### if_true
# If with true condition
if true; then echo yes; fi
### expect
yes
### end

### if_false
# If with false condition
if false; then echo yes; fi
### expect
### end

### if_else
# If-else
if false; then echo yes; else echo no; fi
### expect
no
### end

### if_elif
# If-elif-else chain
if false; then echo one; elif true; then echo two; else echo three; fi
### expect
two
### end

### if_test_eq
# If with numeric equality
if [ 5 -eq 5 ]; then echo equal; fi
### expect
equal
### end

### if_test_ne
# If with numeric inequality
if [ 5 -ne 3 ]; then echo different; fi
### expect
different
### end

### if_test_gt
# If with greater than
if [ 5 -gt 3 ]; then echo bigger; fi
### expect
bigger
### end

### if_test_lt
# If with less than
if [ 3 -lt 5 ]; then echo smaller; fi
### expect
smaller
### end

### if_test_string_eq
# If with string equality
if [ foo = foo ]; then echo match; fi
### expect
match
### end

### if_test_string_ne
# If with string inequality
if [ foo != bar ]; then echo different; fi
### expect
different
### end

### if_test_z
# If with empty string test
if [ -z "" ]; then echo empty; fi
### expect
empty
### end

### if_test_n
# If with non-empty string test
if [ -n "hello" ]; then echo nonempty; fi
### expect
nonempty
### end

### for_simple
# Simple for loop
for i in a b c; do echo $i; done
### expect
a
b
c
### end

### for_numbers
# For loop with numbers
for i in 1 2 3; do echo $i; done
### expect
1
2
3
### end

### for_with_break
# For loop with break
for i in a b c; do echo $i; break; done
### expect
a
### end

### for_with_continue
# For loop with continue
for i in 1 2 3; do if [ $i -eq 2 ]; then continue; fi; echo $i; done
### expect
1
3
### end

### while_counter
# While loop with counter
i=0; while [ $i -lt 3 ]; do echo $i; i=$((i + 1)); done
### expect
0
1
2
### end

### while_false
# While with false condition
while false; do echo loop; done; echo done
### expect
done
### end

### while_break
# While with break
i=0; while [ $i -lt 10 ]; do echo $i; i=$((i + 1)); if [ $i -ge 3 ]; then break; fi; done
### expect
0
1
2
### end

### case_literal
# Case with literal match
case foo in foo) echo matched;; esac
### expect
matched
### end

### case_wildcard
# Case with wildcard
case bar in *) echo default;; esac
### expect
default
### end

### case_multiple
# Case with multiple patterns
case foo in bar|foo|baz) echo matched;; esac
### expect
matched
### end

### case_no_match
# Case with no match
case foo in bar) echo no;; esac
### expect
### end

### case_pattern
# Case with glob pattern
case hello in hel*) echo prefix;; esac
### expect
prefix
### end

### case_fallthrough
# Case ;& falls through to next body
case a in a) echo first ;& b) echo second ;; esac
### expect
first
second
### end

### case_fallthrough_chain
# Case ;& chains through multiple bodies
case a in a) echo one ;& b) echo two ;& c) echo three ;; esac
### expect
one
two
three
### end

### case_continue_matching
# Case ;;& continues checking remaining patterns
case "test" in t*) echo prefix ;;& *es*) echo middle ;; *z*) echo nope ;; esac
### expect
prefix
middle
### end

### case_continue_no_match
# Case ;;& skips non-matching subsequent patterns
case "hello" in h*) echo first ;;& *z*) echo nope ;; *lo) echo last ;; esac
### expect
first
last
### end

### case_fallthrough_no_match
# Case ;& falls through even if next pattern wouldn't match
case a in a) echo matched ;& z) echo fell_through ;; esac
### expect
matched
fell_through
### end

### case_fallthrough_preserves_break
# break inside ;& case arm must break enclosing loop immediately
i=0; while true; do echo loop; case a in a) break ;& b) echo wrong ;; esac; echo after; done; echo done
### expect
loop
done
### end

### case_fallthrough_preserves_return
# return inside ;& case arm must return from function immediately
f() { case a in a) echo start; return 7 ;& b) echo wrong ;; esac; echo after; }; f; echo rc=$?
### expect
start
rc=7
### end

### and_list_success
# AND list with success
true && echo yes
### expect
yes
### end

### and_list_failure
# AND list short-circuit
false && echo no
### exit_code: 1
### expect
### end

### or_list_success
# OR list short-circuit
true || echo no
### expect
### end

### or_list_failure
# OR list with failure
false || echo fallback
### expect
fallback
### end

### command_list
# Semicolon command list
echo one; echo two; echo three
### expect
one
two
three
### end

### subshell
# Subshell execution
(echo hello)
### expect
hello
### end

### subshell_redirect
# Subshell with output redirection
(echo redirected) > /tmp/subshell_out.txt && cat /tmp/subshell_out.txt
### expect
redirected
### end

