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Let's Play: Test-Driven Development is a live, stream-of-consciousness recording of my successes and slip-ups as I work on a real software project. Each episode is about 15 minutes long.

If you're just getting started, you can start from the beginning with the very first episode, view our 100th episode recap, or check out our more recent anniversary episode. Enjoy!


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Let's Play TDD #161: The UserEnteredDollars Value Object () - 02 Feb, 2012


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Let's Play TDD #160: End of Week 1 () - 31 Jan, 2012


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Let's Play TDD #159: How Do We Store Data? () - 17 Jan, 2012


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Let's Play TDD #158: writeFile() and readFile() () - 12 Jan, 2012


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Let's Play TDD #157: Datum () - 10 Jan, 2012


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Let's Play TDD #156: Persistence, for Realsies () - 03 Jan, 2012


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Let's Play TDD #155: Transitioning to SaveFile () - 29 Dec, 2011


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Let's Play TDD #154: Save and Cancel... Done! () - 27 Dec, 2011


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Let's Play TDD #153: Push the Button () - 22 Dec, 2011


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Let's Play TDD #152: No-ckito () - 20 Dec, 2011


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Let's Play TDD #151: Mockito () - 15 Dec, 2011


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Let's Play TDD #150: Mulling Over the Persistence Design () - 13 Dec, 2011


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Let's Play TDD #149: Polishing Off the Save As Dialog () - 08 Dec, 2011


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Let's Play TDD #148: Asynchronous Assertions () - 07 Dec, 2011


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Let's Play TDD #147: Finding the Dialog () - 01 Dec, 2011


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Let's Play TDD #146: Race Condition () - 29 Nov, 2011


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Let's Play TDD #145: Displaying the FileDialog () - 24 Nov, 2011


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Let's Play TDD #144: Cost vs. Benefit () - 29 Sep, 2011


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Let's Play TDD #143: File → Save As... () - 27 Sep, 2011


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Let's Play TDD #142: Good Enough () - 22 Sep, 2011


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Let's Play TDD #141: Domain-Specific Language () - 20 Sep, 2011


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Let's Play TDD #140: Cleaning Up the Menu Code () - 15 Sep, 2011


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Let's Play TDD #139: File → Close () - 13 Sep, 2011


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Let's Play TDD #138: New Windows () - 08 Sep, 2011


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Let's Play TDD #137: How Many Frames? () - 06 Sep, 2011


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Let's Play TDD #136: Accelerators () - 02 Sep, 2011


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Let's Play TDD #135: File → New () - 01 Sep, 2011


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Let's Play TDD #134: Persistence! () - 31 Aug, 2011


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Let's Play TDD #133: Towards an Agile Architecture () - 30 Aug, 2011


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Let's Play TDD #132: Fresh Eyes on the Domain () - 29 Aug, 2011


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Let's Play TDD #131: JComponent vs. JPanel () - 25 Aug, 2011


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Let's Play TDD #130: The Great Negative Color Debacle () - 24 Aug, 2011


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Let's Play TDD #129: Root Cause Analysis () - 18 Aug, 2011


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Let's Play TDD #128: 2^7 () - 02 Aug, 2011


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Let's Play TDD #127: Yearly Spending Field () - 28 Jul, 2011


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Let's Play TDD #126: Following Patterns () - 26 Jul, 2011


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Let's Play TDD #125: The Cost Basis Field () - 21 Jul, 2011


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Let's Play TDD #124: Constraints () - 19 Jul, 2011


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Let's Play TDD #123: MiGLayout () - 14 Jul, 2011


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Let's Play TDD #122: Extracting ConfigurationPanel () - 12 Jul, 2011


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Let's Play TDD #121: Back to the UI Vision () - 07 Jul, 2011


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Let's Play TDD #120: DollarsTextField: Done! () - 05 Jul, 2011


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Let's Play TDD #119: Comments Lie () - 30 Jun, 2011


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Let's Play TDD #118: Coupling vs. Complexity () - 28 Jun, 2011


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Let's Play TDD #117: setIcon() () - 23 Jun, 2011


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Let's Play TDD #116: You Gotta Know What You're Doing () - 21 Jun, 2011


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Let's Play TDD #115: Wrapping Up the Icon Spike () - 16 Jun, 2011


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Let's Play TDD #114: Icon Challenges () - 14 Jun, 2011


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Let's Play TDD #113: OverlayLayout? () - 09 Jun, 2011


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Let's Play TDD #112: It's in the (Grid)Bag () - 07 Jun, 2011


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Let's Play TDD #111: Icon in JTextField: Go! () - 02 Jun, 2011


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Let's Play TDD #110: Create a Beautiful, Simple Result () - 31 May, 2011


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Let's Play TDD #109: Zombie TDGotchi () - 26 May, 2011


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Let's Play TDD #108: Wishing for First-Class Functions () - 25 May, 2011


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Let's Play TDD #107: The Hidden Listener () - 19 May, 2011


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Let's Play TDD #106: Back from the Dead () - 17 May, 2011


