#40: Add the login screen from EI.

- Remove SSO and replace fallback with OIDC.

UITests/Sources/LoginScreenUITests.swift

@@ -15,14 +15,128 @@
 //
 
 import XCTest
+import ElementX
 
+@MainActor
 class LoginScreenUITests: XCTestCase {
-    func testInitialStateComponents() {
-        let app = Application.launch()
+    var app: XCUIApplication!
+    
+    @MainActor
+    override func setUp() async throws {
+        app = nil
+    }
+    
+    func testMatrixDotOrg() {
+        app = Application.launch()
         app.goToScreenWithIdentifier(.login)
         
-        XCTAssert(app.buttons["Login"].exists)
-        XCTAssert(app.textFields["Username"].exists)
-        XCTAssert(app.secureTextFields["Password"].exists)
+        let state = "matrix.org"
+        validateServerDescriptionIsVisible(for: state)
+        validateLoginFormIsVisible(for: state)
+        validateOIDCButtonIsHidden(for: state)
+        validateNextButtonIsDisabled(for: state)
+        validateUnsupportedServerTextIsHidden(for: state)
+        
+        app.textFields.element.tap()
+        app.typeText("@test:server.com")
+        
+        app.secureTextFields.element.tap()
+        app.typeText("12345678")
+        
+        validateNextButtonIsEnabled(for: "matrix.org with credentials entered")
+    }
+    
+    func testOIDC() {
+        app = Application.launch()
+        app.goToScreenWithIdentifier(.loginOIDC)
+        
+        let state = "an OIDC only server"
+        validateServerDescriptionIsHidden(for: state)
+        validateLoginFormIsHidden(for: state)
+        validateOIDCButtonIsShown(for: state)
+        validateUnsupportedServerTextIsHidden(for: state)
+    }
+    
+    func testUnsupported() {
+        app = Application.launch()
+        app.goToScreenWithIdentifier(.loginUnsupported)
+        
+        let state = "an unsupported server"
+        validateServerDescriptionIsHidden(for: state)
+        validateLoginFormIsHidden(for: state)
+        validateOIDCButtonIsHidden(for: state)
+        validateUnsupportedServerTextIsShown(for: state)
+    }
+    
+    /// Checks that the server description label is shown.
+    func validateServerDescriptionIsVisible(for state: String) {
+        let descriptionLabel = app.staticTexts["serverDescriptionText"]
+        XCTAssertTrue(descriptionLabel.exists, "The server description should be shown for \(state).")
+    }
+    
+    /// Checks that the server description label is hidden.
+    func validateServerDescriptionIsHidden(for state: String) {
+        let descriptionLabel = app.staticTexts["serverDescriptionText"]
+        XCTAssertFalse(descriptionLabel.exists, "The server description should be shown for \(state).")
+    }
+    
+    /// Checks that the username and password text fields are shown along with the next button.
+    func validateLoginFormIsVisible(for state: String) {
+        let usernameTextField = app.textFields.element
+        let passwordTextField = app.secureTextFields.element
+        let nextButton = app.buttons["nextButton"]
+        
+        XCTAssertTrue(usernameTextField.exists, "Username input should be shown for \(state).")
+        XCTAssertTrue(passwordTextField.exists, "Password input should be shown for \(state).")
+        XCTAssertTrue(nextButton.exists, "The next button should be shown for \(state).")
+    }
+    
+    /// Checks that the username and password text fields are hidden along with the next button.
+    func validateLoginFormIsHidden(for state: String) {
+        let usernameTextField = app.textFields.element
+        let passwordTextField = app.secureTextFields.element
+        let nextButton = app.buttons["nextButton"]
+        
+        XCTAssertFalse(usernameTextField.exists, "Username input should not be shown for \(state).")
+        XCTAssertFalse(passwordTextField.exists, "Password input should not be shown for \(state).")
+        XCTAssertFalse(nextButton.exists, "The next button should not be shown for \(state).")
+    }
+    
+    /// Checks that the next button is shown but is disabled.
+    func validateNextButtonIsDisabled(for state: String) {
+        let nextButton = app.buttons["nextButton"]
+        XCTAssertTrue(nextButton.exists, "The next button should be shown.")
+        XCTAssertFalse(nextButton.isEnabled, "The next button should be disabled for \(state).")
+    }
+    
+    /// Checks that the next button is shown and is enabled.
+    func validateNextButtonIsEnabled(for state: String) {
+        let nextButton = app.buttons["nextButton"]
+        XCTAssertTrue(nextButton.exists, "The next button should be shown.")
+        XCTAssertTrue(nextButton.isEnabled, "The next button should be enabled for \(state).")
+    }
+    
+    /// Checks that the OIDC button is shown on the screen.
+    func validateOIDCButtonIsShown(for state: String) {
+        let oidcButton = app.buttons["oidcButton"]
+        XCTAssertTrue(oidcButton.exists, "The OIDC button should be shown for \(state).")
+    }
+    
+    /// Checks that the OIDC button is not shown on the screen.
+    func validateOIDCButtonIsHidden(for state: String) {
+        let oidcButton = app.buttons["oidcButton"]
+        XCTAssertFalse(oidcButton.exists, "The OIDC button should be hidden for \(state).")
+    }
+    
+    /// Checks that the unsupported homeserver text is shown on the screen.
+    func validateUnsupportedServerTextIsShown(for state: String) {
+        let unsupportedText = app.staticTexts["unsupportedServerText"]
+        XCTAssertTrue(unsupportedText.exists, "The unsupported homeserver text should be shown for \(state).")
+    }
+    
+    /// Checks that the unsupported homeserver text is not shown on the screen.
+    func validateUnsupportedServerTextIsHidden(for state: String) {
+        let unsupportedText = app.staticTexts["unsupportedServerText"]
+        XCTAssertFalse(unsupportedText.exists, "The unsupported homeserver text should be hidden for \(state).")
     }
 }