add logos crate.

tests/cli.rs

@@ -0,0 +1,27 @@
+use assert_cmd::prelude::*; // Add methods on commands
+use predicates::prelude::*; // Used for writing assertions
+use std::process::Command; // Run programs
+
+#[test]
+fn file_doesnt_exist() -> Result<(), Box<dyn std::error::Error>> {
+    let mut cmd = Command::cargo_bin("mox")?;
+
+    cmd.arg("scan").arg("--file").arg("test.moxy");
+    cmd.assert()
+        .failure()
+        .stderr(predicate::str::contains("No such file or directory"));
+
+    Ok(())
+}
+
+#[test]
+fn scan_file_succeeds() -> Result<(), Box<dyn std::error::Error>> {
+    let mut cmd = Command::cargo_bin("mox")?;
+
+    cmd.arg("scan").arg("--file").arg("test.mox");
+    cmd.assert().success().stdout(predicate::str::contains(
+        "1:0   TokenFalse           \"no\"",
+    ));
+
+    Ok(())
+}