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Let's Play TDD #105: Negative TextField () - 21 Apr, 2011


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Let's Play TDD #104: Cleaned Up and Ready to Move On () - 19 Apr, 2011


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Let's Play TDD #103: Test Double () - 14 Apr, 2011


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Let's Play TDD #102: Heresy, Revisited () - 12 Apr, 2011


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Let's Play TDD #101: Factory Method () - 07 Apr, 2011


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Let's Play TDD #100: Twenty-Five Hours () - 05 Apr, 2011


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Let's Play TDD #99: Valid Range () - 31 Mar, 2011


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Let's Play TDD #98: One Beeellion Dollars () - 29 Mar, 2011


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Let's Play TDD #97: Where the Rubber Meets the Road () - 24 Mar, 2011


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Let's Play TDD #96: Resources () - 22 Mar, 2011


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Let's Play TDD #95: Tested, Rendered, and Isolated () - 17 Mar, 2011


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Let's Play TDD #94: SelfRenderable () - 15 Mar, 2011


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Let's Play TDD #93: Insanity Check () - 10 Mar, 2011


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Let's Play TDD #92: InvalidDollars Gets an Icon () - 08 Mar, 2011


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Let's Play TDD #91: Rendering ValidDollars () - 03 Mar, 2011


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Let's Play TDD #90: Heresy in the Land of Package Dependencies () - 01 Mar, 2011


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Let's Play TDD #89: The Double of Death () - 24 Feb, 2011


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Let's Play TDD #88: Cascading Failures () - 22 Feb, 2011


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Let's Play TDD #87: InvalidDollars () - 17 Feb, 2011


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Let's Play TDD #86: Pushing Down Methods () - 15 Feb, 2011


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Let's Play TDD #85: ValidDollars () - 10 Feb, 2011


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Let's Play TDD #84: Parentheses () - 08 Feb, 2011


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Let's Play TDD #83: Parsing and Formatting () - 03 Feb, 2011


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Let's Play TDD #82: Constructors, Folklore, and the Java Language Spec () - 01 Feb, 2011


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Let's Play TDD #81: Clunk... Clunk... Clunk... () - 27 Jan, 2011


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Let's Play TDD #80: Focus Lost () - 25 Jan, 2011


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Let's Play TDD #79: Focus Gained () - 20 Jan, 2011


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Let's Play TDD #78: Making Numbers Work () - 18 Jan, 2011


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Let's Play TDD #77: Buy Versus Build () - 15 Jan, 2011


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Let's Play TDD #76: Onward... Slowly () - 11 Jan, 2011


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Let's Play TDD #75: Hacking on the Custom TextField () - 31 Dec, 2010


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Let's Play TDD #74: Number Formatting Spike () - 30 Dec, 2010


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Let's Play TDD #73: Cycles () - 29 Dec, 2010


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Let's Play TDD #72: Starting to Look Like a Real Application () - 28 Dec, 2010


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Let's Play TDD #71: Poking at Listeners () - 27 Dec, 2010


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Let's Play TDD #70: Reflections on Incremental Design () - 17 Dec, 2010


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Let's Play TDD #69: Train Wreck () - 16 Dec, 2010


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Let's Play TDD #68: It's Sh*t Like This, Java () - 15 Dec, 2010


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Let's Play TDD #67: A Closure Would Be Helpful Right About Now () - 14 Dec, 2010


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Let's Play TDD #66: Proving the ApplicationModel Design Concept () - 13 Dec, 2010


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Let's Play TDD #65: Cogitating on ApplicationModel () - 10 Dec, 2010


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Let's Play TDD #64: Integrating ApplicationModel () - 09 Dec, 2010


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Let's Play TDD #63: Simplifying StockMarketProjection () - 08 Dec, 2010


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Let's Play TDD #62: Listening Carefully () - 07 Dec, 2010


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Let's Play TDD #61: Questions of Design () - 06 Dec, 2010


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RECAP: Let's Play TDD, Episodes 51-60 () - 05 Dec, 2010


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Let's Play TDD #60: Layout Managers () - 03 Dec, 2010


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Let's Play TDD #59: Application... Tested! () - 02 Dec, 2010


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Let's Play TDD #58: Violating Encapsulation () - 01 Dec, 2010


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Let's Play TDD #57: Taking Over the Application Frame () - 30 Nov, 2010


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Let's Play TDD #56: Window Titles () - 29 Nov, 2010


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Let's Play TDD #55: The Color of Failure (with Kim Gräsman) () - 24 Nov, 2010


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Let's Play TDD #54: Prognosticating (with Kim Gräsman) () - 23 Nov, 2010


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Let's Play TDD #53: Testing Styles (with Kim Gräsman) () - 22 Nov, 2010


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Let's Play TDD #52: Success! (with Roy Osherove) () - 19 Nov, 2010


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Let's Play TDD #51: Alternate Background Color (with Roy Osherove) () - 18 Nov, 2010


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RECAP: Let's Play TDD, Episodes 41-50 () - 18 Nov, 2010


