From 8103328051847a536eb8d57e6f1f9a947fd9ce19 Mon Sep 17 00:00:00 2001
From: Joe Adams <github@joeadams.io>
Date: Sat, 28 Sep 2024 11:29:21 -0400
Subject: [PATCH] Add tests for shards collector

Signed-off-by: Joe Adams <github@joeadams.io>
---
 collector/shards_test.go    | 84 +++++++++++++++++++++++++++++++++++++
 fixtures/shards/7.15.0.json |  1 +
 2 files changed, 85 insertions(+)
 create mode 100644 collector/shards_test.go
 create mode 100644 fixtures/shards/7.15.0.json

diff --git a/collector/shards_test.go b/collector/shards_test.go
new file mode 100644
index 00000000..73aec9ed
--- /dev/null
+++ b/collector/shards_test.go
@@ -0,0 +1,84 @@
+// Copyright 2024 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package collector
+
+import (
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"path"
+	"strings"
+	"testing"
+
+	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus/testutil"
+)
+
+func TestShards(t *testing.T) {
+	// Testcases created using:
+	// docker run --rm -d -p 9200:9200 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:$VERSION
+	// curl -XPUT http://localhost:9200/testindex
+	// curl -XPUT http://localhost:9200/otherindex
+	// curl http://localhost:9200/_cat/shards?format=json > fixtures/shards/$VERSION.json
+
+	tests := []struct {
+		name string
+		file string
+		want string
+	}{
+		{
+			name: "7.15.0",
+			file: "7.15.0.json",
+			want: `# HELP elasticsearch_node_shards_json_parse_failures Number of errors while parsing JSON.
+             # TYPE elasticsearch_node_shards_json_parse_failures counter
+             elasticsearch_node_shards_json_parse_failures 0
+             # HELP elasticsearch_node_shards_total Total shards per node
+             # TYPE elasticsearch_node_shards_total gauge
+             elasticsearch_node_shards_total{cluster="unknown_cluster",node="35dfca79831a"} 3
+						 `,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			f, err := os.Open(path.Join("../fixtures/shards/", tt.file))
+			if err != nil {
+				t.Fatal(err)
+			}
+			defer f.Close()
+
+			ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				io.Copy(w, f)
+			}))
+			defer ts.Close()
+
+			u, err := url.Parse(ts.URL)
+			if err != nil {
+				t.Fatalf("Failed to parse URL: %s", err)
+			}
+
+			s := NewShards(log.NewNopLogger(), http.DefaultClient, u)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			if err := testutil.CollectAndCompare(s, strings.NewReader(tt.want)); err != nil {
+				t.Fatal(err)
+			}
+		})
+
+	}
+}
diff --git a/fixtures/shards/7.15.0.json b/fixtures/shards/7.15.0.json
new file mode 100644
index 00000000..2e78aa6e
--- /dev/null
+++ b/fixtures/shards/7.15.0.json
@@ -0,0 +1 @@
+[{"index":".geoip_databases","shard":"0","prirep":"p","state":"STARTED","docs":"38","store":"36.4mb","ip":"172.17.0.2","node":"35dfca79831a"},{"index":"otherindex","shard":"0","prirep":"p","state":"STARTED","docs":"0","store":"208b","ip":"172.17.0.2","node":"35dfca79831a"},{"index":"otherindex","shard":"0","prirep":"r","state":"UNASSIGNED","docs":null,"store":null,"ip":null,"node":null},{"index":"testindex","shard":"0","prirep":"p","state":"STARTED","docs":"0","store":"208b","ip":"172.17.0.2","node":"35dfca79831a"},{"index":"testindex","shard":"0","prirep":"r","state":"UNASSIGNED","docs":null,"store":null,"ip":null,"node":null}]
\ No newline at end of file