Add DMP layer tests

Author: dsmurfin

Tests/sACNKitTests/DMPLayerTests.swift

@@ -0,0 +1,26 @@
+import XCTest
+@testable import sACNKit
+
+final class DMPLayerTests: XCTestCase {
+    
+    /// The test DMP Layer data.
+    static let testDMPLayerData: Data = DMPLayer.createAsData(startCode: .perAddressPriority, values: [50] + Array(repeating: 0, count: 511))
+    
+    /// Creates a DMP Layer.
+    func testCreateDMPLayer() throws {
+        let testLayer = Self.testDMPLayerData
+        let expectedString = "720b02a1000000010201dd" + "32" + Array(repeating: "00", count: 511).joined()
+
+        XCTAssertEqual(testLayer.hexEncodedString(), expectedString)
+    }
+    
+    /// Replaces the values in a DMP Layer range.
+    func testReplaceDMPLayerValuesRange() throws {
+        var testLayer = Self.testDMPLayerData
+        testLayer.replacingDMPLayerValues(with: [255, 254] + Array(repeating: 0, count: 510))
+        let expectedString = "720b02a1000000010201dd" + "fffe" + Array(repeating: "00", count: 510).joined()
+
+        XCTAssertEqual(testLayer.hexEncodedString(), expectedString)
+    }
+    
+}