👌 FileSystem changes, rework and testing

tests/unit/Testables/Filesystem/TestableFileSystemTest.swift

@@ -0,0 +1,61 @@
+//
+//  TestableFileSystemTest.swift
+//  PHP Monitor
+//
+//  Created by Nico Verbruggen on 01/11/2022.
+//  Copyright © 2022 Nico Verbruggen. All rights reserved.
+//
+
+import XCTest
+
+class TestableFileSystemTest: XCTestCase {
+
+    override class func setUp() {
+        ActiveFileSystem.useTestable([
+            "/home/user/bin": .fake(.directory),
+            "/home/user/bin/foo": .fake(.binary),
+            "/home/user/documents": .fake(.directory),
+            "/home/user/docs": .fake(.symlink, "/home/user/documents"),
+            "/home/user/documents/nice.txt": .fake(.text, "69"),
+            "/home/user/documents/script.sh": .fake(.text, "echo 'cool';")
+        ])
+    }
+
+    func test_testable_fs_is_in_use() {
+        XCTAssertTrue(FileSystem is TestableFileSystem)
+    }
+
+    func test_binary_directory_exists() {
+        XCTAssertTrue(FileSystem.directoryExists("/home/user/bin"))
+    }
+
+    func test_binary_directory_is_writable() {
+        XCTAssertTrue(FileSystem.isWriteableFile("/home/user/bin"))
+    }
+
+    func test_binary_exists() {
+        XCTAssertTrue(FileSystem.isExecutableFile("/home/user/bin/foo"))
+    }
+
+    func test_can_write_text_to_executable() throws {
+        try! FileSystem.writeAtomicallyToFile("/home/user/bin/bar", content: "bar bar bar!")
+
+        XCTAssertFalse(FileSystem.isExecutableFile("/home/user/bin/bar"))
+
+        try! FileSystem.makeExecutable("/home/user/bin/bar")
+
+        XCTAssertTrue(FileSystem.isExecutableFile("/home/user/bin/bar"))
+    }
+
+    func test_can_create_directory() throws {
+        try! FileSystem.createDirectory(
+            "/home/nico/phpmon/config",
+            withIntermediateDirectories: true
+        )
+
+        XCTAssertTrue(FileSystem.anyExists("/home/nico/phpmon/config"))
+        XCTAssertTrue(FileSystem.directoryExists("/home/nico/phpmon/config"))
+    }
+
+    // TODO: Implement and test the remove() and move() methods and reorganize method order
+}