Function TestGetFunctionAtPosition

pkg/lsp/handler_test.go:576–644

TestGetFunctionAtPosition tests the internal function position detection

(t *testing.T)

// TestGetFunctionAtPosition tests the internal function position detection
func TestGetFunctionAtPosition(t *testing.T) {
	mock := newMockReadWriter()
	logger := log.New(io.Discard, "", 0)
	server := NewServer(mock.input, mock.output, logger)
	handler := server.handler

	tests := []struct {
		name          string
		content       string
		position      Position
		expectedFunc  string
		expectedParam int
	}{
		{
			name:          "Simple function call",
			content:       "SELECT COUNT(*) FROM users",
			position:      Position{Line: 0, Character: 13},
			expectedFunc:  "COUNT",
			expectedParam: 0,
		},
		{
			name:          "Function with multiple params - first param",
			content:       "SELECT COALESCE(name, email, phone) FROM users",
			position:      Position{Line: 0, Character: 20},
			expectedFunc:  "COALESCE",
			expectedParam: 0,
		},
		{
			name:          "Function with multiple params - second param",
			content:       "SELECT COALESCE(name, email, phone) FROM users",
			position:      Position{Line: 0, Character: 27},
			expectedFunc:  "COALESCE",
			expectedParam: 1,
		},
		{
			name:          "Function with multiple params - third param",
			content:       "SELECT COALESCE(name, email, phone) FROM users",
			position:      Position{Line: 0, Character: 34},
			expectedFunc:  "COALESCE",
			expectedParam: 2,
		},
		{
			name:          "Nested function - outer",
			content:       "SELECT UPPER(TRIM(name)) FROM users",
			position:      Position{Line: 0, Character: 23},
			expectedFunc:  "UPPER",
			expectedParam: 0,
		},
		{
			name:          "Position outside function",
			content:       "SELECT * FROM users",
			position:      Position{Line: 0, Character: 8},
			expectedFunc:  "",
			expectedParam: 0,
		},
	}

	for _, tt := range tests {