Fix mtime reporting in textfile collector, add tests.

collector/textfile_test.go

@@ -0,0 +1,57 @@
+package collector
+
+import (
+	"io/ioutil"
+	"sort"
+	"strings"
+	"testing"
+
+	"github.com/golang/protobuf/proto"
+)
+
+func TestParseTextFiles(t *testing.T) {
+	tests := []struct {
+		path string
+		out  string
+	}{
+		{
+			path: "fixtures/textfile/no_metric_files",
+			out:  "fixtures/textfile/no_metric_files.out",
+		},
+		{
+			path: "fixtures/textfile/two_metric_files",
+			out:  "fixtures/textfile/two_metric_files.out",
+		},
+		{
+			path: "fixtures/textfile/nonexistent_path",
+			out:  "fixtures/textfile/nonexistent_path.out",
+		},
+	}
+
+	for i, test := range tests {
+		c := textFileCollector{
+			path: test.path,
+		}
+
+		mfs := c.parseTextFiles()
+		textMFs := make([]string, 0, len(mfs))
+		for _, mf := range mfs {
+			if mf.GetName() == "node_textfile_mtime" {
+				mf.GetMetric()[0].GetGauge().Value = proto.Float64(1)
+				mf.GetMetric()[1].GetGauge().Value = proto.Float64(2)
+			}
+			textMFs = append(textMFs, proto.MarshalTextString(mf))
+		}
+		sort.Strings(textMFs)
+		got := strings.Join(textMFs, "")
+
+		want, err := ioutil.ReadFile(test.out)
+		if err != nil {
+			t.Fatalf("%d. error reading fixture file %s: %s", i, test.out, err)
+		}
+
+		if string(want) != got {
+			t.Fatalf("%d. want:\n\n%s\n\ngot:\n\n%s", i, string(want), got)
+		}
+	}
+}