Add tests for unmarshalling union types

Signed-off-by: Dan Sun <dsun20@bloomberg.net>

go.mod

@@ -10,8 +10,8 @@ require (
 	github.com/aws/aws-sdk-go-v2/config v1.28.7
 	github.com/envoyproxy/gateway v1.2.4
 	github.com/envoyproxy/go-control-plane/envoy v1.32.2
-	github.com/openai/openai-go v0.1.0-alpha.43
 	github.com/google/go-cmp v0.6.0
+	github.com/openai/openai-go v0.1.0-alpha.43
 	github.com/stretchr/testify v1.10.0
 	golang.org/x/exp v0.0.0-20240904232852-e7e105dedf7e
 	google.golang.org/grpc v1.69.2

internal/apischema/awsbedrock/awsbedrock.go

@@ -6,28 +6,28 @@ import (
 )
 
 const (
-	// StopReasonEndTurn is a StopReason enum value
+	// StopReasonEndTurn is a StopReason enum value.
 	StopReasonEndTurn = "end_turn"
 
-	// StopReasonToolUse is a StopReason enum value
+	// StopReasonToolUse is a StopReason enum value.
 	StopReasonToolUse = "tool_use"
 
-	// StopReasonMaxTokens is a StopReason enum value
+	// StopReasonMaxTokens is a StopReason enum value.
 	StopReasonMaxTokens = "max_tokens"
 
-	// StopReasonStopSequence is a StopReason enum value
+	// StopReasonStopSequence is a StopReason enum value.
 	StopReasonStopSequence = "stop_sequence"
 
-	// StopReasonGuardrailIntervened is a StopReason enum value
+	// StopReasonGuardrailIntervened is a StopReason enum value.
 	StopReasonGuardrailIntervened = "guardrail_intervened"
 
-	// StopReasonContentFiltered is a StopReason enum value
+	// StopReasonContentFiltered is a StopReason enum value.
 	StopReasonContentFiltered = "content_filtered"
 
-	// ConversationRoleUser is a ConversationRole enum value
+	// ConversationRoleUser is a ConversationRole enum value.
 	ConversationRoleUser = "user"
 
-	// ConversationRoleAssistant is a ConversationRole enum value
+	// ConversationRoleAssistant is a ConversationRole enum value.
 	ConversationRoleAssistant = "assistant"
 )
 
@@ -441,7 +441,7 @@ type Tool struct {
 	ToolSpec *ToolSpecification `json:"toolSpec"`
 }
 
-// ToolInputSchema The schema for the tool. The top level schema type must be object.
+// ToolInputSchema The schema for the tool. The top level schema type must be an object.
 type ToolInputSchema struct {
 	JSON any `json:"json"`
 }