Added Unit Test for EventBuffer class

Author: Haripriya Dhanasekaran

CMakeLists.txt

@@ -363,6 +363,7 @@ add_executable(tests
 	Testing/UnitTesting/GraphManagerTests.cpp
         Testing/Utils/ParameterManagerTests.cpp
         Testing/Utils/CircularBufferTests.cpp
+        Testing/UnitTesting/EventBufferTests.cpp
         Testing/UnitTesting/XmlRecorderTests.cpp
         Testing/UnitTesting/Hdf5RecorderTests.cpp)
 

Testing/UnitTesting/EventBufferTests.cpp

@@ -0,0 +1,52 @@
+/**
+ * @file EventBufferTests.cpp
+ *
+ * @brief This file contains the unit tests for EventBuffer using GTest.
+ *
+ * @ingroup Testing/UnitTesting
+ */
+
+#include "gtest/gtest.h"
+#include "EventBuffer.h"
+
+// A buffer which can hold 5 elements
+EventBuffer buffer(5);
+
+//GetElement when buffer is empty
+//Assuming getElement() returns uint64_t 
+TEST(EventBufferTest, GetElementFromEmptyBuffer)
+{
+    EXPECT_EQ(std::get<uint64_t>(buffer.getElement(0)), std::numeric_limits<unsigned long>::max());
+}
+
+// GetPastEvent when buffer is empty
+TEST(EventBufferTest, GetPastEventFromEmptyBuffer)
+{
+    EXPECT_EQ(buffer.getPastEvent(-1), std::numeric_limits<unsigned long>::max());
+}
+
+// Insert into empty buffer
+TEST(EventBufferTest, InsertEventEmptyBuffer) {
+    buffer.insertEvent(10);
+    buffer.insertEvent(20);
+
+    EXPECT_EQ(std::get<uint64_t>(buffer.getElement(0)), 10);
+    EXPECT_EQ(std::get<uint64_t>(buffer.getElement(1)), 20);
+}
+
+// Insert when buffer is full, test wrap around
+TEST(EventBufferTest, BufferWrapAround) {
+    buffer.insertEvent(30);
+    buffer.insertEvent(40);
+    buffer.insertEvent(50);
+
+    //Insert into A full buffer
+    buffer.insertEvent(60);
+
+    // The buffer should have overwritten 60 inplace of 10
+    EXPECT_EQ(std::get<uint64_t>(buffer.getElement(0)), 60);
+    EXPECT_EQ(std::get<uint64_t>(buffer.getElement(1)), 20);
+    EXPECT_EQ(std::get<uint64_t>(buffer.getElement(2)), 30);
+    EXPECT_EQ(std::get<uint64_t>(buffer.getElement(3)), 40);
+    EXPECT_EQ(std::get<uint64_t>(buffer.getElement(4)), 50);
+}