Pipe profiling (#50)

This class helps profile pipelines by measuring individual pipe processing times

photon-server/src/test/java/org/photonvision/vision/pipeline/PipelineProfilerTest.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2020 Photon Vision.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.photonvision.vision.pipeline;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class PipelineProfilerTest {
+
+    @Test
+    public void reflectiveProfile() {
+        long[] invalidNanos = new long[10];
+        long[] validNanos = new long[PipelineProfiler.ReflectivePipeCount];
+
+        for (int i = 0; i < validNanos.length; i++) {
+            validNanos[i] = (long) (i * 1e+6); // fill data
+        }
+
+        var invalidResult = PipelineProfiler.getReflectiveProfileString(invalidNanos);
+        var validResult = PipelineProfiler.getReflectiveProfileString(validNanos);
+
+        Assertions.assertEquals("Invalid data", invalidResult);
+        Assertions.assertTrue(validResult.contains("Total: 171.0ms"));
+        System.out.println(validResult);
+    }
+}