text: package useragent
  
  import "testing"
  
  func TestVersionInfo(t *testing.T) {
  	vi := VersionInfo{"foo", "bar"}
  	if !vi.isValid() {
  		t.Fatalf("VersionInfo should be valid")
  	}
  	vi = VersionInfo{"", "bar"}
  	if vi.isValid() {
  		t.Fatalf("Expected VersionInfo to be invalid")
  	}
  	vi = VersionInfo{"foo", ""}
  	if vi.isValid() {
  		t.Fatalf("Expected VersionInfo to be invalid")
  	}
  }
  
  func TestAppendVersions(t *testing.T) {
  	vis := []VersionInfo{
  		{"foo", "1.0"},
  		{"bar", "0.1"},
  		{"pi", "3.1.4"},
  	}
  	v := AppendVersions("base", vis...)
  	expect := "base foo/1.0 bar/0.1 pi/3.1.4"
  	if v != expect {
  		t.Fatalf("expected %q, got %q", expect, v)
  	}
  }
  