diff --git a/.codecov.yml b/.codecov.yml
index fe85313..2a6f25d 100644
--- a/.codecov.yml
+++ b/.codecov.yml
@@ -1,2 +1,7 @@
 ignore:
-  - "main.py"
\ No newline at end of file
+  - "main.py"
+
+status:
+project:
+  default:
+    target:90%
\ No newline at end of file
diff --git a/structure.py b/structure.py
index 5c268f5..e4ba74b 100644
--- a/structure.py
+++ b/structure.py
@@ -279,12 +279,12 @@ def NLateration(data, step=.1, xSize=0.0, ySize=0.0, zSize=0.0):
     :param zSize: The Z dimension of the cuboid containing all the emitters (automatically computed if not specified)
     '''
     minLoc = Location()
-    minDist = xMax = yMax = zMax = 0.0
+    minDist = 0.0
     for k in data:
         minDist += abs(k[0].distanceTo(Location()) - k[1])
-        xMax = k[0].x if k[0].x > xMax and not xSize else k[0].x
-        yMax = k[0].y if k[0].y > yMax and not ySize else k[0].y
-        zMax = k[0].z if k[0].z > zMax and not zSize else k[0].z
+        xSize = k[0].x if k[0].x > xSize  else xSize
+        ySize = k[0].y if k[0].y > ySize  else ySize
+        zSize = k[0].z if k[0].z > zSize  else zSize
     for k in arange(0.1,xSize,step):
         for l in arange(0.1,ySize,step):
             for m in arange(0.1,zSize,step):
@@ -294,4 +294,5 @@ def NLateration(data, step=.1, xSize=0.0, ySize=0.0, zSize=0.0):
                 if d < minDist:
                     minDist = d
                     minLoc = Location(round(k,2),round(l,2),round(m,2))
-    return (minLoc, minDist)
\ No newline at end of file
+    return (minLoc, minDist)
+    
\ No newline at end of file
diff --git a/test_structure.py b/test_structure.py
index 197e829..a5fb770 100644
--- a/test_structure.py
+++ b/test_structure.py
@@ -1,7 +1,9 @@
-from structure import KNeighbors, resolve_barycenter, Location, newCell, MarkovModel, RSSVector
+from structure import KNeighbors, resolve_barycenter, Location, newCell, MarkovModel, RSSVector, NLateration
 from io import StringIO
 import sys
 
+testEmitters = [(Location(.5,.5,.5), 3.0), (Location(4.0,.0,.0), 2.0), (Location(4.0,5.0,5.0), 4.2), (Location(3.0,3.0,3.0), 2.5)]
+
 Tf = [[newCell(-38,-27,-54,-13,2,2),newCell(-74,-62,-48,-33,2,6),newCell(-13,-28,-12,-40,2,10) ],\
       [newCell(-34,-27,-38,-41,6,2), newCell(-64,-48,-72,-35,6,6), newCell(-45,-37,-20,-15,6,10)], \
       [newCell(-17,-50,-44,-33,10,2), newCell(-27,-28,-32,-45,10,6), newCell(-30,-20,-60,-40,10,10)]]
@@ -97,7 +99,10 @@ def test_printPercentage():
       assert len(output.out) > 2000
       print(len(output.out))
 
-
+def test_NLateration():
+      test_result = NLateration(testEmitters)
+      assert test_result[0] == Location(3.3, 1.5, 1.1)
+      assert round(test_result[1],2) == 1.19
 class OutputBuffer(object):
 
     def __init__(self):
--
libgit2 0.21.4