     func testGetToneEmptyString() {
         let expectation = self.expectation(description: "Get tone with an empty string.")
         let failure = { (error: Error) in expectation.fulfill() }
-        toneAnalyzer.tone(
-            toneInput: ToneInput(text: ""),
-            contentType: "plain/text",
-            failure: failure,
-            success: failWithResult
-        )
+        toneAnalyzer.tone(toneInput: ToneInput(text: ""), failure: failure, success: failWithResult)
         waitForExpectations()
     }
 


    static var allTests: [(String, (ToneAnalyzerTests) -> () throws -> Void)] {
        return [
            ("testGetTone", testGetTone),
            ("testGetToneCustom", testGetToneCustom),
            ("testToneChat", testToneChat),
            ("testGetToneEmptyString", testGetToneEmptyString),


    // MARK: - Positive Tests

    func testGetToneJSON() {
        let expectation = self.expectation(description: "Get tone.")
        toneAnalyzer.tone(toneInput: ToneInput(text: text), failure: failWithError) {
            toneAnalysis in
            XCTAssertNotNil(toneAnalysis.documentTone.tones)
            XCTAssertGreaterThan(toneAnalysis.documentTone.tones!.count, 0)
