Add tests for FunctionInvokeOptions

Author: Guilherme Souza

Tests/FunctionsTests/FunctionInvokeOptionsTests.swift

@@ -0,0 +1,25 @@
+@testable import Functions
+import XCTest
+
+final class FunctionInvokeOptionsTests: XCTestCase {
+  func testStringBody() {
+    let options = FunctionInvokeOptions(body: "string value")
+    XCTAssertEqual(options.headers["Content-Type"], "text/plain")
+    XCTAssertNotNil(options.body)
+  }
+
+  func testDataBody() {
+    let options = FunctionInvokeOptions(body: "binary value".data(using: .utf8)!)
+    XCTAssertEqual(options.headers["Content-Type"], "application/octet-stream")
+    XCTAssertNotNil(options.body)
+  }
+
+  func testEncodableBody() {
+    struct Body: Encodable {
+      let value: String
+    }
+    let options = FunctionInvokeOptions(body: Body(value: "value"))
+    XCTAssertEqual(options.headers["Content-Type"], "application/json")
+    XCTAssertNotNil(options.body)
+  }
+}