1 more test case for 063.

Author: Di Wu

Solutions/Solutions/Medium/Medium_063_Unique_Paths_II.swift

@@ -36,6 +36,9 @@ struct Medium_063_Unique_Paths_II {
         if obstacleGrid.count == 0 {
             return 0
         }
+        if obstacleGrid[0].count == 0 {
+            return 0
+        }
         let rows = obstacleGrid.count
         let cols = obstacleGrid[0].count
 

Solutions/SolutionsTests/Medium/Medium_063_Unique_Paths_II_Test.swift

@@ -54,6 +54,13 @@ class Medium_063_Unique_Paths_II_Test: XCTestCase, SolutionsTestCase {
         let expected: Int = 10
         asyncHelper(input: input, expected: expected)
     }
+    func test_006() {
+        let input: [[Int]] = [
+            []
+        ]
+        let expected: Int = 0
+        asyncHelper(input: input, expected: expected)
+    }
     private func asyncHelper(input: [[Int]], expected: Int) {
         weak var expectation: XCTestExpectation? = self.expectation(description:timeOutName())
         serialQueue().async(execute: { () -> Void in