Refactor config package

- Parse configuration only once during startup time
- Store configuration values in a global variable

config/parser_test.go

@@ -0,0 +1,79 @@
+// Copyright 2019 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package config // import "miniflux.app/config"
+
+import (
+	"os"
+	"testing"
+)
+
+func TestGetBooleanValueWithUnsetVariable(t *testing.T) {
+	os.Clearenv()
+	if getBooleanValue("MY_TEST_VARIABLE") {
+		t.Errorf(`Unset variables should returns false`)
+	}
+}
+
+func TestGetBooleanValue(t *testing.T) {
+	scenarios := map[string]bool{
+		"":        false,
+		"1":       true,
+		"Yes":     true,
+		"yes":     true,
+		"True":    true,
+		"true":    true,
+		"on":      true,
+		"false":   false,
+		"off":     false,
+		"invalid": false,
+	}
+
+	for input, expected := range scenarios {
+		os.Clearenv()
+		os.Setenv("MY_TEST_VARIABLE", input)
+		result := getBooleanValue("MY_TEST_VARIABLE")
+		if result != expected {
+			t.Errorf(`Unexpected result for %q, got %v instead of %v`, input, result, expected)
+		}
+	}
+}
+
+func TestGetStringValueWithUnsetVariable(t *testing.T) {
+	os.Clearenv()
+	if getStringValue("MY_TEST_VARIABLE", "defaultValue") != "defaultValue" {
+		t.Errorf(`Unset variables should returns the default value`)
+	}
+}
+
+func TestGetStringValue(t *testing.T) {
+	os.Clearenv()
+	os.Setenv("MY_TEST_VARIABLE", "test")
+	if getStringValue("MY_TEST_VARIABLE", "defaultValue") != "test" {
+		t.Errorf(`Defined variables should returns the specified value`)
+	}
+}
+
+func TestGetIntValueWithUnsetVariable(t *testing.T) {
+	os.Clearenv()
+	if getIntValue("MY_TEST_VARIABLE", 42) != 42 {
+		t.Errorf(`Unset variables should returns the default value`)
+	}
+}
+
+func TestGetIntValueWithInvalidInput(t *testing.T) {
+	os.Clearenv()
+	os.Setenv("MY_TEST_VARIABLE", "invalid integer")
+	if getIntValue("MY_TEST_VARIABLE", 42) != 42 {
+		t.Errorf(`Invalid integer should returns the default value`)
+	}
+}
+
+func TestGetIntValue(t *testing.T) {
+	os.Clearenv()
+	os.Setenv("MY_TEST_VARIABLE", "2018")
+	if getIntValue("MY_TEST_VARIABLE", 42) != 2018 {
+		t.Errorf(`Defined variables should returns the specified value`)
+	}
+}