Add Unit Tests (#4)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Create a report to help us improve
+title: '[Bug]:'
+labels: 'bug'
+assignees: ''
+
+---
+
+**<u>AgentScope-Samples is an open-source project. To involve a broader community, we recommend asking your questions in English.</u>**
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+1. You code
+2. How to execute
+3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Error messages**
+Detailed error messages.
+
+**Environment (please complete the following information):**
+
+- AgentScope-Samples
+- Python Version: [e.g. 3.10]
+- OS: [e.g. macos, windows]
+
+**Additional context**
+Add any other context about the problem here.