Walmart (WMT) received several analyst upgrades a week ahead of its earnings report. Patrick Ciummo with Charles Schwab analyzes a recent gap up on Walmart's price action that has since stalled out in recent days. On a longer-term chart, he highlights a Double Top pattern that appeared earlier in the year, which was followed by some selling pressure. He explains Walmart's upcoming earnings report on November 19th could be a chance to test key resistance levels.