Add assert_cmd and predicated to dev deps

Cargo.toml

@@ -3,11 +3,13 @@ name = "fakemall"
 version = "0.1.0"
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
 clap = { version = "4.1.4", features = ["derive"] }
 toml_edit = "0.19.0"
 toml = "0.7.0"
 serde = { version = "1.0.152", features = ["derive"] }
-anyhow = "1.0.68"
+anyhow = "1.0.68"
+
+[dev-dependencies]
+assert_cmd = "2.0.12"
+predicates = "3.0.4"

src/main.rs

@@ -7,7 +7,7 @@ use std::{
     fs::{self, File},
     io::{Read, Write},
     os::unix::prelude::PermissionsExt,
-    path::{PathBuf},
+    path::PathBuf,
     process,
 };
 /// A simple tool for building fake command line interfaces
@@ -49,7 +49,7 @@ fn main() -> Result<()> {
 
     match &cli.command {
         Commands::Exec { set, command } => exec(set, command.trim()),
-        Commands::Save {.. } => todo!(),
+        Commands::Save { .. } => todo!(),
         Commands::Build { set, path } => build(set, path),
     }
 }

tests/cli.rs

@@ -0,0 +1,41 @@
+use assert_cmd::prelude::*;
+use predicates::prelude::*;
+use std::process::Command;
+
+#[test]
+fn fakes_commands() -> Result<(), Box<dyn std::error::Error>> {
+    let mut cmd = Command::cargo_bin("fakemall")?;
+
+    cmd.arg("exec")
+        .arg("tests/test_config.toml")
+        .arg("dmidecode");
+    cmd.assert()
+        .success()
+        .stdout(predicate::str::contains("this is a sample output"));
+
+    Ok(())
+}
+
+#[test]
+fn set_doesnt_exist() -> Result<(), Box<dyn std::error::Error>> {
+    let mut cmd = Command::cargo_bin("fakemall")?;
+
+    cmd.arg("exec").arg("test/file/doesnt/exist").arg("kekw");
+    cmd.assert()
+        .failure()
+        .stderr(predicate::str::contains("No such file or directory"));
+
+    Ok(())
+}
+
+#[test]
+fn command_doesnt_exist() -> Result<(), Box<dyn std::error::Error>> {
+    let mut cmd = Command::cargo_bin("fakemall")?;
+
+    cmd.arg("exec").arg("tests/test_config.toml").arg("asdf");
+    cmd.assert()
+        .failure()
+        .stdout(predicate::str::contains("asdf: command not found"));
+
+    Ok(())
+}

tests/test_config.toml

@@ -0,0 +1,3 @@
+[[commands]]
+matches = "dmidecode"
+output = "this is a sample output"