assertThat(headers.values("foo")).containsExactly("bar", "baz", "bak")
    assertThat(headers.values("key")).containsExactly("value")
    assertThat(headers.values("ping")).containsExactly("pong")
    assertThat(headers.values("kit")).containsExactly("kat")
  }

  @Test fun addThrowsOnEmptyName() {
    assertFailsWith<IllegalArgumentException> {
      Headers.Builder().add(": bar")
    }
    assertFailsWith<IllegalArgumentException> {

- github.com/cncf/udpa/go: [269d4d4](https://github.com/cncf/udpa/tree/269d4d4)
- github.com/ghodss/yaml: [v1.0.0](https://github.com/ghodss/yaml/tree/v1.0.0)
- github.com/go-kit/kit: [v0.9.0](https://github.com/go-kit/kit/tree/v0.9.0)
- github.com/go-logfmt/logfmt: [v0.4.0](https://github.com/go-logfmt/logfmt/tree/v0.4.0)
- github.com/go-stack/stack: [v1.8.0](https://github.com/go-stack/stack/tree/v1.8.0)

- github.com/containerd/console: [v1.0.4](https://github.com/containerd/console/tree/v1.0.4)
- github.com/go-kit/log: [v0.2.1](https://github.com/go-kit/log/tree/v0.2.1)
- github.com/moby/sys/user: [v0.3.0](https://github.com/moby/sys/tree/user/v0.3.0)
- github.com/seccomp/libseccomp-golang: [v0.10.0](https://github.com/seccomp/libseccomp-golang/tree/v0.10.0)