7 files changed, 56 insertions, 0 deletions
diff --git a/bin/sh/tests/parser/Makefile b/bin/sh/tests/parser/Makefile
index afeb604710e4..c22af5414526 100644
--- a/bin/sh/tests/parser/Makefile
+++ b/bin/sh/tests/parser/Makefile
@@ -86,6 +86,12 @@ ${PACKAGE}FILES+=	only-redir2.0
 ${PACKAGE}FILES+=	only-redir3.0
 ${PACKAGE}FILES+=	only-redir4.0
 ${PACKAGE}FILES+=	pipe-not1.0
+${PACKAGE}FILES+=	ps1-expand1.0
+${PACKAGE}FILES+=	ps1-expand2.0
+${PACKAGE}FILES+=	ps1-expand3.0
+${PACKAGE}FILES+=	ps1-expand4.0
+${PACKAGE}FILES+=	ps1-expand5.0
+${PACKAGE}FILES+=	ps2-expand1.0
 ${PACKAGE}FILES+=	set-v1.0 set-v1.0.stderr
 ${PACKAGE}FILES+=	var-assign1.0
 
diff --git a/bin/sh/tests/parser/ps1-expand1.0 b/bin/sh/tests/parser/ps1-expand1.0
new file mode 100644
index 000000000000..351e6437a023
--- /dev/null
+++ b/bin/sh/tests/parser/ps1-expand1.0
@@ -0,0 +1,7 @@
+# Test simple variable expansion in PS1
+testvar=abcdef
+output=$(testvar=abcdef PS1='$testvar:' ENV=/dev/null ${SH} +m -i </dev/null 2>&1)
+case $output in
+*abcdef*) exit 0 ;;
+*) echo "Expected 'abcdef' in prompt output"; exit 1 ;;
+esac
diff --git a/bin/sh/tests/parser/ps1-expand2.0 b/bin/sh/tests/parser/ps1-expand2.0
new file mode 100644
index 000000000000..ed31a7c17136
--- /dev/null
+++ b/bin/sh/tests/parser/ps1-expand2.0
@@ -0,0 +1,7 @@
+# Test braced variable expansion in PS1
+testvar=xyz123
+output=$(testvar=xyz123 PS1='prefix-${testvar}-suffix:' ENV=/dev/null ${SH} +m -i </dev/null 2>&1)
+case $output in
+*xyz123*) exit 0 ;;
+*) echo "Expected 'xyz123' in prompt output"; exit 1 ;;
+esac
diff --git a/bin/sh/tests/parser/ps1-expand3.0 b/bin/sh/tests/parser/ps1-expand3.0
new file mode 100644
index 000000000000..0b6270c300ff
--- /dev/null
+++ b/bin/sh/tests/parser/ps1-expand3.0
@@ -0,0 +1,8 @@
+# Test special parameter $$ (PID) in PS1
+output=$(PS1='pid:$$:' ENV=/dev/null ${SH} +m -i </dev/null 2>&1)
+# Check that output contains "pid:" followed by a number (not literal $$)
+case $output in
+*pid:\$\$:*) echo "PID not expanded, got literal \$\$"; exit 1 ;;
+*pid:[0-9]*) exit 0 ;;
+*) echo "Expected PID after 'pid:' in output"; exit 1 ;;
+esac
diff --git a/bin/sh/tests/parser/ps1-expand4.0 b/bin/sh/tests/parser/ps1-expand4.0
new file mode 100644
index 000000000000..623c52707eec
--- /dev/null
+++ b/bin/sh/tests/parser/ps1-expand4.0
@@ -0,0 +1,8 @@
+# Test special parameter $? (exit status) in PS1
+output=$(PS1='status:$?:' ENV=/dev/null ${SH} +m -i </dev/null 2>&1)
+# Should start with exit status 0
+case $output in
+*status:\$?:*) echo "Exit status not expanded, got literal \$?"; exit 1 ;;
+*status:0:*) exit 0 ;;
+*) echo "Expected 'status:0:' in initial prompt"; exit 1 ;;
+esac
diff --git a/bin/sh/tests/parser/ps1-expand5.0 b/bin/sh/tests/parser/ps1-expand5.0
new file mode 100644
index 000000000000..73fe3ba5a3d5
--- /dev/null
+++ b/bin/sh/tests/parser/ps1-expand5.0
@@ -0,0 +1,8 @@
+# Test positional parameter $0 in PS1
+output=$(PS1='shell:$0:' ENV=/dev/null ${SH} +m -i </dev/null 2>&1)
+# $0 should contain the shell name/path
+case $output in
+*shell:\$0:*) echo "Positional parameter not expanded, got literal \$0"; exit 1 ;;
+*shell:*sh*:*) exit 0 ;;
+*) echo "Expected shell name after 'shell:' in output"; exit 1 ;;
+esac
diff --git a/bin/sh/tests/parser/ps2-expand1.0 b/bin/sh/tests/parser/ps2-expand1.0
new file mode 100644
index 000000000000..f0a3a77ded1c
--- /dev/null
+++ b/bin/sh/tests/parser/ps2-expand1.0
@@ -0,0 +1,12 @@
+# Test variable expansion in PS2 (continuation prompt)
+testvar=continue
+# Send incomplete command (backslash at end) to trigger PS2
+output=$(testvar=continue PS2='$testvar>' ENV=/dev/null ${SH} +m -i <<EOF 2>&1
+echo \\
+done
+EOF
+)
+case $output in
+*continue\>*) exit 0 ;;
+*) echo "Expected 'continue>' in PS2 output"; exit 1 ;;
+esac