lib/protoparser/graphite: add more tests after eb45185eef

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/610

lib/protoparser/graphite/parser_test.go

@@ -86,6 +86,13 @@ func TestRowsUnmarshalSuccess(t *testing.T) {
 			Value:  1123,
 		}},
 	})
+	f("aaa 1123 -1", &Rows{
+		Rows: []Row{{
+			Metric: "aaa",
+			Value:  1123,
+			Timestamp: -1,
+		}},
+	})
 
 	// Timestamp bigger than 1<<31
 	f("aaa 1123 429496729600", &Rows{
@@ -177,13 +184,42 @@ func Test_streamContext_Read(t *testing.T) {
 		}
 	}
 
-	// -1 timestamp
+	// Full line without tags
-	currentTimestamp := int64(fasttime.UnixTimestamp())
+	f("aaa 1123 345", &Rows{
+		Rows: []Row{{
+			Metric:    "aaa",
+			Value:     1123,
+			Timestamp: 345*1000,
+		}},
+	})
+	// Full line with tags
+	f("aaa;x=y 1123 345", &Rows{
+		Rows: []Row{{
+			Metric:    "aaa",
+			Tags: []Tag{{
+				Key: "x",
+				Value: "y",
+			}},
+			Value:     1123,
+			Timestamp: 345*1000,
+		}},
+	})
+	// missing timestamp.
+	// Note that this test may be flaky due to timing issues. TODO: fix it
 	f("aaa 1123", &Rows{
 		Rows: []Row{{
 			Metric:    "aaa",
 			Value:     1123,
-			Timestamp: currentTimestamp * 1000,
+			Timestamp: int64(fasttime.UnixTimestamp()) * 1000,
+		}},
+	})
+	// -1 timestamp. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/610
+	// Note that this test may be flaky due to timing issues. TODO: fix it.
+	f("aaa 1123 -1", &Rows{
+		Rows: []Row{{
+			Metric:    "aaa",
+			Value:     1123,
+			Timestamp: int64(fasttime.UnixTimestamp()) * 1000,
 		}},
 	})
 }