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Let's Play TDD #50: Code Monkey (with Roy Osherove) () - 17 Nov, 2010


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Let's Play TDD #49: The AlternatingRowTable (with Roy Osherove) () - 16 Nov, 2010


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Let's Play TDD #48: Transitioning to Production Code (with Roy Osherove) () - 15 Nov, 2010


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Let's Play TDD #47: Spike-a-riffic () - 05 Nov, 2010


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Let's Play TDD #46: Don't Mean a Thing If It Ain't Got That Swing () - 04 Nov, 2010


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Let's Play TDD #45: Looking for Keys in All the Wrong Places () - 03 Nov, 2010


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Let's Play TDD #44: Dis Approvals () - 02 Nov, 2010


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Let's Play TDD #43: Seeking Approvals () - 01 Nov, 2010


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Let's Play TDD #42: But What's the Question? () - 23 Oct, 2010


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Let's Play TDD #41: Sell Every Year () - 22 Oct, 2010


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RECAP: Let's Play TDD, Episodes 31-40 () - 21 Oct, 2010


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Let's Play TDD #40: Fixed the Capital Gains Abstraction... I Think () - 20 Oct, 2010


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Let's Play TDD #39: Torturing Myself () - 19 Oct, 2010


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Let's Play TDD #38: Torturing Rob (with Rob Myers) () - 18 Oct, 2010


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Let's Play TDD #37: Reviewing the Code (with Rob Myers) () - 15 Oct, 2010


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Let's Play TDD #36: Pair Programming! (with Rob Myers) () - 14 Oct, 2010


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Let's Play TDD #35: Right on Form () - 13 Oct, 2010


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Let's Play TDD #34: Revising the Capital Gains Tax Abstraction () - 12 Oct, 2010


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Let's Play TDD #33: Value Objects Pay Off () - 11 Oct, 2010


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Let's Play TDD #32: Rounding Off Pennies () - 08 Oct, 2010


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Let's Play TDD #31: Eliminating Dollars.toInt() () - 07 Oct, 2010


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RECAP: Let's Play TDD, Episodes 21-30 () - 06 Oct, 2010


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Let's Play TDD #30: Introducing Dollars.percentage() () - 05 Oct, 2010


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Let's Play TDD #29: More Failing () - 04 Oct, 2010


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Let's Play TDD #28: Integrating Year and Failing Fast () - 01 Oct, 2010


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Let's Play TDD #27: Yet Another Value Object () - 30 Sep, 2010


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Let's Play TDD #26: Integrating StockMarket into StockMarketTableModel () - 29 Sep, 2010


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Let's Play TDD #25: Extracting the StockMarket Class () - 28 Sep, 2010


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Let's Play TDD #24: Finishing Up StockMarketTableModel () - 27 Sep, 2010


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Let's Play TDD #23: Multiple Years () - 24 Sep, 2010


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Let's Play TDD #22: Hooking Up the Domain Model () - 23 Sep, 2010


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Let's Play TDD #21: Column Headers () - 22 Sep, 2010


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RECAP: Let's Play TDD, Episodes 11-20 () - 22 Sep, 2010


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RECAP: Let's Play TDD, Episodes 1-10 () - 21 Sep, 2010


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Let's Play TDD #20: Getting Started on the UI () - 21 Sep, 2010


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Let's Play TDD #19: UI Training () - 20 Sep, 2010


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Let's Play TDD #18: StockMarketYear--Done! (For Now) () - 17 Sep, 2010


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Let's Play TDD #17: Integrating Dollars () - 16 Sep, 2010


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Let's Play TDD #16: The Dollars Class () - 15 Sep, 2010


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Let's Play TDD #15: Integrating TaxRate and InterestRate () - 14 Sep, 2010


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Let's Play TDD #14: Obsessing Over Primitives () - 13 Sep, 2010


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Let's Play TDD #13: The TaxRate Class () - 12 Sep, 2010


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Let's Play TDD #12: Polishing to a High Gloss () - 11 Sep, 2010


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Let's Play TDD #11: Consolidating the Tests () - 10 Sep, 2010


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Let's Play TDD #10: Ending Capital Gains () - 09 Sep, 2010


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Let's Play TDD #9: Seeking Beauty () - 08 Sep, 2010


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Let's Play TDD #8: Cleaning Up Taxes () - 07 Sep, 2010


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Let's Play TDD #7: Tax Rage () - 06 Sep, 2010


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Let's Play TDD #6: Capital Gains Tax--Almost () - 05 Sep, 2010


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Let's Play TDD #5: Sneaking Up on the Problem () - 04 Sep, 2010


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Let's Play TDD #4: Gaining on Capital Gains () - 03 Sep, 2010


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Let's Play TDD #3: Cleaning Up My Mess () - 02 Sep, 2010


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Let's Play TDD #2: Peering Dimly Into the Future () - 01 Sep, 2010


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Let's Play: Test-Driven Development () - 31 Aug, 2010


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Let's Play TDD #162: Wishing for Double Dispatch ()