Add additional tests for #365

testing more edge cases.

Signed-off-by: Matthias Rampke <matthias@prometheus.io>

pkg/mapper/mapper_test.go

@@ -338,7 +338,7 @@ mappings:
 			},
 		},
 		{
-			testName: "Match metric segment starting with a number",
+			testName: "Match metric segment with a number",
 			config: `
 mappings:
 - match: test.99.myapp.*
@@ -357,7 +357,26 @@ mappings:
 			},
 		},
 		{
-			testName: "Match metric segment starting with a number #328 example",
+			testName: "Match metric segment starting with a number",
+			config: `
+mappings:
+- match: test.99test.myapp.*
+  name: "name"
+  labels:
+    label: "${1}_foo"
+  `,
+			mappings: mappings{
+				{
+					statsdMetric: "test.99test.myapp.create",
+					name:         "name",
+					labels: map[string]string{
+						"label": "create_foo",
+					},
+				},
+			},
+		},
+		{
+			testName: "Match metric segment with a number #328 example",
 			config: `
 mappings:
 - match: kafka.server.FetcherStats.brokerHost.hostname.brokerPort.9092.clientId.ReplicaFetcherThread-0-1.BytesPerSec.1MinuteRate.gauge
@@ -370,6 +389,25 @@ mappings:
 				},
 			},
 		},
+		{
+			testName: "Single segment match",
+			config: `
+mappings:
+- match: '*'
+  name: single_segment
+  labels:
+    label: "${1}"
+`,
+			mappings: mappings{
+				{
+					statsdMetric: "test",
+					name:         "single_segment",
+					labels: map[string]string{
+						"label": "test",
+					},
+				},
+			},
+		},
 		{
 			testName: "Config with bad metric line",
 			config: `---