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@testable import AzureCore
import XCTest

class HeadersPolicyTests: XCTestCase {
    /// Test that the headers policy adds headers to a request
    func test_HeadersPolicy_AddsHeadersToRequest() {
        var addedHeaders = HTTPHeaders([.contentType: "test/test"])
        addedHeaders["TestHeader"] = "Testing"
        let policy = HeadersPolicy(addingHeaders: addedHeaders)
        let req = PipelineRequest()
        policy.on(request: req) { _, _ in }
        XCTAssertEqual(req.httpRequest.headers[.contentType], "test/test")
        XCTAssertEqual(req.httpRequest.headers["TestHeader"], "Testing")
    }

    /// Test that the headers policy overwrites the existing value of a header
    func test_HeadersPolicy_OverwritesPreviousHeaderValues() {
        var addedHeaders = HTTPHeaders([.contentType: "test/test"])
        addedHeaders["TestHeader"] = "Testing"
        let policy = HeadersPolicy(addingHeaders: addedHeaders)
        let headers = HTTPHeaders([.contentType: "application/json"])
        let req = PipelineRequest(headers: headers)
        policy.on(request: req) { _, _ in }
        XCTAssertEqual(req.httpRequest.headers[.contentType], "test/test")
        XCTAssertEqual(req.httpRequest.headers["TestHeader"], "Testing")
    }
}
