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# frozen_string_literal: true
require "webmock/rspec"
RSpec.describe Dispatch::Adapter::Claude, "#count_tokens" do
let(:model_id) { "claude-sonnet-4-6" }
let(:api_key) { "sk-ant-api03-test" }
let(:base_url) { "https://api.anthropic.com" }
let(:count_tokens_url) { "#{base_url}/v1/messages/count_tokens" }
subject(:adapter) do
described_class.new(
model: model_id,
api_key: api_key,
base_url: base_url
)
end
let(:messages) do
[Dispatch::Adapter::Message.new(
role: "user",
content: [Dispatch::Adapter::TextBlock.new(text: "Hello, how many tokens?")]
)]
end
before { WebMock.disable_net_connect! }
after { WebMock.reset! }
# ── Happy path ────────────────────────────────────────────────────────────
describe "successful count" do
before do
stub_request(:post, count_tokens_url)
.to_return(
status: 200,
body: JSON.generate({ "input_tokens" => 1234 }),
headers: { "Content-Type" => "application/json" }
)
end
it "returns the integer token count" do
expect(adapter.count_tokens(messages)).to eq(1234)
end
it "posts to /v1/messages/count_tokens (not /v1/messages)" do
adapter.count_tokens(messages)
expect(WebMock).to have_requested(:post, count_tokens_url)
expect(WebMock).not_to have_requested(:post, "#{base_url}/v1/messages")
end
it "includes the model in the request body" do
adapter.count_tokens(messages)
expect(WebMock).to(have_requested(:post, count_tokens_url)
.with { |req| JSON.parse(req.body)["model"] == model_id })
end
it "includes messages in the request body" do
adapter.count_tokens(messages)
expect(WebMock).to(have_requested(:post, count_tokens_url)
.with { |req| JSON.parse(req.body)["messages"].is_a?(Array) })
end
end
# ── Unsupported fields stripped ───────────────────────────────────────────
describe "stripped fields" do
before do
stub_request(:post, count_tokens_url)
.to_return(
status: 200,
body: JSON.generate({ "input_tokens" => 42 }),
headers: { "Content-Type" => "application/json" }
)
end
it "does NOT include 'stream' in the request body" do
adapter.count_tokens(messages)
expect(WebMock).to(have_requested(:post, count_tokens_url)
.with { |req| !JSON.parse(req.body).key?("stream") })
end
it "does NOT include 'max_tokens' in the request body" do
adapter.count_tokens(messages)
expect(WebMock).to(have_requested(:post, count_tokens_url)
.with { |req| !JSON.parse(req.body).key?("max_tokens") })
end
it "does NOT include 'metadata' in the request body" do
adapter.count_tokens(messages)
expect(WebMock).to(have_requested(:post, count_tokens_url)
.with { |req| !JSON.parse(req.body).key?("metadata") })
end
it "does NOT include 'output_config' in the request body" do
adapter.count_tokens(messages)
expect(WebMock).to(have_requested(:post, count_tokens_url)
.with { |req| !JSON.parse(req.body).key?("output_config") })
end
end
# ── With tools ────────────────────────────────────────────────────────────
describe "with tools" do
let(:tool) do
Dispatch::Adapter::ToolDefinition.new(
name: "bash",
description: "Run a bash command",
parameters: {
"type" => "object",
"properties" => { "command" => { "type" => "string" } },
"required" => ["command"]
}
)
end
before do
stub_request(:post, count_tokens_url)
.to_return(
status: 200,
body: JSON.generate({ "input_tokens" => 500 }),
headers: { "Content-Type" => "application/json" }
)
end
it "includes tools in the request body" do
adapter.count_tokens(messages, tools: [tool])
expect(WebMock).to(have_requested(:post, count_tokens_url)
.with do |req|
body = JSON.parse(req.body)
body.key?("tools") && body["tools"].is_a?(Array) && body["tools"].length == 1
end)
end
it "returns the token count" do
expect(adapter.count_tokens(messages, tools: [tool])).to eq(500)
end
end
# ── With system prompt ────────────────────────────────────────────────────
describe "with system prompt" do
before do
stub_request(:post, count_tokens_url)
.to_return(
status: 200,
body: JSON.generate({ "input_tokens" => 300 }),
headers: { "Content-Type" => "application/json" }
)
end
it "includes system in the request body" do
adapter.count_tokens(messages, system: "You are a helpful assistant")
expect(WebMock).to(have_requested(:post, count_tokens_url)
.with do |req|
body = JSON.parse(req.body)
body.key?("system")
end)
end
it "returns the token count" do
expect(adapter.count_tokens(messages, system: "Be helpful")).to eq(300)
end
end
# ── Error handling ────────────────────────────────────────────────────────
describe "network failure" do
before do
stub_request(:post, count_tokens_url).to_raise(Errno::ECONNREFUSED)
end
it "returns -1 without raising" do
expect(adapter.count_tokens(messages)).to eq(-1)
end
end
describe "HTTP error response" do
before do
stub_request(:post, count_tokens_url)
.to_return(
status: 401,
body: JSON.generate({ "error" => { "message" => "Unauthorized" } }),
headers: { "Content-Type" => "application/json" }
)
end
it "returns -1 on AuthenticationError" do
expect(adapter.count_tokens(messages)).to eq(-1)
end
end
describe "server error" do
before do
stub_request(:post, count_tokens_url)
.to_return(
status: 500,
body: JSON.generate({ "error" => { "message" => "Internal error" } }),
headers: { "Content-Type" => "application/json" }
)
end
it "returns -1 on ServerError" do
expect(adapter.count_tokens(messages)).to eq(-1)
end
end
describe "malformed JSON response" do
before do
stub_request(:post, count_tokens_url)
.to_return(status: 200, body: "not json", headers: {})
end
it "returns -1 on JSON parse error" do
expect(adapter.count_tokens(messages)).to eq(-1)
end
end
# ── Default -1 from Base ──────────────────────────────────────────────────
describe "Base#count_tokens default" do
it "returns -1 as the default implementation in Base" do
base = Dispatch::Adapter::Base.new
expect(base.count_tokens([])).to eq(-1)
end
end
end
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