test(cli): add end-to-end integration tests for CLI commands

Add 23 integration tests using assert_cmd and predicates covering
about, validate, show, licenses, install, config, init, and
dump-autoload commands with shared test helpers and fixture projects.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/crates/mozart/tests/cli_show.rs b/crates/mozart/tests/cli_show.rs
new file mode 100644
index 0000000..0ecb588
--- /dev/null
+++ b/crates/mozart/tests/cli_show.rs
@@ -0,0 +1,65 @@
+mod common;
+
+use predicates::str::contains;
+
+#[test]
+fn test_show_locked_packages() {
+    let project = common::copy_fixture_to_temp("with_lock");
+    common::mozart_cmd()
+        .arg("show")
+        .arg("--locked")
+        .arg("--working-dir")
+        .arg(project.path())
+        .assert()
+        .success()
+        .stdout(contains("psr/log"));
+}
+
+#[test]
+fn test_show_self() {
+    let project = common::copy_fixture_to_temp("with_lock");
+    common::mozart_cmd()
+        .arg("show")
+        .arg("--self-info")
+        .arg("--working-dir")
+        .arg(project.path())
+        .assert()
+        .success()
+        .stdout(contains("test/locked-project"));
+}
+
+#[test]
+fn test_show_name_only() {
+    let project = common::copy_fixture_to_temp("with_lock");
+    common::mozart_cmd()
+        .arg("show")
+        .arg("--name-only")
+        .arg("--locked")
+        .arg("--working-dir")
+        .arg(project.path())
+        .assert()
+        .success()
+        .stdout(contains("psr/log"));
+}
+
+#[test]
+fn test_show_format_json() {
+    let project = common::copy_fixture_to_temp("with_lock");
+    let output = common::mozart_cmd()
+        .arg("show")
+        .arg("--format=json")
+        .arg("--locked")
+        .arg("--working-dir")
+        .arg(project.path())
+        .assert()
+        .success()
+        .get_output()
+        .stdout
+        .clone();
+
+    let stdout = String::from_utf8_lossy(&output);
+    // Output should be parseable JSON
+    let parsed: serde_json::Value =
+        serde_json::from_str(&stdout).expect("show --format=json output should be valid JSON");
+    assert!(parsed.is_array() || parsed.is_object());
+}