stream/mts/meta/meta_test.go: adding test for ReadFrom

stream/mts/meta/meta_test.go

@@ -42,6 +42,10 @@ const (
 	tstData3 = "d,e,f"
 )
 
+var (
+	errNotExpectedOut = "Did not get expected out. \nGot : %v, \nwant: %v"
+)
+
 // TestAddAndGet ensures that we can add metadata and then successfully get it.
 func TestAddAndGet(t *testing.T) {
 	meta := New()
@@ -145,6 +149,26 @@ func TestEncode(t *testing.T) {
 
 	got := meta.Encode()
 	if !bytes.Equal(expectedOut, got) {
-		t.Errorf("Did not get expected out. \nGot : %v \nwant: %v", got, expectedOut)
+		t.Errorf(errNotExpectedOut, got, expectedOut)
+	}
+}
+
+func TestReadFrom(t *testing.T) {
+	tstStr := "loc=a,b,c\tts=12345"
+	got, err := ReadFrom([]byte(tstStr), "loc")
+	if err != nil {
+		t.Errorf("Got unexpected error: %v", err.Error())
+	}
+	want := "a,b,c"
+	if got != want {
+		t.Errorf(errNotExpectedOut, got, want)
+	}
+
+	if got, err = ReadFrom([]byte(tstStr), "ts"); err != nil {
+		t.Errorf("Got unexpected error: %v", err.Error())
+	}
+	want = "12345"
+	if got != want {
+		t.Errorf(errNotExpectedOut, got, want)
 	}
 }