From 60ffbcbb99507c5d88bdc857b02b3f43166d1ac6 Mon Sep 17 00:00:00 2001
From: Aliaksandr Valialkin <valyala@gmail.com>
Date: Mon, 3 May 2021 11:26:38 +0300
Subject: [PATCH] lib/promrelabel: add tests for removing the specified
 {label="value"} pair

---
 lib/promrelabel/relabel_test.go | 50 +++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/lib/promrelabel/relabel_test.go b/lib/promrelabel/relabel_test.go
index c8033877a8..58c51c81e4 100644
--- a/lib/promrelabel/relabel_test.go
+++ b/lib/promrelabel/relabel_test.go
@@ -121,6 +121,56 @@ func TestApplyRelabelConfigs(t *testing.T) {
 			},
 		})
 	})
+	t.Run("replace-remove-label-value-hit", func(t *testing.T) {
+		f(`
+- action: replace
+  source_labels: ["foo"]
+  target_label: "foo"
+  regex: "xxx"
+  replacement: ""
+`, []prompbmarshal.Label{
+			{
+				Name:  "foo",
+				Value: "xxx",
+			},
+			{
+				Name:  "bar",
+				Value: "baz",
+			},
+		}, false, []prompbmarshal.Label{
+			{
+				Name:  "bar",
+				Value: "baz",
+			},
+		})
+	})
+	t.Run("replace-remove-label-value-miss", func(t *testing.T) {
+		f(`
+- action: replace
+  source_labels: ["foo"]
+  target_label: "foo"
+  regex: "xxx"
+  replacement: ""
+`, []prompbmarshal.Label{
+			{
+				Name:  "foo",
+				Value: "yyy",
+			},
+			{
+				Name:  "bar",
+				Value: "baz",
+			},
+		}, false, []prompbmarshal.Label{
+			{
+				Name:  "bar",
+				Value: "baz",
+			},
+			{
+				Name:  "foo",
+				Value: "yyy",
+			},
+		})
+	})
 	t.Run("replace-hit-target-label-with-capture-group", func(t *testing.T) {
 		f(`
 - action: replace