Added tests for sed (#110)

Author: vidyalakshmir

sed/run_sed_tests.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+set -uo pipefail
+
+LIND_WASM_ROOT="${LIND_WASM_ROOT:-/home/lind/lind-wasm}"
+LINDBOOT_BIN="$LIND_WASM_ROOT/build/lind-boot"
+LINDFS_ROOT="$LIND_WASM_ROOT/lindfs"
+
+cd $LINDFS_ROOT
+
+echo "Starting sed sandbox tests..."
+
+FAILS=0
+
+# Helper function to validate outputs
+check_result() {
+    local test_name="$1"
+    local expected="$2"
+    local actual="$3"
+
+    if [ "$expected" = "$actual" ]; then
+        echo "[PASS] $test_name"
+    else
+        echo "[FAIL] $test_name"
+        echo "  Expected: '$expected'"
+        echo "  Actual:   '$actual'"
+        FAILS=$((FAILS + 1))
+    fi
+}
+
+# 1. Basic Stream Substitution
+ACTUAL=$(echo "Hello World" | lind_run bin/sed 's/World/Sandbox/')
+check_result "Basic Substitution" "Hello Sandbox" "$ACTUAL"
+
+# 2. Global Substitution
+ACTUAL=$(echo "apple banana apple" | lind_run bin/sed 's/a[a-z]*e/orange/g')
+check_result "Global Substitution" "orange banana orange" "$ACTUAL"
+
+# 3. In-Place File Editing (-i)
+# This heavily stresses file-related system calls (open, read, write, rename, unlink)
+echo "Version 1.0" > test_inplace.txt
+lind_run bin/sed -i 's/1.0/2.0/' test_inplace.txt
+ACTUAL=$(cat test_inplace.txt)
+check_result "In-Place Editing" "Version 2.0" "$ACTUAL"
+rm -f test_inplace.txt
+
+# 4. Line Deletion
+ACTUAL=$(printf "keep me\ndelete me\nkeep me too\n" | lind_run bin/sed '/delete/d')
+EXPECTED=$(printf "keep me\nkeep me too")
+check_result "Line Deletion" "$EXPECTED" "$ACTUAL"
+
+# 5. Selective Printing (-n)
+ACTUAL=$(printf "apple\nbanana\ncherry\n" | lind_run bin/sed -n '/banana/p')
+check_result "Selective Printing" "banana" "$ACTUAL"
+
+# 6. Multiple Commands (-e)
+ACTUAL=$(echo "foo and bar" | lind_run bin/sed -e 's/foo/baz/' -e 's/bar/qux/')
+check_result "Multiple Commands" "baz and qux" "$ACTUAL"
+
+# 7. Reading Commands from a Script (-f)
+echo "s/cat/dog/g" > script.sed
+ACTUAL=$(echo "The cat chased the other cat." | lind_run bin/sed -f script.sed)
+check_result "Script File" "The dog chased the other dog." "$ACTUAL"
+rm -f script.sed
+
+echo "-----------------------------------"
+if [ $FAILS -eq 0 ]; then
+    echo "Success: All sed tests passed!"
+    exit 0
+else
+    echo "Failure: $FAILS test(s) failed."
+    exit 1
+fi