Added average HR calculations to SdAlgHR - SdAlgHR still needs to be commissioned in SdDataSource class so it is used though.

app/src/test/java/uk/org/openseizuredetector/CircBufTest.java

@@ -0,0 +1,103 @@
+package uk.org.openseizuredetector;
+
+import junit.framework.TestCase;
+
+public class CircBufTest extends TestCase {
+    private CircBuf mCb;
+
+    public void setUp() throws Exception {
+        super.setUp();
+        mCb = new CircBuf(10, -1);
+    }
+
+    public void tearDown() throws Exception {
+    }
+
+    public void printArr(double[] arr) {
+        for (int n=0; n<arr.length; n++) {
+            System.out.println("arr["+n+"] = "+arr[n]);
+        }
+    }
+
+    public void testAdd() {
+        double[] retArr;
+
+        // Add a single value = we should get a single element array back.
+        mCb.add(1);
+        retArr = mCb.getVals();
+        assertEquals(1,retArr.length);
+
+        // Add 9 more elements - we should get a 10 element array back.
+        for (int i=0; i<9;i++) {
+            mCb.add(i);
+        }
+        retArr = mCb.getVals();
+        assertEquals(10,retArr.length);
+
+
+    }
+
+    public void testGetVals() {
+        double[] retArr;
+        // Add 10 more elements - we should get a 10 element array back.
+        for (int i=0; i<10;i++) {
+            mCb.add(i);
+        }
+        retArr = mCb.getVals();
+        assertEquals(0.0, retArr[0]);
+        assertEquals(9.0, retArr[9]);
+
+        //add one more element
+        mCb.add(10.0);
+        retArr = mCb.getVals();
+        printArr(retArr);
+        assertEquals(1.0, retArr[0]);
+        assertEquals(10.0, retArr[9]);
+
+        //add one more element
+        mCb.add(10.0);
+        retArr = mCb.getVals();
+        printArr(retArr);
+        assertEquals(2.0, retArr[0]);
+        assertEquals(10.0, retArr[9]);
+
+    }
+
+    public void testGetAverageVal() {
+        double[] retArr;
+        double avVal;
+
+        // empty array;
+        avVal = mCb.getAverageVal();
+        assertEquals(-1.0, avVal, 1e-5);
+
+
+
+        // A trivial example
+        for (int i=0; i<10;i++) {
+            mCb.add(1.0);
+        }
+        retArr = mCb.getVals();
+        avVal = mCb.getAverageVal();
+        assertEquals(1.0, avVal,1e-5);
+
+        // Real calculation
+        double sum = 0.0;
+        for (int i=0; i<10;i++) {
+            mCb.add(i);
+            sum += i;
+        }
+        avVal = mCb.getAverageVal();
+        assertEquals(sum/10, avVal, 1e-5);
+
+        // Error value in array - should now be average of 9 values between 1 and 9 (because zero value is removed when -1 is added to end).
+        sum = 0.0;
+        for(int i=1;i<10;i++)
+            sum+= i;
+
+        mCb.add(-1.0);
+        avVal = mCb.getAverageVal();
+        assertEquals(sum/9, avVal, 1e-5);
+
+    }
+}