diff --git a/Cargo.lock b/Cargo.lock
index ded163e..aa9c769 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -141,6 +141,15 @@ dependencies = [
  "synstructure",
 ]
 
+[[package]]
+name = "fastrand"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7a407cfaa3385c4ae6b23e84623d48c2798d06e3e6a1878f7f59f17b3f86499"
+dependencies = [
+ "instant",
+]
+
 [[package]]
 name = "gimli"
 version = "0.26.2"
@@ -181,6 +190,15 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "instant"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -298,6 +316,24 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "remove_dir_all"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3acd125665422973a33ac9d3dd2df85edad0f4ae9b00dafb1a05e43a9f5ef8e7"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.21"
@@ -386,6 +422,20 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "tempfile"
+version = "3.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5cdb1ef4eaeeaddc8fbd371e5017057064af0911902ef36b39801f67cc6d79e4"
+dependencies = [
+ "cfg-if",
+ "fastrand",
+ "libc",
+ "redox_syscall",
+ "remove_dir_all",
+ "winapi",
+]
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@@ -404,6 +454,7 @@ dependencies = [
  "serde",
  "serde_json",
  "structopt",
+ "tempfile",
  "toml_edit",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index 58eabb4..93ac301 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,3 +24,6 @@ serde = "1.0"
 serde_json = "1.0"
 structopt = "0.3"
 toml_edit = "0.15"
+
+[dev-dependencies]
+tempfile = "3.3.0"
diff --git a/test/test.rs b/test/test.rs
index f17eb54..1577ec9 100644
--- a/test/test.rs
+++ b/test/test.rs
@@ -1,11 +1,12 @@
 use std::env;
 use std::ffi::OsString;
+use std::fs;
 use std::path::PathBuf;
 use std::process;
 use std::str;
 
 #[test]
-fn help_if_no_args() {
+fn integration_test_help_if_no_args() {
     // Probably want to factor out much of this when adding more tests.
     let proc = process::Command::new(get_exec_path()).output().unwrap();
     assert!(!proc.status.success());
@@ -13,6 +14,74 @@ fn help_if_no_args() {
     assert!(stderr.contains("-h, --help"));
 }
 
+#[test]
+fn integration_test_cmd_get() {
+    let body = r#"[a]
+b = "c"
+[x]
+y = "z""#;
+    let toml_dir = tempfile::tempdir().expect("failed to create tempdir");
+    let toml_file = toml_dir.path().join("test.toml");
+    fs::write(&toml_file, body).expect("failed to write tempfile");
+    let toml_file = toml_file.as_os_str().to_str().unwrap();
+
+    let cmd = process::Command::new(get_exec_path())
+        .args(["get", toml_file, "x.y"])
+        .output()
+        .unwrap();
+    assert!(cmd.status.success());
+    let stdout = str::from_utf8(cmd.stdout.as_slice()).unwrap();
+    assert_eq!("\"z\"\n", stdout);
+
+    // x.z does not exists
+    let cmd = process::Command::new(get_exec_path())
+        .args(["get", toml_file, "x.z"])
+        .output()
+        .unwrap();
+    assert!(!cmd.status.success());
+}
+
+#[test]
+fn integration_test_cmd_set() {
+    // fn set(path: PathBuf, query: &str, value_str: &str, opts: SetOpts) -> Result<(), Error> {
+    let body = r#"[a]
+b = "c"
+[x]
+y = "z""#;
+    let toml_dir = tempfile::tempdir().expect("failed to create tempdir");
+    let toml_file = toml_dir.path().join("test.toml");
+    fs::write(&toml_file, body).expect("failed to write tempfile");
+    let toml_file = toml_file.as_os_str().to_str().unwrap();
+
+    // x.y exists
+    let cmd = process::Command::new(get_exec_path())
+        .args(["set", toml_file, "x.y", "new"])
+        .output()
+        .unwrap();
+    assert!(cmd.status.success());
+    let stdout = str::from_utf8(cmd.stdout.as_slice()).unwrap();
+    let excepted = r#"[a]
+b = "c"
+[x]
+y = "new"
+"#;
+    assert_eq!(excepted, stdout);
+
+    let cmd = process::Command::new(get_exec_path())
+        .args(["set", toml_file, "x.z", "123"])
+        .output()
+        .unwrap();
+    assert!(cmd.status.success());
+    let stdout = str::from_utf8(cmd.stdout.as_slice()).unwrap();
+    let excepted = r#"[a]
+b = "c"
+[x]
+y = "z"
+z = "123"
+"#;
+    assert_eq!(excepted, stdout);
+}
+
 fn get_exec_path() -> PathBuf {
     // TODO is there no cleaner way to get this from Cargo?
     // Also should it really be "debug"?