Make classes final

Gardening, NFC.

Author: dduan

Tests/FileCheckTests/DAGSpec.swift

@@ -2,7 +2,7 @@ import FileCheck
 import XCTest
 import Foundation
 
-class DAGSpec : XCTestCase {
+final class DAGSpec : XCTestCase {
   func testPrefixOrderInvariant() {
     XCTAssert(fileCheckOutput(of: .stdout, withPrefixes: ["BA", "AA"]) {
       // BA-DAG: this is the string to be {{matched}}

Tests/FileCheckTests/DefinesSpec.swift

@@ -2,7 +2,7 @@ import FileCheck
 import XCTest
 import Foundation
 
-class DefinesSpec : XCTestCase {
+final class DefinesSpec : XCTestCase {
   func testGlobalDefines() {
     XCTAssert(fileCheckOutput(of: .stdout, withPrefixes: ["PASSDEF"], withGlobals: ["VALUE":"10"]) {
       // PASSDEF: Value = [[VALUE]]

Tests/FileCheckTests/EmptySpec.swift

@@ -2,7 +2,7 @@ import FileCheck
 import XCTest
 import Foundation
 
-class EmptySpec : XCTestCase {
+final class EmptySpec : XCTestCase {
   func testEmptyError() {
     XCTAssert(fileCheckOutput(of: .stdout, withPrefixes: ["EMPTY-ERR"]) {
       // EMPTY-ERR: FileCheck error: input from file descriptor stdout is empty.

Tests/FileCheckTests/FileCheckSpec.swift

@@ -2,7 +2,7 @@ import FileCheck
 import XCTest
 import Foundation
 
-class FileCheckSpec : XCTestCase {
+final class FileCheckSpec : XCTestCase {
   func testCustomInputBuffer() {
     XCTAssert(fileCheckOutput(of: .stdout, withPrefixes: ["CUSTOMEMPTYBUF-ERR"]) {
       // CUSTOMEMPTYBUF-ERR: error: no check strings found with prefixes

Tests/FileCheckTests/LabelSpec.swift

@@ -2,7 +2,7 @@ import FileCheck
 import XCTest
 import Foundation
 
-class LabelSpec : XCTestCase {
+final class LabelSpec : XCTestCase {
   let outputABC = {
     print([
       "label0:",

Tests/FileCheckTests/LineCountSpec.swift

@@ -3,7 +3,7 @@ import FileCheck
 import XCTest
 import Foundation
 
-class LineCountSpec : XCTestCase {
+final class LineCountSpec : XCTestCase {
   func testLineCount() {
     let txt = ((1...8).map({ "\($0)" }) + [
         "9 aaa"

Tests/FileCheckTests/MultiPrefixSpec.swift

@@ -2,7 +2,7 @@ import FileCheck
 import XCTest
 import Foundation
 
-class MultiPrefixSpec : XCTestCase {
+final class MultiPrefixSpec : XCTestCase {
   func testMultiplePrefixSubstr() {
     XCTAssert(fileCheckOutput(of: .stdout, withPrefixes: ["CHECKER1", "CHECK"]) {
       // CHECKER1: fo{{o}}

Tests/FileCheckTests/RegexScopeSpec.swift

@@ -2,7 +2,7 @@ import FileCheck
 import XCTest
 import Foundation
 
-class RegexScopeSpec : XCTestCase {
+final class RegexScopeSpec : XCTestCase {
   func testRegexScope() {
     let block = { () -> () in
       // CHECK: [[LOCAL:loc.*]]

Tests/FileCheckTests/VariableRefSpec.swift

@@ -2,7 +2,7 @@ import FileCheck
 import XCTest
 import Foundation
 
-class VariableRefSpec : XCTestCase {
+final class VariableRefSpec : XCTestCase {
   func testSameLineVarRef() {
     XCTAssert(fileCheckOutput(of: .stdout) {
       // CHECK: op1 [[REG:r[0-9]+]], {{r[0-9]+}}, [[REG]]