diff --git a/knn/knn_test.go b/knn/knn_test.go
index 6c3fd12f..ddf1834e 100644
--- a/knn/knn_test.go
+++ b/knn/knn_test.go
@@ -65,3 +65,17 @@ func TestKnnClassifierWithOptimisations(t *testing.T) {
 		})
 	})
 }
+
+func TestKnnClassifierWithOptimisationsPartiallyComplete(t *testing.T) {
+	Convey("Given two basically identical files...", t, func() {
+		trainingData, err := base.ParseCSVToInstances("knn_train_2.csv", true)
+		So(err, ShouldBeNil)
+		testingData, err := base.ParseCSVToInstances("knn_test_2.csv", true)
+		So(err, ShouldBeNil)
+
+		cls := NewKnnClassifier("euclidean", 2)
+		cls.Fit(trainingData)
+		predictions := cls.Predict(testingData)
+		So(predictions, ShouldNotBeNil)
+	})
+}
diff --git a/knn/knn_test_2.csv b/knn/knn_test_2.csv
new file mode 100644
index 00000000..797ad035
--- /dev/null
+++ b/knn/knn_test_2.csv
@@ -0,0 +1,3 @@
+weather,hours_of_daylight,number_of_customers
+cloudy,10.1,0
+sunny,10.1,0
diff --git a/knn/knn_train_2.csv b/knn/knn_train_2.csv
new file mode 100644
index 00000000..3dfb125f
--- /dev/null
+++ b/knn/knn_train_2.csv
@@ -0,0 +1,5 @@
+weather,hours_of_daylight,number_of_customers
+sunny,10.5,200
+sunny,10.1,188
+cloudy,10.0,150
+cloudy,8.5,100