[ECO-5482] Added unit tests for for utilies

- Enhanced ObjectIdTest with testFromInitialValue test for object initialization
- Added new test methods to UtilsTest for realtime operation utilities
- Updated ObjectMessageSizeTest with realtime write operation size calculations

Author: sacOO7

live-objects/src/test/kotlin/io/ably/lib/objects/integration/DefaultLiveObjectsTest.kt

@@ -14,6 +14,7 @@ import org.junit.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertNotNull
 import kotlin.test.assertNull
+import kotlin.test.assertTrue
 import kotlin.text.toByteArray
 
 class DefaultLiveObjectsTest : IntegrationTest() {
@@ -114,7 +115,7 @@ class DefaultLiveObjectsTest : IntegrationTest() {
     val bytesValue = valuesMap.get("bytes")?.asBinary
     assertNotNull(bytesValue)
     val expectedBinary = "eyJwcm9kdWN0SWQiOiAiMDAxIiwgInByb2R1Y3ROYW1lIjogImNhciJ9".toByteArray()
-    assertEquals(expectedBinary.contentEquals(bytesValue), true) // Should contain encoded JSON data
+    assertTrue(expectedBinary.contentEquals(bytesValue)) // Should contain encoded JSON data
 
     val emptyBytesValue = valuesMap.get("emptyBytes")?.asBinary
     assertNotNull(emptyBytesValue)

live-objects/src/test/kotlin/io/ably/lib/objects/unit/ObjectIdTest.kt

@@ -52,4 +52,24 @@ class ObjectIdTest {
     assertEquals(92_000, exception.errorInfo?.code)
     assertEquals(500, exception.errorInfo?.statusCode)
   }
+
+  @Test
+  fun testFromInitialValue() {
+    val objectType = ObjectType.Map
+    val initialValue = "test-value"
+    val nonce = "test-nonce"
+    val msTimestamp = 1640995200000L
+
+    val objectId = ObjectId.fromInitialValue(objectType, initialValue, nonce, msTimestamp)
+    // Verify the string format follows the expected pattern: type:hash@timestamp
+    val objectIdString = objectId.toString()
+    assertTrue(objectIdString.startsWith("map:"))
+    assertTrue(objectIdString.contains("@"))
+    assertTrue(objectIdString.endsWith(msTimestamp.toString()))
+
+    val expectedHash = "GSjv-adTaJPL8-382qF3JuIyE4TCc6QKIIqb577pz00"
+    // Verify the hash value matches expected
+    val hashPart = objectIdString.substring(4, objectIdString.indexOf("@"))
+    assertEquals(expectedHash, hashPart)
+  }
 }

live-objects/src/test/kotlin/io/ably/lib/objects/unit/ObjectMessageSizeTest.kt

@@ -168,7 +168,7 @@ class ObjectMessageSizeTest {
     }
     // Assert on error code and message
     assertEquals(40009, exception.errorInfo.code)
-    val expectedMessage = "ObjectMessage size 66560 exceeds maximum allowed size of 65536 bytes"
+    val expectedMessage = "ObjectMessages size 66560 exceeds maximum allowed size of 65536 bytes"
     assertEquals(expectedMessage, exception.errorInfo.message)
   }
 }

live-objects/src/test/kotlin/io/ably/lib/objects/unit/UtilsTest.kt

@@ -12,6 +12,24 @@ import java.util.concurrent.CancellationException
 
 class UtilsTest {
 
+  @Test
+  fun testGenerateNonce() {
+    // Test basic functionality
+    val nonce1 = generateNonce()
+    val nonce2 = generateNonce()
+
+    assertEquals(16, nonce1.length)
+    assertEquals(16, nonce2.length)
+    assertNotEquals(nonce1, nonce2) // Should be random
+
+    // Test character set
+    val validChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+    val nonce = generateNonce()
+    nonce.forEach { char ->
+      assertTrue("Nonce should only contain valid characters", validChars.contains(char))
+    }
+  }
+
   @Test
   fun testStringByteSize() {
     // Test ASCII strings