### brace_group
# Brace group
{ echo hello; }
### expect
hello
### end

### arith_for_le
# C-style for loop with <= condition
for ((i=1; i<=3; i++)); do echo $i; done
### expect
1
2
3
### end

### arith_for_ge
# C-style for loop with >= (countdown)
for ((i=3; i>=1; i--)); do echo $i; done
### expect
3
2
1
### end

### trap_err
# trap ERR fires on non-zero exit
trap 'echo ERR' ERR; false; echo after
### expect
ERR
after
### end

### trap_err_not_on_success
# trap ERR does not fire on success
trap 'echo ERR' ERR; true; echo ok
### expect
ok
### end

### trap_err_non_recursive
# ERR trap failures must not recursively retrigger ERR
trap 'false; false' ERR; false; echo after
### expect
after
### end

### trap_multiple
# Multiple traps can coexist
trap 'echo BYE' EXIT; trap 'echo ERR' ERR; false; echo done
### expect
ERR
done
BYE
### end

### regex_match_basic
# [[ =~ ]] regex match returns correct exit code
[[ "hello123" =~ [0-9]+ ]]; echo $?
[[ "hello" =~ [0-9]+ ]]; echo $?
### expect
0
1
### end

### regex_match_bash_rematch
# BASH_REMATCH populated with capture groups
x="hello123world"
[[ "$x" =~ ([0-9]+) ]]
echo "${BASH_REMATCH[0]}"
echo "${BASH_REMATCH[1]}"
### expect
123
123
### end

### regex_match_multiple_groups
# Multiple capture groups in BASH_REMATCH
[[ "2024-01-15" =~ ^([0-9]{4})-([0-9]{2})-([0-9]{2})$ ]]
echo "${BASH_REMATCH[0]}"
echo "${BASH_REMATCH[1]}"
echo "${BASH_REMATCH[2]}"
echo "${BASH_REMATCH[3]}"
### expect
2024-01-15
2024
01
15
### end

### regex_match_nested_groups
# Nested capture groups
[[ "foo123bar" =~ (foo([0-9]+)bar) ]]
echo "${BASH_REMATCH[0]}"
echo "${BASH_REMATCH[1]}"
echo "${BASH_REMATCH[2]}"
### expect
foo123bar
foo123bar
123
### end

### regex_match_no_match_clears
# BASH_REMATCH cleared on no match
[[ "abc123" =~ ([0-9]+) ]]
echo "before: ${#BASH_REMATCH[@]}"
[[ "abc" =~ ([0-9]+) ]]
echo "after: ${#BASH_REMATCH[@]}"
### expect
before: 2
after: 0
### end

### while_read_input_redirect
# while read ... done < file
printf "a\nb\nc\n" > /tmp/wr_test
while read -r line; do echo "got: $line"; done < /tmp/wr_test
### expect
got: a
got: b
got: c
### end

### while_read_herestring
# while read ... done <<< string
while read -r line; do echo "line: $line"; done <<< "hello"
### expect
line: hello
### end

### while_read_heredoc
# while read ... done << EOF
while read -r line; do echo "$line"; done << EOF
alpha
beta
EOF
### expect
alpha
beta
### end

### while_read_sum
# Sum numbers from file redirect
printf "10\n20\n30\n" > /tmp/wr_sum
total=0
while read -r n; do total=$((total + n)); done < /tmp/wr_sum
echo $total
### expect
60
### end

### for_output_redirect
# for loop with output redirect
for i in a b c; do echo $i; done > /tmp/for_out
cat /tmp/for_out
### expect
a
b
c
### end

### regex_match_in_conditional
# Regex match used in && chain
x="error: line 42"
if [[ "$x" =~ error:\ line\ ([0-9]+) ]]; then
  echo "line ${BASH_REMATCH[1]}"
else
  echo "no match"
fi
### expect
line 42
### end

### select_basic
# select reads from stdin and sets variable
echo "2" | select item in alpha beta gamma; do echo "got: $item"; break; done
### expect
got: beta
### end

### select_reply
# select sets REPLY to raw input
echo "1" | select x in one two three; do echo "REPLY=$REPLY x=$x"; break; done
### expect
REPLY=1 x=one
### end

### select_invalid
# select with invalid number sets variable to empty
echo "9" | select x in a b c; do echo "x='$x' REPLY=$REPLY"; break; done
### expect
x='' REPLY=9
### end

### select_multiple_iterations
# select loops until break
printf "1\n2\n3\n" | select x in a b c; do echo "$x"; if [ "$REPLY" = "3" ]; then break; fi; done
### expect
a
b
c
### end

### select_eof_exits
# select exits on EOF (prints newline, exit code 1)
echo "1" | select x in a b; do echo "$x"; done
### exit_code: 1
### expect
a

### end

### arith_preincrement_and_break
# (( ++i > N )) && break should only break when expression is true
i=0
while true; do
  echo "iter $i"
  (( ++i > 3 )) && break
done
echo "done"
### expect
iter 0
iter 1
iter 2
iter 3
done
### end

### arith_predecrement_and_break
# (( --i < 0 )) && break should only break when expression is true
i=3
while true; do
  echo "iter $i"
  (( --i < 0 )) && break
done
echo "done"
### expect
iter 3
iter 2
iter 1
iter 0
done
### end