Remove LinuxMain.swift and XCTestManifests.swift

Tests are automatically discovered on all platforms in Swift 5.4.

.github/workflows/ci.yml

@@ -46,11 +46,6 @@ jobs:
     - name: Clean debug build directory if necessary
       if: steps.debug_build.outcome == 'failure'
       run: rm -rf $(cd .build/debug && pwd -P)
-    - name: Check XCTestManifests.swift
-      if: runner.os == 'macOS'
-      run: |
-        swift test --generate-linuxmain -Xswiftc -swift-version -Xswiftc ${{ matrix.swift-compat-ver }}
-        git diff --exit-code
     - name: Test with debug mode.
       run: swift test --configuration debug -Xswiftc -swift-version -Xswiftc ${{ matrix.swift-compat-ver }}
     # RELEASE mode

Tests/LinuxMain.swift

@@ -1,8 +0,0 @@
-import XCTest
-
-import TimeSpecificationTests
-
-var tests = [XCTestCaseEntry]()
-tests += TimeSpecificationTests.__allTests()
-
-XCTMain(tests)

Tests/TimeSpecificationTests/XCTestManifests.swift

@@ -1,25 +0,0 @@
-#if !canImport(ObjectiveC)
-import XCTest
-
-extension TimeSpecificationTests {
-    // DO NOT MODIFY: This is autogenerated, use:
-    //   `swift test --generate-linuxmain`
-    // to regenerate.
-    static let __allTests__TimeSpecificationTests = [
-        ("test_codable", test_codable),
-        ("test_comparison", test_comparison),
-        ("test_date", test_date),
-        ("test_description", test_description),
-        ("test_floatLiteral", test_floatLiteral),
-        ("test_integerLiteral", test_integerLiteral),
-        ("test_normalization", test_normalization),
-        ("test_sumAndDifference", test_sumAndDifference),
-    ]
-}
-
-public func __allTests() -> [XCTestCaseEntry] {
-    return [
-        testCase(TimeSpecificationTests.__allTests__TimeSpecificationTests),
-    ]
-}
-#endif