Add code coverage for File logger

logger/log_test.go

@@ -3,10 +3,12 @@ package logger
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"log"
 	"os"
+	"strings"
 	"testing"
 )
 
@@ -94,6 +96,9 @@ func TestFileLogger(t *testing.T) {
 	defer os.RemoveAll(tmpDir)
 
 	file, err := ioutil.TempFile(tmpDir, "gnatsd:log_")
+	if err != nil {
+		t.Fatalf("Could not create the temp file: %v", err)
+	}
 	file.Close()
 
 	logger := NewFileLogger(file.Name(), false, false, false, false)
@@ -110,6 +115,38 @@ func TestFileLogger(t *testing.T) {
 	if string(buf) != "[INF] foo\n" {
 		t.Fatalf("Expected '%s', received '%s'\n", "[INFO] foo", string(buf))
 	}
+
+	file, err = ioutil.TempFile(tmpDir, "gnatsd:log_")
+	if err != nil {
+		t.Fatalf("Could not create the temp file: %v", err)
+	}
+	file.Close()
+
+	logger = NewFileLogger(file.Name(), true, true, true, true)
+	logger.Errorf("foo")
+
+	buf, err = ioutil.ReadFile(file.Name())
+	if err != nil {
+		t.Fatalf("Could not read logfile: %v", err)
+	}
+	if len(buf) <= 0 {
+		t.Fatal("Expected a non-zero length logfile")
+	}
+	str := string(buf)
+	errMsg := fmt.Sprintf("Expected '%s', received '%s'\n", "[pid] <date> [ERR] foo", str)
+	pidEnd := strings.Index(str, " ")
+	infoStart := strings.LastIndex(str, "[ERR]")
+	if pidEnd == -1 || infoStart == -1 {
+		t.Fatalf("%v", errMsg)
+	}
+	pid := str[0:pidEnd]
+	if pid[0] != '[' || pid[len(pid)-1] != ']' {
+		t.Fatalf("%v", errMsg)
+	}
+	//TODO: Parse date.
+	if !strings.HasSuffix(str, "[ERR] foo\n") {
+		t.Fatalf("%v", errMsg)
+	}
 }
 
 func expectOutput(t *testing.T, f func(), expected string) {