chore: Naming conventions

tests/lexer/ScanPrologTests.kt

@@ -9,7 +9,7 @@ import kotlin.test.assertEquals
  *
  * These tests are based on the Prolog syntax.
  */
-class LexerScanPrologTest {
+class ScanPrologTests {
     @Test
     fun scan_simple_atom() {
         val tokens = Lexer("atom.").scan()

tests/lexer/ScanTests.kt

@@ -4,7 +4,7 @@ import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertThrows
 import org.junit.jupiter.api.Assertions.*
 
-class LexerScanTest {
+class ScanTests {
     @Test
     fun scan_emptyString_returns_EOF() {
         val tokens = Lexer("").scan()