20: Added test to guard against issue #20

Tests/LazyContainersTests/GitHubIssue20Tests.swift

@@ -0,0 +1,37 @@
+//
+//  GitHubIssue20Tests.swift
+//  LazyContainersTests
+//
+//  Created by Ben Leggiero on 2020-07-29.
+//
+
+import XCTest
+@testable import LazyContainers
+
+
+
+var shouldNotRun = false
+
+class ShouldNotInit {
+    init() {
+        shouldNotRun = true
+    }
+}
+
+
+
+/// Guards against issue #20
+/// https://github.com/RougeWare/Swift-Lazy-Patterns/issues/20
+final class GitHubIssue20Tests: XCTestCase {
+
+    @Lazy
+    var lazyShouldNotRun = ShouldNotInit()
+
+    func testLazyInitWithPropertyWrapper() {
+        XCTAssertFalse(shouldNotRun)
+    }
+
+    static var allTests = [
+        ("testLazyInitWithPropertyWrapper", testLazyInitWithPropertyWrapper)
+    ]
+}

Tests/LazyContainersTests/XCTestManifests.swift

@@ -4,6 +4,7 @@ import XCTest
 public func allTests() -> [XCTestCaseEntry] {
     return [
         testCase(LazyContainersTests.allTests),
+        testCase(GitHubIssue20Tests.allTests),
     ]
 }
 #endif

Tests/LinuxMain.swift

@@ -2,6 +2,9 @@ import XCTest
 
 import LazyContainersTests
 
-var tests = [XCTestCaseEntry]()
-tests += LazyContainersTests.allTests()
+let tests: [XCTestCaseEntry] = [
+    LazyContainersTests.allTests,
+    GitHubIssue20Tests.allTests,
+]
+
 XCTMain(tests)