Add tests for asynqmon command binary

.gitignore

@@ -24,8 +24,9 @@ package-json.lock
 *.out
 
 # binaries
-asynqmon
+/cmd/asynqmon/asynqmon
-api
+/asynqmon
+/api
 dist/
 
 # Editor configs

cmd/asynqmon/main_test.go

@@ -0,0 +1,125 @@
+package main
+
+import (
+	"crypto/tls"
+	"strings"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+	"github.com/hibiken/asynq"
+)
+
+func TestParseFlags(t *testing.T) {
+	tests := []struct {
+		args []string
+		want *Config
+	}{
+		{
+			args: []string{"--redis-addr", "localhost:6380", "--redis-db", "3"},
+			want: &Config{
+				RedisAddr: "localhost:6380",
+				RedisDB:   3,
+
+				// Default values
+				Port:                  8080,
+				RedisPassword:         "",
+				RedisTLS:              "",
+				RedisURL:              "",
+				RedisInsecureTLS:      false,
+				RedisClusterNodes:     "",
+				MaxPayloadLength:      200,
+				MaxResultLength:       200,
+				EnableMetricsExporter: false,
+				PrometheusServerAddr:  "",
+				ReadOnly:              false,
+
+				Args: []string{},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(strings.Join(tc.args, " "), func(t *testing.T) {
+			cfg, output, err := parseFlags("asynqmon", tc.args)
+			if err != nil {
+				t.Errorf("parseFlags returned error: %v", err)
+			}
+			if output != "" {
+				t.Errorf("parseFlag returned output=%q, want empty", output)
+			}
+			if diff := cmp.Diff(tc.want, cfg); diff != "" {
+				t.Errorf("parseFlag returned Config %v, want %v; (-want,+got)\n%s", cfg, tc.want, diff)
+			}
+		})
+	}
+
+}
+
+func TestMakeRedisConnOpt(t *testing.T) {
+	var tests = []struct {
+		desc string
+		cfg  *Config
+		want asynq.RedisConnOpt
+	}{
+		{
+			desc: "With address, db number and password",
+			cfg: &Config{
+				RedisAddr:     "localhost:6380",
+				RedisDB:       1,
+				RedisPassword: "foo",
+			},
+			want: asynq.RedisClientOpt{
+				Addr:     "localhost:6380",
+				DB:       1,
+				Password: "foo",
+			},
+		},
+		{
+			desc: "With TLS server name",
+			cfg: &Config{
+				RedisAddr: "localhost:6379",
+				RedisTLS:  "foobar",
+			},
+			want: asynq.RedisClientOpt{
+				Addr:      "localhost:6379",
+				TLSConfig: &tls.Config{ServerName: "foobar"},
+			},
+		},
+		{
+			desc: "With redis URL",
+			cfg: &Config{
+				RedisURL: "redis://:bar@localhost:6381/2",
+			},
+			want: asynq.RedisClientOpt{
+				Addr:     "localhost:6381",
+				DB:       2,
+				Password: "bar",
+			},
+		},
+		{
+			desc: "With cluster nodes",
+			cfg: &Config{
+				RedisClusterNodes: "localhost:5000,localhost:5001,localhost:5002,localhost:5003,localhost:5004,localhost:5005",
+			},
+			want: asynq.RedisClusterClientOpt{
+				Addrs: []string{
+					"localhost:5000", "localhost:5001", "localhost:5002", "localhost:5003", "localhost:5004", "localhost:5005"},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.desc, func(t *testing.T) {
+			got, err := makeRedisConnOpt(tc.cfg)
+			if err != nil {
+				t.Fatalf("makeRedisConnOpt returned error: %v", err)
+			}
+
+			if diff := cmp.Diff(tc.want, got, cmpopts.IgnoreUnexported(tls.Config{})); diff != "" {
+				t.Errorf("diff found: want=%v, got=%v; (-want,+got)\n%s",
+					tc.want, got, diff)
+			}
+		})
+	}
+}