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/fsnotify/fsnotify: [v1.4.7 → v1.4.9](https://github.com/fsnotify/fsnotify/compare/v1.4.7...v1.4.9)
- github.com/go-kit/kit: [v0.8.0 → v0.9.0](https://github.com/go-kit/kit/compare/v0.8.0...v0.9.0)
- github.com/go-logfmt/logfmt: [v0.3.0 → v0.4.0](https://github.com/go-logfmt/logfmt/compare/v0.3.0...v0.4.0)

- 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/etcd-io/gofail: [ad7f989](https://github.com/etcd-io/gofail/tree/ad7f989)
- github.com/getsentry/raven-go: [v0.2.0](https://github.com/getsentry/raven-go/tree/v0.2.0)
- github.com/go-kit/kit: [v0.9.0](https://github.com/go-kit/kit/tree/v0.9.0)
- github.com/josharian/intern: [v1.0.0](https://github.com/josharian/intern/tree/v1.0.0)
- github.com/opentracing/opentracing-go: [v1.1.0](https://github.com/opentracing/opentracing-go/tree/v1.1.0)

- 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)

- github.com/bradfitz/go-smtpd: deb6d62
- github.com/cockroachdb/datadriven: 80d97fb
- github.com/creack/pty: v1.1.7
- github.com/gliderlabs/ssh: v0.1.1
- github.com/go-critic/go-critic: 1df3008
- github.com/go-kit/kit: v0.8.0
- github.com/go-lintpack/lintpack: v0.5.2
- github.com/go-logfmt/logfmt: v0.3.0
- github.com/go-ole/go-ole: v1.2.1
- github.com/go-stack/stack: v1.8.0
- github.com/go-toolsmith/astcast: v1.0.0

- github.com/fsnotify/fsnotify: [v1.4.9 → v1.6.0](https://github.com/fsnotify/fsnotify/compare/v1.4.9...v1.6.0)
- github.com/go-kit/log: [v0.1.0 → v0.2.0](https://github.com/go-kit/log/compare/v0.1.0...v0.2.0)
- github.com/go-logfmt/logfmt: [v0.5.0 → v0.5.1](https://github.com/go-logfmt/logfmt/compare/v0.5.0...v0.5.1)

- github.com/fvbommel/sortorder: [v1.0.1 → v1.1.0](https://github.com/fvbommel/sortorder/compare/v1.0.1...v1.1.0)
- github.com/go-kit/log: [v0.2.0 → v0.2.1](https://github.com/go-kit/log/compare/v0.2.0...v0.2.1)
- github.com/go-logr/logr: [v1.2.3 → v1.2.4](https://github.com/go-logr/logr/compare/v1.2.3...v1.2.4)

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