3 files changed, 617 insertions, 1 deletions
diff --git a/Cargo.lock b/Cargo.lock
index ab2a0bd..25252ed 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,6 +3,15 @@
 version = 4
 [[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+[[package]]
 name = "anstream"
 version = "0.6.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -59,6 +68,28 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e16d2d3311acee920a9eb8d33b8cbc1787ce4a264e85f964c2404b969bdcd487"
 [[package]]
+name = "assert_cmd"
+version = "2.0.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2bd389a4b2970a01282ee455294913c0a43724daedcd1a24c3eb0ec1c1320b66"
+dependencies = [
+ "anstyle",
+ "bstr",
+ "doc-comment",
+ "libc",
+ "predicates",
+ "predicates-core",
+ "predicates-tree",
+ "wait-timeout",
+]
+[[package]]
+name = "autocfg"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
+[[package]]
 name = "bitflags"
 version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -71,6 +102,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1b8e56985ec62d17e9c1001dc89c88ecd7dc08e47eba5ec7c29c7b5eeecde967"
 [[package]]
+name = "bstr"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "234113d19d0d7d613b40e86fb654acf958910802bcceab913a4f9e7cda03b1a4"
+dependencies = [
+ "memchr",
+ "regex-automata",
+ "serde",
+]
+[[package]]
 name = "cfg-if"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -143,15 +185,46 @@ name = "demon"
 version = "0.1.0"
 dependencies = [
 "anyhow",
+ "assert_cmd",
 "clap",
 "ctrlc",
 "glob",
 "notify",
+ "predicates",
+ "tempfile",
 "tracing",
 "tracing-subscriber",
 ]
 [[package]]
+name = "difflib"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6184e33543162437515c2e2b48714794e37845ec9851711914eec9d308f6ebe8"
+[[package]]
+name = "doc-comment"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fea41bba32d969b513997752735605054bc0dfa92b4c56bf1189f2e174be7a10"
+[[package]]
+name = "errno"
+version = "0.3.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cea14ef9355e3beab063703aa9dab15afd25f0667c341310c1e5274bb1d0da18"
+dependencies = [
+ "libc",
+ "windows-sys",
+]
+[[package]]
+name = "fastrand"
+version = "2.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
+[[package]]
 name = "filetime"
 version = "0.2.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -164,6 +237,15 @@ dependencies = [
 ]
 [[package]]
+name = "float-cmp"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b09cf3155332e944990140d967ff5eceb70df778b34f77d8075db46e4704e6d8"
+dependencies = [
+ "num-traits",
+]
+[[package]]
 name = "fsevent-sys"
 version = "4.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -173,6 +255,18 @@ dependencies = [
 ]
 [[package]]
+name = "getrandom"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26145e563e54f2cadc477553f1ec5ee650b00862f0a58bcd12cbdc5f0ea2d2f4"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "r-efi",
+ "wasi 0.14.2+wasi-0.2.4",
+]
+[[package]]
 name = "glob"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -254,12 +348,24 @@ dependencies = [
 ]
 [[package]]
+name = "linux-raw-sys"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cd945864f07fe9f5371a27ad7b52a172b4b499999f1d97574c9fa68373937e12"
+[[package]]
 name = "log"
 version = "0.4.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
 [[package]]
+name = "memchr"
+version = "2.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a282da65faaf38286cf3be983213fcf1d2e2a58700e808f83f4ea9a4804bc0"
+[[package]]
 name = "mio"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -267,7 +373,7 @@ checksum = "78bed444cc8a2160f01cbcf811ef18cac863ad68ae8ca62092e8db51d51c761c"
 dependencies = [
 "libc",
 "log",
- "wasi",
+ "wasi 0.11.1+wasi-snapshot-preview1",
 "windows-sys",
 ]
@@ -284,6 +390,12 @@ dependencies = [
 ]
 [[package]]
+name = "normalize-line-endings"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61807f77802ff30975e01f4f071c8ba10c022052f98b3294119f3e615d13e5be"
+[[package]]
 name = "notify"
 version = "8.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -319,6 +431,15 @@ dependencies = [
 ]
 [[package]]
+name = "num-traits"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
+dependencies = [
+ "autocfg",
+]
+[[package]]
 name = "once_cell"
 version = "1.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -343,6 +464,36 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3b3cff922bd51709b605d9ead9aa71031d81447142d828eb4a6eba76fe619f9b"
 [[package]]
+name = "predicates"
+version = "3.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5d19ee57562043d37e82899fade9a22ebab7be9cef5026b07fda9cdd4293573"
+dependencies = [
+ "anstyle",
+ "difflib",
+ "float-cmp",
+ "normalize-line-endings",
+ "predicates-core",
+ "regex",
+]
+[[package]]
+name = "predicates-core"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "727e462b119fe9c93fd0eb1429a5f7647394014cf3c04ab2c0350eeb09095ffa"
+[[package]]
+name = "predicates-tree"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72dd2d6d381dfb73a193c7fca536518d7caee39fc8503f74e7dc0be0531b425c"
+dependencies = [
+ "predicates-core",
+ "termtree",
+]
+[[package]]
 name = "proc-macro2"
 version = "1.0.95"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -361,6 +512,12 @@ dependencies = [
 ]
 [[package]]
+name = "r-efi"
+version = "5.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
+[[package]]
 name = "redox_syscall"
 version = "0.5.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -370,6 +527,48 @@ dependencies = [
 ]
 [[package]]
+name = "regex"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+[[package]]
+name = "regex-automata"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+[[package]]
+name = "regex-syntax"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
