No Testing on Swift < 6.0

Author: plemarquand

Diff for: assets/test/diagnostics/Sources/main.swift

@@ -13,5 +13,7 @@ repeat {
   print(line ?? "nil")
 } while line != nil;
 
+#if swift(>=6.0)
 import Testing
-#expect(try myFunc() != 0)
+#expect(try myFunc() != 0)
+#endif

Diff for: test/integration-tests/DiagnosticsManager.test.ts

@@ -178,7 +178,9 @@ suite("DiagnosticsManager Test Suite", async function () {
                 // Should have parsed correct severity
                 assertHasDiagnostic(mainUri, expectedWarningDiagnostic);
                 assertHasDiagnostic(mainUri, expectedMainErrorDiagnostic);
-                assertHasDiagnostic(mainUri, expectedMacroDiagnostic);
+                if (workspaceContext.swiftVersion.isGreaterThanOrEqual(new Version(6, 0, 0))) {
+                    assertHasDiagnostic(mainUri, expectedMacroDiagnostic);
+                }
                 // Check parsed for other file
                 assertHasDiagnostic(funcUri, expectedFuncErrorDiagnostic);
             }).timeout(2 * 60 * 1000); // Allow 2 minutes to build
@@ -201,7 +203,9 @@ suite("DiagnosticsManager Test Suite", async function () {
                 // Should have parsed severity
                 assertHasDiagnostic(mainUri, expectedWarningDiagnostic);
                 assertHasDiagnostic(mainUri, expectedMainErrorDiagnostic);
-                assertHasDiagnostic(mainUri, expectedMacroDiagnostic);
+                if (workspaceContext.swiftVersion.isGreaterThanOrEqual(new Version(6, 0, 0))) {
+                    assertHasDiagnostic(mainUri, expectedMacroDiagnostic);
+                }
                 // Check parsed for other file
                 assertHasDiagnostic(funcUri, expectedFuncErrorDiagnostic);
             }).timeout(2 * 60 * 1000); // Allow 2 minutes to build