diff --git a/app/build.gradle b/app/build.gradle
index 43b901f..46e8d09 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -20,6 +20,9 @@ android {
 
     testOptions {
         unitTests.returnDefaultValues = true
+        unitTests {
+            includeAndroidResources = true
+        }
     }
 }
 
@@ -42,6 +45,7 @@ dependencies {
     implementation 'com.github.wendykierp:JTransforms:3.0'
     implementation 'com.google.android.gms:play-services-location:10.0.0'
     //implementation 'com.github.RohitSurwase.UCE-Handler:uce_handler:1.3'
+    testImplementation 'org.robolectric:robolectric:4.3'
 
 }
 
diff --git a/app/src/test/java/uk/org/openseizuredetector/SdAnalyserTest.java b/app/src/test/java/uk/org/openseizuredetector/SdAnalyserTest.java
index 35b483e..a6cfb8c 100644
--- a/app/src/test/java/uk/org/openseizuredetector/SdAnalyserTest.java
+++ b/app/src/test/java/uk/org/openseizuredetector/SdAnalyserTest.java
@@ -3,14 +3,17 @@ package uk.org.openseizuredetector;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
 
 import static org.junit.Assert.*;
 
+@RunWith(RobolectricTestRunner.class)
 public class SdAnalyserTest {
     public SdAnalyser sda;
 
-    public String alarmJSON = "{ dataType: 'raw', " +
-            "data: [" +
+    public String alarmJSON = "{ 'dataType': 'raw', " +
+            "'data': [" +
             "1644, 1316, 1144, 1332, 1716, 1716, 1392, 1148, 1276, 1660, " +
             "1716, 1496, 1196, 1232, 1572, 1684, 1552, 1236, 1228, 1528, " +
             "1648, 1572, 1268, 1208, 1492, 1680, 1596, 1272, 1192, 1424, " +
@@ -24,13 +27,13 @@ public class SdAnalyserTest {
             "1188, 1360, 1680, 1724, 1424, 1192, 1224, 1556, 1744, 1588, " +
             "1260, 1220, 1472, 1692, 1608, 1328, 1192, 1412, 1668, 1656, " +
             "1356, 1216, 1304, 1636, 1712], " +
-            "HR:54, " +
-            "Mute:0 " +
+            "'HR':54, " +
+            "'Mute':0 " +
             "}";
 
     private String okJSON = "{ " +
-            "dataType: 'raw', " +
-            "data: [" +
+            "\"dataType\": \"raw\", " +
+            "\"data\": [" +
             "1140, 1188, 1144, 1172, 1228, 1212, 1236, 1236, 1256, 1320, " +
             "1316, 1280, 1240, 1280, 1324, 1284, 1292, 1268, 1284, 1276, " +
             "1296, 1324, 1308, 1288, 1304, 1276, 1304, 1304, 1276, 1296, " +
@@ -44,8 +47,8 @@ public class SdAnalyserTest {
             "1268, 1292, 1292, 1304, 1288, 1284, 1280, 1276, 1288, 1280, " +
             "1300, 1288, 1320, 1268, 1288, 1280, 1304, 1280, 1280, 1288, " +
             "1292, 1308, 1268, 1292, 1280], " +
-            "HR:57, " +
-            "Mute:0 " +
+            "\"HR\":57, " +
+            "\"Mute\":0 " +
             "}";
 
     @Before
@@ -65,7 +68,7 @@ public class SdAnalyserTest {
     }
 
     @Test
-    public void freq2fftBin() {
+    public void testFreq2fftBin() {
         int n;
         n = sda.freq2fftBin(0.0);
         assertEquals(0,n);
@@ -74,7 +77,7 @@ public class SdAnalyserTest {
     }
 
     @Test
-    public void getMagnitude() {
+    public void testGetMagnitude() {
         double[] fft = {1, 1,
                         2, 1,
                         2, 2};
@@ -87,4 +90,54 @@ public class SdAnalyserTest {
         assertEquals(8.0, m, m * 1e-4);
     }
 
+    @Test
+    public void testGetAccelDataFromJson() {
+        double[] retVal;
+
+        retVal = sda.getAccelDataFromJSON(okJSON);
+        assertNotNull(retVal);
+        assertEquals(125,retVal.length);
+        assertEquals(1140,retVal[0],0.001);
+        assertEquals(1280,retVal[124],0.001);
+    }
+
+
+    @Test
+    public void testGetSpectrumRatio() {
+        double[] okRawVals;
+        double[] alarmRawVals;
+        okRawVals = sda.getAccelDataFromJSON(okJSON);
+        alarmRawVals = sda.getAccelDataFromJSON(alarmJSON);
+
+        double okRatio;
+        double alarmRatio;
+
+        okRatio = sda.getSpectrumRatio(okRawVals);
+        alarmRatio = sda.getSpectrumRatio(alarmRawVals);
+
+        assertTrue("Check Spectrum Ratio for OK data "+okRatio+" is <="+sda.mAlarmRatioThresh,
+                okRatio <= sda.mAlarmRatioThresh);
+        assertTrue("Check Spectrum Ratio for ALARM data "+alarmRatio+" is >"+sda.mAlarmRatioThresh,
+                alarmRatio > sda.mAlarmRatioThresh);
+
+    }
+
+
+    @Test
+    public void testgetAlarmState() {
+        double[] okRawVals;
+        double[] alarmRawVals;
+        okRawVals = sda.getAccelDataFromJSON(okJSON);
+        alarmRawVals = sda.getAccelDataFromJSON(alarmJSON);
+
+        int okAlarmState;
+        int alarmAlarmState;
+
+        okAlarmState = sda.getAlarmState(okRawVals);
+        alarmAlarmState = sda.getAlarmState(alarmRawVals);
+
+        assertEquals("check OK start detected from raw data",0, okAlarmState);
+        assertEquals("check alarm state detected from raw data",1, alarmAlarmState);
+    }
+
 }
\ No newline at end of file