new feature: users are now able to provide more file types to convert by adding entries in their configuration file (#3)

* new feature: users are now able to provide more file types to convert by adding entries in their configuration file

* removing README blueprint: was not working correctly

* improving code coverage of config package

app/config/parser_test.go

@@ -0,0 +1,62 @@
+package config
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func load(configurationFilePath string) error {
+	Reset()
+	return ParseFile(configurationFilePath)
+}
+
+func TestParseFile(t *testing.T) {
+	var path string
+
+	// case 1: uses an empty configuration file path.
+	if err := load(""); err == nil {
+		t.Error("Configuration should not have been populated by using an empty configuration file path")
+	}
+
+	// case 2: uses a broken configuration file.
+	path, _ = filepath.Abs("../../_tests/configurations/broken-gotenberg.yml")
+	if err := load(path); err == nil {
+		t.Errorf("Configuration should not have been populated with '%s'", path)
+	}
+
+	// case 3: uses a configuration file with a wrong logging level.
+	path, _ = filepath.Abs("../../_tests/configurations/wrong-logging-level-gotenberg.yml")
+	if err := load(path); err == nil {
+		t.Errorf("Configuration should not have been populated with '%s'", path)
+	}
+
+	// case 4: uses a configuration file with a wrong logging formatter.
+	path, _ = filepath.Abs("../../_tests/configurations/wrong-logging-formatter-gotenberg.yml")
+	if err := load(path); err == nil {
+		t.Errorf("Configuration should not have been populated with '%s'", path)
+	}
+
+	// case 5: uses a configuration file with a wrong merge command template.
+	path, _ = filepath.Abs("../../_tests/configurations/wrong-merge-command-template-gotenberg.yml")
+	if err := load(path); err == nil {
+		t.Errorf("Configuration should not have been populated with '%s'", path)
+	}
+
+	// case 6: uses a configuration file with a wrong command template.
+	path, _ = filepath.Abs("../../_tests/configurations/wrong-command-template-gotenberg.yml")
+	if err := load(path); err == nil {
+		t.Errorf("Configuration should not have been populated with '%s'", path)
+	}
+
+	// case 7: uses a configuration file with a duplicate command.
+	path, _ = filepath.Abs("../../_tests/configurations/duplicate-command-gotenberg.yml")
+	if err := load(path); err == nil {
+		t.Errorf("Configuration should not have been populated with '%s'", path)
+	}
+
+	// case 8: uses a correct configuration file.
+	path, _ = filepath.Abs("../../_tests/configurations/gotenberg.yml")
+	if err := load(path); err != nil {
+		t.Errorf("Configuration should have been populated with '%s'", path)
+	}
+}