash ./.test-run-by-specified-shell
+../../urchin -s "$PWD/.special-shell" ./.test-run-by-specified-shell