fix: bedrock exception could be found at end of a stream (#2654)

tests/providers/bedrock_spec.lua

@@ -1,6 +1,37 @@
 local bedrock_provider = require("avante.providers.bedrock")
 
+local test_util = require("avante.utils.test")
+local Config = require("avante.config")
+Config.setup({})
+
 describe("bedrock_provider", function()
+  describe("parse_stream_data", function()
+    it("should parse response in a stream.", function()
+      local data = test_util.read_file("tests/data/bedrock_response_stream.bin")
+      local message = ""
+      bedrock_provider:parse_stream_data({}, data, {
+        on_chunk = function(msg) message = message .. msg end,
+        on_stop = function() end,
+      })
+      assert.equals(
+        "I'll help you fix errors in the HelloLog4j.java file. Let me first understand what errors might be present by examining the code and related files.",
+        message
+      )
+    end)
+
+    it("should parse exception inside a stream.", function()
+      local data = test_util.read_file("tests/data/bedrock_response_stream_with_exception.bin")
+      local message = ""
+      bedrock_provider:parse_stream_data({}, data, {
+        on_chunk = function(msg) message = msg end,
+      })
+      assert.equals(
+        "- Too many requests, please wait before trying again. You have sent too many requests.  Wait before trying again.",
+        message
+      )
+    end)
+  end)
+
   describe("check_curl_version_supports_aws_sig", function()
     it(
       "should return true for curl version 8.10.0",