diff -N SlopeInterceptLineFitterTest.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ SlopeInterceptLineFitterTest.java	28 Mar 2006 04:51:18 -0000	1.1
@@ -0,0 +1,63 @@

+/*
+ * SlopeInterceptLineFitterTest.java
+ *
+ * Created on March 27, 2006, 7:35 PM
+ *
+ * $Id: SlopeInterceptLineFitterTest.java,v 1.1 2006/03/28 04:51:18 ngraf Exp $
+ */
+
+package org.lcsim.fit.line;
+
+import java.util.Random;
+import junit.framework.TestCase;
+
+/**
+ *
+ * @author Norman Graf
+ */
+public class SlopeInterceptLineFitterTest extends TestCase
+{
+    
+    /** Creates a new instance of SlopeInterceptLineFitterTest */
+    public void testSlopeInterceptLineFitter()
+    {
+        Random r = new Random();
+        SlopeInterceptLineFitter fitter = new SlopeInterceptLineFitter();
+        double[] pars = {8.2, 1.5};
+        int npoints = 10;
+        int nparams = pars.length;
+        double[] x = new double[npoints];
+        double[] y = new double[npoints];
+        double[] sigma = new double[npoints];
+        double eps = .01;
+        
+        double x0 = 0.;
+        double delta = 1.;
+        for(int i = 0; i<npoints; ++i)
+        {
+            x[i] = x0+i*delta;
+            
+            for(int j=0; j<pars.length; ++j)
+            {
+                y[i]+=pars[j]*Math.pow(x[i], j);
+            }
+            // now smear the measurement
+            y[i]+=r.nextGaussian()*eps;
+            sigma[i] = eps;
+        }
+        
+        boolean success = fitter.fit(x, y, sigma, npoints);
+        assertTrue(success);
+        SlopeInterceptLineFit fit = fitter.getFit();
+        System.out.println(fit);
+        double slope = fit.slope();
+        double slopeErr = fit.slopeUncertainty();
+
+        assertEquals(pars[1],slope,5*slopeErr);
+        
+        double b = fit.intercept();
+        double bErr = fit.interceptUncertainty();
+        System.out.println(b+" +/- "+bErr);
+        assertEquals(pars[0],b, 5*bErr);   
+    }
+}