openapi3: add a test for additionalProperties: false validation (#975)

* test: add a test for additionalProperties: false validation

* goimports

openapi3/issue82_test.go

@@ -0,0 +1,103 @@
+package openapi3
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestIssue82(t *testing.T) {
+	payload := map[string]interface{}{
+		"prop1": "val",
+		"prop3": "val",
+	}
+
+	schemas := []string{`
+{
+	"type": "object",
+	"additionalProperties": false,
+	"required": ["prop1"],
+	"properties": {
+		"prop1": {
+			"type": "string"
+		}
+	}
+}`, `{
+	"anyOf": [
+		{
+			"type": "object",
+			"additionalProperties": false,
+			"required": ["prop1"],
+			"properties": {
+				"prop1": {
+					"type": "string"
+				}
+			}
+		},
+		{
+			"type": "object",
+			"additionalProperties": false,
+			"properties": {
+				"prop2": {
+					"type": "string"
+				}
+			}
+		}
+	]
+}`, `{
+		"oneOf": [
+			{
+				"type": "object",
+				"additionalProperties": false,
+				"required": ["prop1"],
+				"properties": {
+					"prop1": {
+						"type": "string"
+					}
+				}
+			},
+			{
+				"type": "object",
+				"additionalProperties": false,
+				"properties": {
+					"prop2": {
+						"type": "string"
+					}
+				}
+			}
+		]
+}`, `{
+		"allOf": [
+			{
+				"type": "object",
+				"additionalProperties": false,
+				"required": ["prop1"],
+				"properties": {
+					"prop1": {
+						"type": "string"
+					}
+				}
+			},
+			{
+				"type": "object",
+				"additionalProperties": false,
+				"properties": {
+					"prop2": {
+						"type": "string"
+					}
+				}
+			}
+		]
+	}
+`}
+
+	for _, jsonSchema := range schemas {
+		var dataSchema Schema
+		err := json.Unmarshal([]byte(jsonSchema), &dataSchema)
+		require.NoError(t, err)
+
+		err = dataSchema.VisitJSON(payload)
+		require.Error(t, err)
+	}
+}