[stdlib] validationt test for StrideTo/StrideThrough sequences (#3363)

Author: moiseev

validation-test/stdlib/Stride.swift

@@ -0,0 +1,19 @@
+// RUN: %target-run-simple-swift
+// REQUIRES: executable_test
+
+import StdlibUnittest
+import StdlibCollectionUnittest
+
+var StrideTestSuite = TestSuite("Stride")
+
+StrideTestSuite.test("to") {
+  checkSequence(Array(0...4), stride(from: 0, to: 5, by: 1))
+  checkSequence(Array(1...5).reversed(), stride(from: 5, to: 0, by: -1))
+}
+
+StrideTestSuite.test("through") {
+  checkSequence(Array(0...5), stride(from: 0, through: 5, by: 1))
+  checkSequence(Array(0...5).reversed(), stride(from: 5, through: 0, by: -1))
+}
+
+runAllTests()