Run cargo build and test built binary to ensure it works (#246)

* Run cargo build and test built binary to ensure it works

* Moved the test from GitHub CI to a test in `src/main.rs`

* Moved `verify_binary_contains_lints` to `tests/`

Cargo.toml

@@ -37,3 +37,6 @@ bugreport = "0.5.0"
 itertools = "0.10.5"
 cargo_toml = "0.13.0"
 toml = "0.5.9"
+
+[dev-dependencies]
+assert_cmd = "2.0"

tests/verify_binary_contains_lints.rs

@@ -0,0 +1,31 @@
+use assert_cmd::Command;
+
+#[test]
+fn verify_binary_contains_lints() {
+    let assert_on_crate_pair = |crate_pair: &str| {
+        let mut cmd = Command::cargo_bin("cargo-semver-checks").unwrap();
+        cmd.current_dir(format!("test_crates/{crate_pair}/new"))
+            .args([
+                "semver-checks",
+                "check-release",
+                "--baseline-root=../old/Cargo.toml",
+            ])
+            .assert()
+    };
+
+    // The `template/new` and `template/old` are identical crates, so running cargo-semver-checks on
+    // them shouldn't report any issues.
+    assert_on_crate_pair("template").success();
+
+    // Those test crate pairs should trigger an error (because of a lint with the same name),
+    // so they should return a non-zero exit code.
+    // Only a few (arbitrarily) lints are being checked to speed up the testing process (the full
+    // list of lints is tested in `src/query.rs`).
+    for crate_pair in [
+        "enum_missing",
+        "function_const_removed",
+        "function_unsafe_added",
+    ] {
+        assert_on_crate_pair(crate_pair).failure();
+    }
+}