move contents of taskchampion repo to tc/

rust/cli/tests/cli.rs

@@ -0,0 +1,63 @@
+use assert_cmd::prelude::*;
+use predicates::prelude::*;
+use std::fs;
+use std::process::Command;
+use tempfile::TempDir;
+
+// NOTE: This tests that the `ta` binary is running and parsing arguments.  The details of
+// subcommands are handled with unit tests.
+
+/// These tests force config to be read via TASKCHAMPION_CONFIG so that a user's own config file
+/// (in their homedir) does not interfere with tests.
+fn test_cmd(dir: &TempDir) -> Result<Command, Box<dyn std::error::Error>> {
+    let config_filename = dir.path().join("config.toml");
+    fs::write(
+        config_filename.clone(),
+        format!("data_dir = {:?}", dir.path()),
+    )?;
+
+    let config_filename = config_filename.to_str().unwrap();
+    let mut cmd = Command::cargo_bin("ta")?;
+    cmd.env("TASKCHAMPION_CONFIG", config_filename);
+    Ok(cmd)
+}
+
+#[test]
+fn help() -> Result<(), Box<dyn std::error::Error>> {
+    let dir = TempDir::new().unwrap();
+    let mut cmd = test_cmd(&dir)?;
+
+    cmd.arg("--help");
+    cmd.assert()
+        .success()
+        .stdout(predicate::str::contains("Personal task-tracking"));
+
+    Ok(())
+}
+
+#[test]
+fn version() -> Result<(), Box<dyn std::error::Error>> {
+    let dir = TempDir::new().unwrap();
+    let mut cmd = test_cmd(&dir)?;
+
+    cmd.arg("--version");
+    cmd.assert()
+        .success()
+        .stdout(predicate::str::contains("TaskChampion"));
+
+    Ok(())
+}
+
+#[test]
+fn invalid_option() -> Result<(), Box<dyn std::error::Error>> {
+    let dir = TempDir::new().unwrap();
+    let mut cmd = test_cmd(&dir)?;
+
+    cmd.arg("--no-such-option");
+    cmd.assert()
+        .failure()
+        .stderr(predicate::str::contains("command line not recognized"))
+        .code(predicate::eq(3));
+
+    Ok(())
+}