chore: tests

.gitignore

@@ -4,7 +4,7 @@ vendor
 .idea
 .vscode
 repo_dump.txt
-opnix
+/opnix
 .crush
 .crush.json
 .gocache

cmd/opnix/env_command_test.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestParseEnvConfig_RejectsEmptyVars(t *testing.T) {
+	tests := []struct {
+		name string
+		json string
+	}{
+		{name: "explicit empty vars", json: `{"vars": []}`},
+		{name: "vars omitted", json: `{}`},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := parseEnvConfigString(tt.json)
+			if err == nil {
+				t.Fatal("expected error for empty vars")
+			}
+			if !strings.Contains(err.Error(), "at least one variable") {
+				t.Fatalf("expected validation error, got %v", err)
+			}
+		})
+	}
+}
+
+func TestParseEnvConfigString_EmptyInput(t *testing.T) {
+	_, err := parseEnvConfigString("   ")
+	if err == nil {
+		t.Fatal("expected error for empty JSON input")
+	}
+	if !strings.Contains(err.Error(), "cannot be empty") {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestEnvProcessorProcess_AllowsEmptyConfig(t *testing.T) {
+	t.Helper()
+
+	cfg := &envConfig{}
+
+	result, err := newEnvProcessor(staticResolver{}).Process(cfg)
+	if err != nil {
+		t.Fatalf("Process() error = %v", err)
+	}
+
+	if len(result.Values) != 0 {
+		t.Fatalf("len(result.Values) = %d, want 0", len(result.Values))
+	}
+
+	if len(result.Skipped) != 0 {
+		t.Fatalf("len(result.Skipped) = %d, want 0", len(result.Skipped))
+	}
+}
+
+func TestEnvProcessorProcess_NilConfig(t *testing.T) {
+	_, err := newEnvProcessor(staticResolver{}).Process(nil)
+	if err == nil {
+		t.Fatal("expected error for nil config")
+	}
+	if !strings.Contains(err.Error(), "cannot be nil") {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}