Separate parser and helpers from Password class for better testability

passKitTests/Parser/AdditionFieldTest.swift

@@ -0,0 +1,52 @@
+//
+//  AdditionFieldTest.swift
+//  passKitTests
+//
+//  Created by Danny Moesch on 30.09.18.
+//  Copyright © 2018 Bob Sun. All rights reserved.
+//
+
+import XCTest
+
+@testable import passKit
+
+class AdditionFieldTest: XCTestCase {
+
+    func testAdditionField() {
+        let field1 = "key" => "value"
+        let field2 = "some other key" => "some other value"
+        let field3 = "" => "no title"
+
+        XCTAssertEqual(field1.asString, "key: value")
+        XCTAssertEqual(field2.asString, "some other key: some other value")
+        XCTAssertEqual(field3.asString, "no title")
+
+        XCTAssertTrue(field1.asTuple == ("key", "value"))
+        XCTAssertTrue(field2.asTuple == ("some other key", "some other value"))
+        XCTAssertTrue(field3.asTuple == ("", "no title"))
+    }
+
+    func testAdditionFieldEquals() {
+        XCTAssertEqual("key" => "value", "key" => "value")
+        XCTAssertNotEqual("key" => "value", "key" => "some other value")
+    }
+
+    func testInfixAdditionFieldInitialization() {
+        XCTAssertEqual("key" => "value", AdditionField(title: "key", content: "value"))
+    }
+
+    func testAdditionFieldOperators() {
+        let field1 = "key" => "value"
+        let field2 = "some other key" => "some other value"
+        let field3 = "" => "no title"
+
+        XCTAssertEqual("start" | field1, "start\nkey: value")
+        XCTAssertEqual("" | field1, "\nkey: value")
+        XCTAssertEqual(field1 | "end", "key: value\nend")
+        XCTAssertEqual(field1 | "", "key: value")
+        XCTAssertEqual("start" | field1 | field2, "start\nkey: value\nsome other key: some other value")
+        XCTAssertEqual(field1 | field2 | "end", "key: value\nsome other key: some other value\nend")
+        XCTAssertEqual(field1 | field2 | field3, "key: value\nsome other key: some other value\nno title")
+        XCTAssertEqual("check" => "for right" | "operator" => "precedence", "check: for right\noperator: precedence")
+    }
+}