Improve error handling across the board

processor/jsonpath/jsonpath_test.go

@@ -93,6 +93,7 @@ func TestEvaluator(t *testing.T) {
 		name     string
 		path     string
 		expected []JSONNode
+		error    bool
 	}{
 		{
 			name: "simple_property_access",
@@ -146,18 +147,26 @@ func TestEvaluator(t *testing.T) {
 			name:     "invalid_index",
 			path:     "$.store.book[5]",
 			expected: []JSONNode{},
+			error:    true,
 		},
 		{
 			name:     "nonexistent_property",
 			path:     "$.store.nonexistent",
 			expected: []JSONNode{},
+			error:    true,
 		},
 	}
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			// Use GetWithPaths directly
-			result := Get(testData, tt.path)
+			result, err := Get(testData, tt.path)
+			if err != nil {
+				if !tt.error {
+					t.Errorf("Get() returned error: %v", err)
+				}
+				return
+			}
 
 			// Special handling for wildcard recursive test
 			if tt.name == "wildcard_recursive" {
@@ -201,7 +210,11 @@ func TestEvaluator(t *testing.T) {
 
 func TestEdgeCases(t *testing.T) {
 	t.Run("empty_data", func(t *testing.T) {
-		result := Get(nil, "$.a.b")
+		result, err := Get(nil, "$.a.b")
+		if err == nil {
+			t.Errorf("Expected error for empty data")
+			return
+		}
 		if len(result) > 0 {
 			t.Errorf("Expected empty result, got %v", result)
 		}
@@ -218,7 +231,11 @@ func TestEdgeCases(t *testing.T) {
 		data := map[string]interface{}{
 			"42": "answer",
 		}
-		result := Get(data, "$.42")
+		result, err := Get(data, "$.42")
+		if err != nil {
+			t.Errorf("Get() returned error: %v", err)
+			return
+		}
 		if len(result) == 0 || result[0].Value != "answer" {
 			t.Errorf("Expected 'answer', got %v", result)
 		}
@@ -266,7 +283,11 @@ func TestGetWithPaths(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			result := Get(testData, tt.path)
+			result, err := Get(testData, tt.path)
+			if err != nil {
+				t.Errorf("Get() returned error: %v", err)
+				return
+			}
 
 			// Check if lengths match
 			if len(result) != len(tt.expected) {