diff --git a/test/cases/plan9/exit.zig b/test/cases/plan9/exit.zig
new file mode 100644
index 0000000000..735818fb83
--- /dev/null
+++ b/test/cases/plan9/exit.zig
@@ -0,0 +1,5 @@
+pub fn main() void {}
+
+// run
+// target=x86_64-plan9,aarch64-plan9
+//
diff --git a/test/cases/plan9/hello_world_with_updates.0.zig b/test/cases/plan9/hello_world_with_updates.0.zig
new file mode 100644
index 0000000000..7e7c373251
--- /dev/null
+++ b/test/cases/plan9/hello_world_with_updates.0.zig
@@ -0,0 +1,28 @@
+pub fn main() void {
+    const str = "Hello World!\n";
+    asm volatile (
+        \\push $0
+        \\push %%r10
+        \\push %%r11
+        \\push $1
+        \\push $0
+        \\syscall
+        \\pop %%r11
+        \\pop %%r11
+        \\pop %%r11
+        \\pop %%r11
+        \\pop %%r11
+        :
+        // pwrite
+        : [syscall_number] "{rbp}" (51),
+          [hey] "{r11}" (@ptrToInt(str)),
+          [strlen] "{r10}" (str.len),
+        : "rcx", "rbp", "r11", "memory"
+    );
+}
+
+// run
+// target=x86_64-plan9
+//
+// Hello World
+//
diff --git a/test/cases/plan9/hello_world_with_updates.1.zig b/test/cases/plan9/hello_world_with_updates.1.zig
new file mode 100644
index 0000000000..4111a8dc08
--- /dev/null
+++ b/test/cases/plan9/hello_world_with_updates.1.zig
@@ -0,0 +1,10 @@
+const std = @import("std");
+pub fn main() void {
+    const str = "Hello World!\n";
+    _ = std.os.plan9.pwrite(1, str, str.len, 0);
+}
+
+// run
+//
+// Hello World
+//