Resolve AWS credentials using default credentials provider chain for Bedrock (#1752)

tests/providers/bedrock_spec.lua

@@ -0,0 +1,43 @@
+local bedrock_provider = require("avante.providers.bedrock")
+
+describe("bedrock_provider", function()
+  describe("check_curl_version_supports_aws_sig", function()
+    it(
+      "should return true for curl version 8.10.0",
+      function()
+        assert.is_true(
+          bedrock_provider.check_curl_version_supports_aws_sig(
+            "curl 8.10.0 (x86_64-pc-linux-gnu) libcurl/7.68.0 OpenSSL/1.1.1f zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh2/1.8.0 nghttp2/1.40.0 librtmp/2.3"
+          )
+        )
+      end
+    )
+
+    it(
+      "should return true for curl version higher than 8.10.0",
+      function()
+        assert.is_true(
+          bedrock_provider.check_curl_version_supports_aws_sig(
+            "curl 8.11.0 (aarch64-apple-darwin23.6.0) libcurl/8.11.0 OpenSSL/3.4.0 (SecureTransport) zlib/1.2.12 brotli/1.1.0 zstd/1.5.6 AppleIDN libssh2/1.11.1 nghttp2/1.64.0 librtmp/2.3"
+          )
+        )
+      end
+    )
+
+    it(
+      "should return false for curl version lower than 8.10.0",
+      function()
+        assert.is_false(
+          bedrock_provider.check_curl_version_supports_aws_sig(
+            "curl 7.68.0 (x86_64-pc-linux-gnu) libcurl/7.68.0 OpenSSL/1.1.1f zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh2/1.8.0 nghttp2/1.40.0 librtmp/2.3"
+          )
+        )
+      end
+    )
+
+    it(
+      "should return false for invalid version string",
+      function() assert.is_false(bedrock_provider.check_curl_version_supports_aws_sig("Invalid version string")) end
+    )
+  end)
+end)