Support for Swift and Objective-C dependencies

tests/samples/codefiles/objective-c.m

@@ -0,0 +1,18 @@
+//
+//  Objective-C.m
+//
+
+#import "SomeViewController.h"
+#import <UIKit.h>
+#import <PromiseKit/Something.h>
+
+@interface ViewController : UIViewController
+  @property (nonnull, strong) URL *url;
+@end
+
+@implementation ViewController {
+- (void)viewDidLoad {
+  [super viewDidLoad];
+  // noop
+}
+@end

tests/samples/codefiles/swift.swift

@@ -0,0 +1,16 @@
+//
+//  Swift.swift
+//
+
+import Foundation
+import UIKit
+import PromiseKit
+
+class ViewController: UIViewController {
+
+  private var attribute: URL?
+
+  override func viewDidLoad() {
+    // noop
+  }
+}

tests/test_dependencies.py

@@ -397,3 +397,26 @@ class DependenciesTestCase(TestCase):
             expected_lines=37,
             entity='typescript.ts',
         )
+
+    def test_swift_dependencies_detected(self):
+        self.shared(
+            expected_dependencies=[
+                'UIKit',
+                'PromiseKit',
+            ],
+            expected_language='Swift',
+            expected_lines=16,
+            entity='swift.swift',
+        )
+
+    def test_objective_c_dependencies_detected(self):
+        self.shared(
+            expected_dependencies=[
+                'SomeViewController',
+                'UIKit',
+                'PromiseKit',
+            ],
+            expected_language='Objective-C',
+            expected_lines=18,
+            entity='objective-c.m',
+        )