Cli testing

Cargo.toml

@@ -109,4 +109,6 @@ encoding_rs = ">=0.8.0, <=0.8.29"
 
 [dev-dependencies]
 toml = "0.5"
-
+assert_cmd = "2"
+predicates = "2.1"
+tempdir = "0.3"

src/cli.rs

@@ -465,7 +465,7 @@ pub fn cli() -> Command {
 
             .arg(Arg::new("env")
                 .required(false)
-                .num_args(0)
+                .num_args(1)
                 .short('E')
                 .long("env")
                 .value_parser(ValueParser::new(env_pass_validator))

src/main.rs

@@ -33,7 +33,6 @@
     unused,
     unused_allocation,
     unused_comparisons,
-    unused_crate_dependencies,
     unused_extern_crates,
     unused_import_braces,
     unused_imports,

tests/cli.rs

@@ -0,0 +1,27 @@
+use std::process::Command;  // Run programs
+use assert_cmd::prelude::*; // Add methods on commands
+use predicates::prelude::*; // Used for writing assertions
+
+mod common;
+
+#[test]
+fn test_cli_build() -> Result<(), Box<dyn std::error::Error>> {
+    let tmpdir = tempdir::TempDir::new("butido")?;
+    common::setup_cwd(&tmpdir)?;
+    let mut cmd = Command::cargo_bin("butido")?;
+
+    cmd.current_dir(tmpdir.as_ref())
+        .arg("build")
+        .arg("example")
+        .arg("-I")
+        .arg("foo:bar")
+        .arg("example")
+        .arg("1.0.0");
+
+    // butido cannot do anything if there are no packages. So this should fail.
+    cmd.assert()
+        .failure()
+        .stderr(predicate::str::contains("No such file or directory"));
+
+    Ok(())
+}

tests/common.rs

@@ -0,0 +1,42 @@
+use std::path::Path;
+use assert_cmd::prelude::*; // Add methods on commands
+use predicates::prelude::*;
+
+const CONFIG: &str = include_str!("../config.toml");
+
+pub fn setup_cwd<P: AsRef<Path>>(path: P) -> Result<(), Box<dyn std::error::Error>> {
+    let mut toml: toml::Value = toml::from_str(CONFIG)?;
+
+    for (key, value) in [
+        ("releases_root", "releases"),
+        ("staging", "staging"),
+        ("source_cache", "sources"),
+        ("log_dir", "logs"),
+    ] {
+        let path = path.as_ref().join(value);
+        std::fs::create_dir(&path)?;
+        let value = toml::Value::String(path.display().to_string());
+        let toml_key = toml
+            .get_mut(key)
+            .ok_or_else(|| format!("{} missing in configuration", key))?;
+        *toml_key = value
+    }
+
+    std::fs::write(
+        path.as_ref().join("config.toml"),
+        toml::to_string_pretty(&toml)?,
+    )?;
+
+    std::fs::write(
+        path.as_ref().join("pkg.toml"),
+        ""
+    )?;
+
+    std::process::Command::new("git")
+        .current_dir(path)
+        .arg("init")
+        .assert()
+        .success();
+
+    Ok(())
+}