Refactoring, improve code coverage (#72)

* Refactoring, improve code coverage

* Add unit test for gelAllFilesNameByDirName

* Add codecov coverage into README.md

* Improve coverage readFileBytesByFilePath

tracer/tracer_test.go

@@ -1,6 +1,7 @@
 package tracer
 
 import (
+	"github.com/prometheus/client_golang/prometheus"
 	"sync"
 	"testing"
 
@@ -10,7 +11,7 @@ import (
 func TestInit(t *testing.T) {
 	mockStrategy := func(event Event) {}
 
-	tracer := Init(mockStrategy)
+	tracer := GetInstance(mockStrategy)
 
 	assert.NotNil(t, tracer.strategy)
 }
@@ -25,7 +26,9 @@ func TestTraceEvent(t *testing.T) {
 		eventCalled = event
 	}
 
-	tracer := Init(mockStrategy)
+	tracer := GetInstance(mockStrategy)
+
+	tracer.strategy = mockStrategy
 
 	wg.Add(1)
 	tracer.TraceEvent(Event{
@@ -51,7 +54,7 @@ func TestSetStrategy(t *testing.T) {
 		eventCalled = event
 	}
 
-	tracer := Init(mockStrategy)
+	tracer := GetInstance(mockStrategy)
 
 	tracer.setStrategy(mockStrategy)
 
@@ -75,3 +78,42 @@ func TestStringStatus(t *testing.T) {
 	assert.Equal(t, Stateless.String(), "Stateless")
 	assert.Equal(t, Interaction.String(), "Interaction")
 }
+
+type mockCounter struct {
+	prometheus.Metric
+	prometheus.Collector
+	inc func()
+	add func(float64)
+}
+
+var counter = 0
+
+func (m mockCounter) Inc() {
+	counter += 1
+}
+
+func (m mockCounter) Add(f float64) {
+	counter = int(f)
+}
+
+func TestUpdatePrometheusCounters(t *testing.T) {
+	mockStrategy := func(event Event) {}
+
+	tracer := &tracer{
+		strategy:        mockStrategy,
+		eventsChan:      make(chan Event, Workers),
+		eventsTotal:     mockCounter{},
+		eventsSSHTotal:  mockCounter{},
+		eventsTCPTotal:  mockCounter{},
+		eventsHTTPTotal: mockCounter{},
+	}
+
+	tracer.updatePrometheusCounters(SSH.String())
+	assert.Equal(t, 2, counter)
+
+	tracer.updatePrometheusCounters(HTTP.String())
+	assert.Equal(t, 4, counter)
+
+	tracer.updatePrometheusCounters(TCP.String())
+	assert.Equal(t, 6, counter)
+}