+[[package]]
+name = "rustix"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c71e83d6afe7ff64890ec6b71d6a69bb8a610ab78ce364b3352876bb4c801266"
+dependencies = [
+ "bitflags 2.9.1",
+ "errno",
+ "libc",
+ "linux-raw-sys",
+ "windows-sys",
+]
+[[package]]
 name = "same-file"
 version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -379,6 +578,26 @@ dependencies = [
 ]
 [[package]]
+name = "serde"
+version = "1.0.219"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f0e2c6ed6606019b4e29e69dbaba95b11854410e5347d525002456dbbb786b6"
+dependencies = [
+ "serde_derive",
+]
+[[package]]
+name = "serde_derive"
+version = "1.0.219"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b0276cf7f2c73365f7157c8123c21cd9a50fbbd844757af28ca1f5925fc2a00"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+[[package]]
 name = "sharded-slab"
 version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -411,6 +630,25 @@ dependencies = [
 ]
 [[package]]
+name = "tempfile"
+version = "3.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8a64e3985349f2441a1a9ef0b853f869006c3855f2cda6862a94d26ebb9d6a1"
+dependencies = [
+ "fastrand",
+ "getrandom",
+ "once_cell",
+ "rustix",
+ "windows-sys",
+]
+[[package]]
+name = "termtree"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f50febec83f5ee1df3015341d8bd429f2d1cc62bcba7ea2076759d315084683"
+[[package]]
 name = "thread_local"
 version = "1.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -495,6 +733,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ba73ea9cf16a25df0c8caa16c51acb937d5712a8429db78a3ee29d5dcacd3a65"
 [[package]]
+name = "wait-timeout"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ac3b126d3914f9849036f826e054cbabdc8519970b8998ddaf3b5bd3c65f11"
+dependencies = [
+ "libc",
+]
+[[package]]
 name = "walkdir"
 version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -511,6 +758,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
 [[package]]
+name = "wasi"
+version = "0.14.2+wasi-0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9683f9a5a998d873c0d21fcbe3c083009670149a8fab228644b8bd36b2c48cb3"
+dependencies = [
+ "wit-bindgen-rt",
+]
+[[package]]
 name = "winapi"
 version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -613,3 +869,12 @@ name = "windows_x86_64_msvc"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+[[package]]
+name = "wit-bindgen-rt"
+version = "0.39.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f42320e61fe2cfd34354ecb597f86f413484a798ba44a8ca1165c58d42da6c1"
+dependencies = [
+ "bitflags 2.9.1",
+]
diff --git a/Cargo.toml b/Cargo.toml
index f22a42a..ee3e226 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,3 +11,8 @@ glob = "0.3.2"
 notify = "8.0.0"
 tracing = "0.1.41"
 tracing-subscriber = "0.3.19"
+[dev-dependencies]
+assert_cmd = "2.0.17"
+predicates = "3.1.3"
+tempfile = "3.20.0"
diff --git a/tests/cli.rs b/tests/cli.rs
new file mode 100644
index 0000000..7cb68b7
--- /dev/null
+++ b/tests/cli.rs
@@ -0,0 +1,346 @@
+use assert_cmd::Command;
+use predicates::prelude::*;
+use std::fs;
+use std::time::Duration;
+use tempfile::TempDir;
+#[test]
+fn test_help_output() {
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.args(&["--help"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("daemon process management"))
+        .stdout(predicate::str::contains("run"))
+        .stdout(predicate::str::contains("stop"))
+        .stdout(predicate::str::contains("tail"))
+        .stdout(predicate::str::contains("cat"))
+        .stdout(predicate::str::contains("list"))
+        .stdout(predicate::str::contains("status"))
+        .stdout(predicate::str::contains("clean"));
+}
+#[test]
+fn test_version_output() {
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.args(&["--version"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("demon 0.1.0"));
+}
+#[test]
+fn test_run_missing_command() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["run", "--id", "test"])
+        .assert()
+        .failure()
+        .stderr(predicate::str::contains("Command cannot be empty"));
+}
+#[test]
+fn test_run_creates_files() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["run", "--id", "test", "echo", "hello"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("Started daemon 'test'"));
+    
+    // Verify files were created
+    assert!(temp_dir.path().join("test.pid").exists());
+    assert!(temp_dir.path().join("test.stdout").exists());
+    assert!(temp_dir.path().join("test.stderr").exists());
+    
+    // Check that stdout contains our output
+    let stdout_content = fs::read_to_string(temp_dir.path().join("test.stdout")).unwrap();
+    assert_eq!(stdout_content.trim(), "hello");
+}
+#[test]
+fn test_run_duplicate_process() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    // Start a long-running process
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["run", "--id", "long", "sleep", "30"])
+        .assert()
+        .success();
+    
+    // Try to start another with the same ID
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["run", "--id", "long", "sleep", "5"])
+        .assert()
+        .failure()
+        .stderr(predicate::str::contains("already running"));
+    
+    // Clean up the running process
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["stop", "--id", "long"])
+        .assert()
+        .success();
+}
+#[test]
+fn test_list_empty() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["list"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("ID"))
+        .stdout(predicate::str::contains("PID"))
+        .stdout(predicate::str::contains("STATUS"))
+        .stdout(predicate::str::contains("No daemon processes found"));
+}
+#[test]
