File: ConfigurationTests.swift

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import SwiftFormat
import XCTest

final class ConfigurationTests: XCTestCase {
  func testDefaultConfigurationIsSameAsEmptyDecode() {
    // Since we don't use the synthesized `init(from: Decoder)` and allow fields
    // to be missing, we provide defaults there as well as in the property
    // declarations themselves. This test ensures that creating a default-
    // initialized `Configuration` is identical to decoding one from an empty
    // JSON input, which verifies that those defaults are always in sync.
    let defaultInitConfig = Configuration()

    let emptyDictionaryData = "{}\n".data(using: .utf8)!
    let jsonDecoder = JSONDecoder()
    let emptyJSONConfig =
      try! jsonDecoder.decode(Configuration.self, from: emptyDictionaryData)

    XCTAssertEqual(defaultInitConfig, emptyJSONConfig)
  }
}