A working test of the program in project-serum/anchor/tests/tictactoe, mostly the .js test shown there in /tests dir, but fixed to work (1 constraint removed) w/2 new tests added at bottom.

solana_anchor_tests_tic_tac_toe_program.js

const anchor = require('@project-serum/anchor');

describe('tiktaktoe', () => {

  anchor.setProvider(anchor.Provider.env());
  const program = anchor.workspace.Tictactoe;
  let dashboard = anchor.web3.Keypair.generate()
  let game = anchor.web3.Keypair.generate()
  let player_o = anchor.web3.Keypair.generate()

  it('Initialize Dashboard', async () => {
    const tx = await program.rpc.initializeDashboard({
      accounts: {
        authority: program.provider.wallet.publicKey,
        dashboard: dashboard.publicKey,
        rent: anchor.web3.SYSVAR_RENT_PUBKEY,
      },
      signers: [dashboard],
      instructions: [await program.account.dashboard.createInstruction(dashboard)]
    })

    console.log("transaction: ", tx)
    //console.log("t-count: ", tx.gameCount)
  });

  it('Initialize Game', async () => {
    const tx = await program.rpc.initialize({
      accounts: {
        playerX: program.provider.wallet.publicKey,
        dashboard: dashboard.publicKey,
        game: game.publicKey,
        rent: anchor.web3.SYSVAR_RENT_PUBKEY,
      },
      signers: [game],
      instructions: [await program.account.game.createInstruction(game)]
    })

    console.log("transaction: ", tx)
  });

  it('Player O joins', async () => {
    const tx = await program.rpc.playerJoin({
      accounts: {
        playerO: player_o.publicKey,
        game: game.publicKey,
      },
      signers: [player_o],
    })

    console.log("transaction: ", tx)
  });

  it('Player x plays', async () => {
    const tx = await program.rpc.playerMove(1, 0, {
      accounts: {
        player: program.provider.wallet.publicKey,
        game: game.publicKey,
      },
    })
    console.log("transaction: ", tx)
  });

  it('Player o plays', async () => {
    const tx = await program.rpc.playerMove(2, 1, {
      accounts: {
        player: player_o.publicKey,
        game: game.publicKey,
      },
      signers: [player_o]
    })
    console.log("transaction: ", tx)
  });

  it('Player x plays', async () => {
    const tx = await program.rpc.playerMove(1, 3, {
      accounts: {
        player: program.provider.wallet.publicKey,
        game: game.publicKey,
      },
    })
    console.log("transaction: ", tx)
  });

  it('Player o plays', async () => {
    const tx = await program.rpc.playerMove(2, 6, {
      accounts: {
        player: player_o.publicKey,
        game: game.publicKey,
      },
      signers: [player_o]
    })
    console.log("transaction: ", tx)
  });

  it('Player x plays', async () => {
    const tx = await program.rpc.playerMove(1, 2, {
      accounts: {
        player: program.provider.wallet.publicKey,
        game: game.publicKey,
      },
    })
    console.log("transaction: ", tx)
  });

  it('Player o plays', async () => {
    const tx = await program.rpc.playerMove(2, 4, {
      accounts: {
        player: player_o.publicKey,
        game: game.publicKey,
      },
      signers: [player_o]
    })
    console.log("transaction: ", tx)
  });

  it('Player x plays', async () => {
    const tx = await program.rpc.playerMove(1, 5, {
      accounts: {
        player: program.provider.wallet.publicKey,
        game: game.publicKey,
      },
    })
    console.log("transaction: ", tx)
  });

  it('Player o plays', async () => {
    const tx = await program.rpc.playerMove(2, 8, {
      accounts: {
        player: player_o.publicKey,
        game: game.publicKey,
      },
      signers: [player_o]
    })
    console.log("transaction: ", tx)
  });

  it('Player x plays', async () => {
    const tx = await program.rpc.playerMove(1, 7, {
      accounts: {
        player: program.provider.wallet.publicKey,
        game: game.publicKey,
      },
    })
    console.log("transaction: ", tx)
  });

  it('Dashboard fetch', async () => {
    const atx = await program.account.dashboard.fetch(dashboard.publicKey);
    console.log("dash-game-count: ", atx.gameCount)
    console.log("dash-address: ", atx.address)
  });

  it('Game fetch', async () => {
    const atx = await program.account.game.fetch(game.publicKey);
    console.log("game-state: ", atx.gameState)
    console.log("game-board: ", atx.board)
  });

  it('Status', async () => {
    const tx = await program.rpc.status({
      accounts: {
        dashboard: dashboard.publicKey,
        game: game.publicKey,
      },
    })
    console.log("transaction: ", tx)
  });

});