Scala : Scala : add objsets

1 files changed, 72 insertions, 0 deletions

diff --git a/Scala/objsets/src/test/scala/objsets/TweetSetSuite.scala b/Scala/objsets/src/test/scala/objsets/TweetSetSuite.scala
new file mode 100644
index 0000000..be82938
--- /dev/null
+++ b/Scala/objsets/src/test/scala/objsets/TweetSetSuite.scala
@@ -0,0 +1,72 @@
+package objsets
+
+import org.scalatest.FunSuite
+
+import org.junit.runner.RunWith
+import org.scalatest.junit.JUnitRunner
+
+@RunWith(classOf[JUnitRunner])
+class TweetSetSuite extends FunSuite {
+  trait TestSets {
+    val set1 = new Empty
+    val set2 = set1.incl(new Tweet("a", "a body", 20))
+    val set3 = set2.incl(new Tweet("b", "b body", 20))
+    val c = new Tweet("c", "c body", 7)
+    val d = new Tweet("d", "d body", 9)
+    val set4c = set3.incl(c)
+    val set4d = set3.incl(d)
+    val set5 = set4c.incl(d)
+  }
+
+  def asSet(tweets: TweetSet): Set[Tweet] = {
+    var res = Set[Tweet]()
+    tweets.foreach(res += _)
+    res
+  }
+
+  def size(set: TweetSet): Int = asSet(set).size
+
+  test("filter: on empty set") {
+    new TestSets {
+      assert(size(set1.filter(tw => tw.user == "a")) === 0)
+    }
+  }
+
+  test("filter: a on set5") {
+    new TestSets {
+      assert(size(set5.filter(tw => tw.user == "a")) === 1)
+    }
+  }
+
+  test("filter: 20 on set5") {
+    new TestSets {
+      assert(size(set5.filter(tw => tw.retweets == 20)) === 2)
+    }
+  }
+
+  test("union: set4c and set4d") {
+    new TestSets {
+      assert(size(set4c.union(set4d)) === 4)
+    }
+  }
+
+  test("union: with empty set (1)") {
+    new TestSets {
+      assert(size(set5.union(set1)) === 4)
+    }
+  }
+
+  test("union: with empty set (2)") {
+    new TestSets {
+      assert(size(set1.union(set5)) === 4)
+    }
+  }
+
+  test("descending: set5") {
+    new TestSets {
+      val trends = set5.descendingByRetweet
+      assert(!trends.isEmpty)
+      assert(trends.head.user == "a" || trends.head.user == "b")
+    }
+  }
+}