+fn test_list_with_processes() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    // Start a process
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["run", "--id", "test", "echo", "done"])
+        .assert()
+        .success();
+    
+    // List processes
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["list"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("test"))
+        .stdout(predicate::str::contains("DEAD")); // Process should be finished by now
+}
+#[test]
+fn test_cat_output() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    // Create a process with output
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&[
+            "run", "--id", "test", "--",
+            "sh", "-c", "echo 'stdout line'; echo 'stderr line' >&2"
+        ])
+        .assert()
+        .success();
+    
+    // Cat the output
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["cat", "--id", "test"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("stdout line"))
+        .stdout(predicate::str::contains("stderr line"));
+}
+#[test]
+fn test_cat_stdout_only() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    // Create a process with output
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&[
+            "run", "--id", "test", "--",
+            "sh", "-c", "echo 'stdout line'; echo 'stderr line' >&2"
+        ])
+        .assert()
+        .success();
+    
+    // Cat only stdout
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["cat", "--id", "test", "--stdout"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("stdout line"))
+        .stdout(predicate::str::contains("stderr line").not());
+}
+#[test]
+fn test_status_nonexistent() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["status", "--id", "nonexistent"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("NOT FOUND"));
+}
+#[test]
+fn test_status_dead_process() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    // Create a short-lived process
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["run", "--id", "dead", "echo", "hello"])
+        .assert()
+        .success();
+    
+    // Check its status (should be dead)
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["status", "--id", "dead"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("DEAD"));
+}
+#[test]
+fn test_stop_nonexistent() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["stop", "--id", "nonexistent"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("not running"));
+}
+#[test]
+fn test_stop_process() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    // Start a long-running process
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["run", "--id", "long", "sleep", "10"])
+        .assert()
+        .success();
+    
+    // Stop it
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["stop", "--id", "long"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("terminated gracefully"));
+    
+    // Verify PID file is gone
+    assert!(!temp_dir.path().join("long.pid").exists());
+}
+#[test]
+fn test_clean_no_orphans() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["clean"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("No orphaned files found"));
+}
+#[test]
+fn test_clean_with_orphans() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    // Create a dead process
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["run", "--id", "dead", "echo", "hello"])
+        .assert()
+        .success();
+    
+    // Clean up orphaned files
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["clean"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("Cleaned up"))
+        .stdout(predicate::str::contains("orphaned"));
+    
+    // Verify files are gone
+    assert!(!temp_dir.path().join("dead.pid").exists());
+    assert!(!temp_dir.path().join("dead.stdout").exists());
+    assert!(!temp_dir.path().join("dead.stderr").exists());
+}
+#[test]
+fn test_run_with_complex_command() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&[
+            "run", "--id", "complex", "--",
+            "sh", "-c", "for i in 1 2 3; do echo \"line $i\"; done"
+        ])
+        .assert()
+        .success();
+    
+    // Give the process a moment to complete
+    std::thread::sleep(Duration::from_millis(100));
+    
+    // Check the output contains all lines
+    let stdout_content = fs::read_to_string(temp_dir.path().join("complex.stdout")).unwrap();
+    assert!(stdout_content.contains("line 1"));
+    assert!(stdout_content.contains("line 2"));
+    assert!(stdout_content.contains("line 3"));
+}
+#[test]
+fn test_timeout_configuration() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    // Start a process
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["run", "--id", "timeout-test", "sleep", "5"])
+        .assert()
+        .success();
+    
+    // Stop with custom timeout (should work normally since sleep responds to SIGTERM)
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["stop", "--id", "timeout-test", "--timeout", "2"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("terminated gracefully"));
+}
+#[test]
+fn test_invalid_process_id() {
+    let temp_dir = TempDir::new().unwrap();
+    
+    // Create an invalid PID file
+    fs::write(temp_dir.path().join("invalid.pid"), "not-a-number").unwrap();
+    
+    // Status should handle it gracefully
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["status", "--id", "invalid"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("ERROR"));
+    
+    // Clean should remove it
+    let mut cmd = Command::cargo_bin("demon").unwrap();
+    cmd.current_dir(temp_dir.path())
+        .args(&["clean"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("invalid PID file"));
+}
+\ No newline at end of file