Tests to prove GoVector's: pushfixed-handles-exception branch changes

Changed the PushFixed array code to not break if the array was expanded
by an external call to the standard Push function. The two functions can
now be called in a mixed fashion, and PushFixed will still attempt to
use as little memory as possible.

anomalyze_test.go

@@ -70,6 +70,33 @@ func TestAnomalyzerPushFixed(t *testing.T) {
 	assert.Equal(t, len(anomalyzer.Data), 6, "Array size did not stay at original size")
 }
 
+func TestAnomalyzerPushMixed(t *testing.T) {
+	conf := &AnomalyzerConf{
+		Sensitivity: 0.1,
+		UpperBound:  5,
+		LowerBound:  0,
+		ActiveSize:  1,
+		NSeasons:    4,
+		Methods:     []string{"cdf", "fence", "highrank", "lowrank", "magnitude"},
+	}
+
+	// initialize with empty data or an actual slice of floats
+	data := []float64{0.1, 2.05, 1.5, 2.5, 2.6, 2.55}
+
+	anomalyzer, err := NewAnomalyzer(conf, data)
+	assert.Equal(t, nil, err, "Error initializing new anomalyzer")
+
+	prob, err := anomalyzer.PushFixed(8.0)
+	prob = anomalyzer.Push(10.0)
+	prob, err = anomalyzer.PushFixed(8.0)
+	prob = anomalyzer.Push(9.0)
+	assert.Equal(t, err, nil, "There was an error with mixing array extension")
+	assert.Tf(t, prob > 0.5, "Anomalyzer returned a probability that was too small")
+	assert.Equal(t, len(anomalyzer.Data), 8, "Array size Push* functions failed to grow Data to expected size")
+	assert.Equal(t, anomalyzer.Data[7], 9.0)
+	assert.Equal(t, anomalyzer.Data[0], 1.5, "Two values were appended, two values were popped from the array. 3rd original element should be tail.")
+}
+
 func Example() {
 	conf := &AnomalyzerConf{
 		Sensitivity: 0.1,