1 files changed, 62 insertions, 0 deletions
diff --git a/tests/cli.rs b/tests/cli.rs
new file mode 100644
index 0000000..4d54a55
--- /dev/null
+++ b/tests/cli.rs
@@ -0,0 +1,62 @@
+//! Command-line contract. Everything here runs offline: real lookups are
+//! tested against the fixtures in the unit tests.
+
+use assert_cmd::Command;
+use predicates::prelude::PredicateBooleanExt;
+use predicates::str::contains;
+
+fn drae() -> Command {
+    let mut c = Command::cargo_bin("drae").unwrap();
+    // A separate cache, so the user's is neither touched nor relied upon.
+    c.env("XDG_CACHE_HOME", env!("CARGO_TARGET_TMPDIR"));
+    c.env("NO_COLOR", "1");
+    c
+}
+
+#[test]
+fn prints_help_without_arguments() {
+    drae()
+        .assert()
+        .success()
+        .stdout(contains("Diccionario de la lengua española"))
+        .stdout(contains("conjugar"));
+}
+
+#[test]
+fn reports_its_version() {
+    drae()
+        .arg("--version")
+        .assert()
+        .success()
+        .stdout(contains(env!("CARGO_PKG_VERSION")));
+}
+
+#[test]
+fn search_needs_the_cache() {
+    drae()
+        .args(["buscar", "edificio", "--sin-cache"])
+        .assert()
+        .failure()
+        .stderr(contains("está desactivada"));
+}
+
+#[test]
+fn cache_commands_work_on_an_empty_cache() {
+    drae().args(["cache", "info"]).assert().success();
+    drae()
+        .args(["cache", "listar"])
+        .assert()
+        .success()
+        .stdout(contains("vacía").or(contains("rae-api")));
+}
+
+#[test]
+fn definir_exists_for_words_that_clash_with_command_names() {
+    // `drae sin` is the synonyms command, so the word «sin» is looked up
+    // with `drae definir sin`.
+    drae()
+        .args(["definir", "--help"])
+        .assert()
+        .success()
+        .stdout(contains("PALABRA"));
+}