fn alternate_registries()

in tools/hakari/src/toml_out.rs [526:567]
33 lines of code
2 McCabe index (conditional complexity)

    fn alternate_registries() {
        let fixture = JsonFixture::metadata_alternate_registries();
        let mut builder =
            HakariBuilder::new(fixture.graph(), None).expect("builder initialization succeeded");
        builder.set_output_single_feature(true);
        let hakari = builder.compute();

        // Not plugging in the registry should generate an error.
        let output_options = HakariOutputOptions::new();
        hakari
            .to_toml_string(&output_options)
            .expect_err("no alternate registry specified => error");

        let mut builder =
            HakariBuilder::new(fixture.graph(), None).expect("builder initialization succeeded");
        builder.set_output_single_feature(true);
        builder.add_registries([("alt-registry", METADATA_ALTERNATE_REGISTRY_URL)]);
        let hakari = builder.compute();

        let output = hakari
            .to_toml_string(&output_options)
            .expect("alternate registry specified => success");

        static MATCH_STRINGS: &[&str] = &[
            // Two copies of serde, one from the main registry and one from the alt
            r#"serde-e7e45184a9cd0878 = { package = "serde", version = "1", registry = "alt-registry", default-features = false, "#,
            r#"serde-dff4ba8e3ae991db = { package = "serde", version = "1", default-features = false, "#,
            // serde_derive only in the alt registry
            r#"serde_derive = { version = "1", registry = "alt-registry" }"#,
            // itoa only from the main registry
            r#"itoa = { version = "0.4", default-features = false }"#,
        ];

        for &needle in MATCH_STRINGS {
            assert!(
                output.contains(needle),
                "output did not contain string '{}', actual output follows:\n***\n{}\n",
                needle,
                output
            );
        }
    }