Merge pull request #5 from rkukuh/dev

Add `before` extension to String library and its test case

Sources/SwiftStringHelper/StringBeforeExtensions.swift

@@ -0,0 +1,19 @@
+//
+//  StringBeforeExtensions.swift
+//  
+//
+//  Created by R. Kukuh on 26/03/23.
+//
+
+import Foundation
+
+public extension String {
+    func before(_ value: String) -> String {
+        if let range = self.range(of: value) {
+            return String(self[..<range.lowerBound])
+        }
+
+        return self
+    }
+}
+

Tests/SwiftStringHelperTests/StringBeforeTests.swift

@@ -0,0 +1,31 @@
+//
+//  StringBeforeTests.swift
+//  
+//
+//  Created by R. Kukuh on 26/03/23.
+//
+
+import XCTest
+@testable import SwiftStringHelper
+
+class StringBeforeTests: XCTestCase {
+
+    func testBefore() {
+        let originalString = "[email protected]"
+        let result = originalString.before("@")
+        XCTAssertEqual(result, "hello", "The string before '@' should be 'hello'")
+    }
+
+    func testBeforeWhenNotFound() {
+        let originalString = "[email protected]"
+        let result = originalString.before("#")
+        XCTAssertEqual(result, originalString, "The string before '#' should be the same as the original string when '#' is not found")
+    }
+
+    func testBeforeWhenEmpty() {
+        let originalString = ""
+        let result = originalString.before("@")
+        XCTAssertEqual(result, originalString, "The string before '@' should be the same as the original string when the original string is empty")
+    }
+
+}