Rename 'maze' -> 'constrictor', remove use of food

constrictor_test.go

@@ -0,0 +1,129 @@
+package rules
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestConstrictorRulesetInterface(t *testing.T) {
+	var _ Ruleset = (*ConstrictorRuleset)(nil)
+}
+
+func TestConstrictorCreateInitialBoardState(t *testing.T) {
+	tests := []struct {
+		Height int32
+		Width  int32
+		IDs    []string
+	}{
+		{1, 1, []string{}},
+		{1, 1, []string{"one"}},
+		{2, 2, []string{"one"}},
+		{2, 2, []string{"one", "two"}},
+		{11, 1, []string{"one", "two"}},
+		{11, 11, []string{}},
+		{11, 11, []string{"one", "two", "three", "four", "five"}},
+	}
+
+	r := ConstrictorRuleset{}
+	for testNum, test := range tests {
+		state, err := r.CreateInitialBoardState(test.Width, test.Height, test.IDs)
+		require.NoError(t, err)
+		require.NotNil(t, state)
+		require.Equal(t, test.Width, state.Width)
+		require.Equal(t, test.Height, state.Height)
+		require.Len(t, state.Food, 0, testNum)
+		// Verify snakes
+		require.Equal(t, len(test.IDs), len(state.Snakes))
+		for i, id := range test.IDs {
+			require.Equal(t, id, state.Snakes[i].ID)
+			require.Equal(t, state.Snakes[i].Body[2], state.Snakes[i].Body[1])
+		}
+	}
+}
+
+func TestConstrictorCreateNextBoardState(t *testing.T) {
+	tests := []struct {
+		prevState     *BoardState
+		moves         []SnakeMove
+		expectedState *BoardState
+	}{
+		{
+			&BoardState{
+				Width:  3,
+				Height: 3,
+				Snakes: []Snake{
+					{
+						ID:     "one",
+						Body:   []Point{{0, 0}, {0, 0}, {0, 0}},
+						Health: 100,
+					},
+					{
+						ID:     "two",
+						Body:   []Point{{2, 2}, {2, 2}, {2, 2}},
+						Health: 100,
+					},
+				},
+				Food: []Point{},
+			},
+			[]SnakeMove{
+				{ID: "one", Move: MoveDown},
+				{ID: "two", Move: MoveUp},
+			},
+			&BoardState{
+				Width:  3,
+				Height: 3,
+				Snakes: []Snake{
+					{
+						ID:     "one",
+						Body:   []Point{{0, 1}, {0, 0}, {0, 0}},
+						Health: 100,
+					},
+					{
+						ID:     "two",
+						Body:   []Point{{2, 1}, {2, 2}, {2, 2}},
+						Health: 100,
+					},
+				},
+				Food: []Point{},
+			},
+		},
+		// Ensure snakes keep growing and are fed
+		{
+			&BoardState{
+				Width:  3,
+				Height: 3,
+				Snakes: []Snake{
+					{
+						ID:     "one",
+						Body:   []Point{{2, 0}, {1, 0}, {0, 0}, {0, 0}},
+						Health: 75,
+					},
+				},
+				Food: []Point{},
+			},
+			[]SnakeMove{
+				{ID: "one", Move: MoveDown},
+			},
+			&BoardState{
+				Width:  3,
+				Height: 3,
+				Snakes: []Snake{
+					{
+						ID:     "one",
+						Body:   []Point{{2, 1}, {2, 0}, {1, 0}, {0, 0}, {0, 0}},
+						Health: 100,
+					},
+				},
+				Food: []Point{},
+			},
+		},
+	}
+
+	r := ConstrictorRuleset{}
+	for _, test := range tests {
+		nextState, err := r.CreateNextBoardState(test.prevState, test.moves)
+		require.NoError(t, err)
+		require.Equal(t, test.expectedState, nextState)
+	}
+}