Add tests for config handling

config/config_test.go

@@ -0,0 +1,63 @@
+package config
+
+import (
+	"os"
+	"testing"
+	"time"
+)
+
+type flagNameTest struct {
+	env  string
+	flag string
+}
+
+var flagNameTests = []flagNameTest{
+	flagNameTest{env: "MyEnv", flag: "my.env"},
+	flagNameTest{env: "MyENV", flag: "my.env"},
+	flagNameTest{env: "MYEnv", flag: "myenv"},
+}
+
+func TestMakeFlagName(t *testing.T) {
+	for _, testCase := range flagNameTests {
+		generatedFlag := makeFlagName(testCase.env)
+		if generatedFlag != testCase.flag {
+			t.Errorf("Invalid flag name generated from env '%s', expected '%s', got '%s'", testCase.env, testCase.flag, generatedFlag)
+		}
+	}
+}
+
+func stringInSlice(stringArray []string, value string) bool {
+	for _, s := range stringArray {
+		if s == value {
+			return true
+		}
+	}
+	return false
+}
+
+func TestReadConfig(t *testing.T) {
+	os.Setenv("ALERTMANAGER_TTL", "1s")
+	os.Setenv("ALERTMANAGER_URI", "http://localhost")
+	os.Setenv("DEBUG", "true")
+	os.Setenv("COLOR_LABELS_STATIC", "a bb ccc")
+	Config.Read()
+	if Config.AlertmanagerTTL != time.Second {
+		t.Errorf("Config.AlertmanagerTTL is invalid, expected 1s, got %v", Config.AlertmanagerTTL)
+	}
+	if Config.Debug != true {
+		t.Errorf("Config.Debug is %v with env DEBUG=true set", Config.Debug)
+	}
+	if !stringInSlice(Config.ColorLabelsStatic, "a") {
+		t.Errorf("Config.ColorLabelsStatic is missing value 'a': %v", Config.ColorLabelsStatic)
+	}
+	if !stringInSlice(Config.ColorLabelsStatic, "bb") {
+		t.Errorf("Config.ColorLabelsStatic is missing value 'bb': %v", Config.ColorLabelsStatic)
+	}
+	if !stringInSlice(Config.ColorLabelsStatic, "ccc") {
+		t.Errorf("Config.ColorLabelsStatic is missing value 'ccc': %v", Config.ColorLabelsStatic)
+	}
+	if Config.Port != 8080 {
+		t.Errorf("Config.Port is invalid, expected 8080, got %v", Config.Port)
+	}
+
+}