feat(diagnose): Update Consul client to fetch health check output and display diagnostics

scripts/cluster_status/tests/test_formatter.py

@@ -29,3 +29,32 @@ def test_format_node_table():
     assert "node1" in table
     assert "primary" in table
     assert "passing" in table
+
+def test_format_diagnostics():
+    """Test the diagnostics section generation."""
+    nodes = [
+        {
+            "node": "node3",
+            "status": "critical",
+            "check_output": "500 Internal Error",
+            "litefs_error": "Connection Timeout"
+        }
+    ]
+    diagnostics = output_formatter.format_diagnostics(nodes, use_color=False)
+    assert "DIAGNOSTICS" in diagnostics
+    assert "node3" in diagnostics
+    assert "500 Internal Error" in diagnostics
+    assert "Connection Timeout" in diagnostics
+
+def test_format_diagnostics_empty():
+    """Test that diagnostics section is empty when no errors exist."""
+    nodes = [
+        {
+            "node": "node1",
+            "status": "passing",
+            "litefs_error": None
+        }
+    ]
+    diagnostics = output_formatter.format_diagnostics(nodes, use_color=False)
+    assert diagnostics == ""
+