feat: Source method (#134)

Implements method:
`/session/:sessionId/source`

Author: Squidonomics

Docs/SupportedAPIs.md

@@ -46,7 +46,7 @@ Contributions to expand support to unimplemented functionality are always welcom
 | GET    | `/session/:sessionId/orientation`                   | Supported    | Not implemented     |
 | POST   | `/session/:sessionId/refresh`                       | Not supported| `Session.refresh()` |
 | GET    | `/session/:sessionId/screenshot`                    | Supported    | `Session.screenshot()`|
-| GET    | `/session/:sessionId/source`                        | Supported    | Not implemented     |
+| GET    | `/session/:sessionId/source`                        | Supported    | `Session.source`    |
 | POST   | `/session/:sessionId/timeouts`                      | Supported    | `Session.setTimeout()`|
 | GET    | `/session/:sessionId/title`                         | Supported    | `Session.title`     |
 | POST   | `/session/:sessionId/touch/click`                   | Supported    | `Element.touchClick()`|

Sources/WebDriver/Requests.swift

@@ -541,6 +541,21 @@ public enum Requests {
         }
     }
 
+    // https://www.selenium.dev/documentation/legacy/json_wire_protocol/#sessionsessionidsource
+    public struct SessionSource: Request {
+        public var session: String 
+
+        public var pathComponents: [String] { ["session", session, "source"] }
+        public var method: HTTPMethod {.get}
+
+        public typealias Response = ResponseWithValue<ResponseValue>
+
+        public struct ResponseValue: Codable {
+            public var source: String
+        }
+
+    }
+
     // https://www.selenium.dev/documentation/legacy/json_wire_protocol/#status
     public struct Status: Request {
         public var pathComponents: [String] { ["status"] }

Sources/WebDriver/Session.swift

@@ -321,6 +321,12 @@ public class Session {
         try webDriver.send(Requests.SessionWindowSize.Post(session: id, windowHandle: handle, width: width, height: height))
     }
 
+    /// - Returns: The current page source.
+    public func source() throws -> String {
+        let response = try webDriver.send(Requests.SessionSource(session: id))
+        return response.value.source
+    }
+
     /// Deletes the current session.
     public func delete() throws {
         guard shouldDelete else { return }

Tests/UnitTests/APIToRequestMappingTests.swift

@@ -213,4 +213,14 @@ class APIToRequestMappingTests: XCTestCase {
         }
         XCTAssert(try session.size(window: "myWindow") == (width: 500, height: 500))
     }
+
+    func testSessionSource() throws {
+        let mockWebDriver: MockWebDriver = MockWebDriver()
+        let session = Session(webDriver: mockWebDriver, existingId: "mySession")
+
+        mockWebDriver.expect(path: "session/mySession/source", method: .get, type: Requests.SessionSource.self) {
+            ResponseWithValue(.init(source: "currentSource"))
+        }
+        XCTAssert(try session.source() == "currentSource")
+    }
 }