[
 {
  "note": "Dragging sketch geometry snaps like Fusion: onto a point (coincident on release), level with a point (a dashed guide, no constraint), not at all with Ctrl held; a line dragged by its body snaps by its ends."
 },
 {
  "start": "sketch.create"
 },
 {
  "click": {
   "plane": "XY"
  }
 },
 {
  "call": "engine.execute",
  "params": {
   "command": "sketch.line",
   "params": {
    "points": [
     [
      10,
      10
     ],
     [
      30,
      10
     ]
    ]
   }
  }
 },
 {
  "call": "engine.execute",
  "params": {
   "command": "sketch.line",
   "params": {
    "points": [
     [
      10,
      30
     ],
     [
      30,
      40
     ]
    ]
   }
  }
 },
 {
  "expect": {
   "dof": 8
  }
 },
 {
  "note": "An end dropped near another end snaps onto it and becomes coincident."
 },
 {
  "drag": [
   {
    "sketch": [
     10,
     30
    ]
   },
   {
    "sketch": [
     30.4,
     10.3
    ]
   }
  ],
  "steps": 12
 },
 {
  "expect": {
   "dof": 6,
   "query": {
    "command": "sketch.inspect",
    "path": [
     "curves",
     1,
     "start_at"
    ],
    "value": [
     30.0,
     10.0
    ]
   }
  }
 },
 {
  "expect": {
   "query": {
    "command": "sketch.inspect",
    "path": [
     "constraints",
     0,
     "type"
    ],
    "value": "coincident"
   }
  }
 },
 {
  "note": "Level with l1's start: y snaps to 10 exactly, nothing is added."
 },
 {
  "drag": [
   {
    "sketch": [
     30,
     40
    ]
   },
   {
    "sketch": [
     55,
     10.4
    ]
   }
  ],
  "steps": 12
 },
 {
  "expect": {
   "dof": 6,
   "query": {
    "command": "sketch.inspect",
    "path": [
     "curves",
     1,
     "end_at",
     1
    ],
    "value": 10.0
   }
  }
 },
 {
  "expect": {
   "query": {
    "command": "sketch.inspect",
    "path": [
     "constraints",
     1
    ],
    "value": null
   }
  }
 },
 {
  "note": "Ctrl held: no snap (the end stays where it is let go)."
 },
 {
  "drag": [
   {
    "sketch": [
     55,
     10
    ]
   },
   {
    "sketch": [
     10.3,
     10.3
    ]
   }
  ],
  "steps": 12,
  "ctrl": true
 },
 {
  "expect": {
   "dof": 6,
   "query": {
    "command": "sketch.inspect",
    "path": [
     "constraints",
     1
    ],
    "value": null
   }
  }
 },
 {
  "key": "Z",
  "cmd": true
 },
 {
  "expect": {
   "query": {
    "command": "sketch.inspect",
    "path": [
     "curves",
     1,
     "end_at",
     1
    ],
    "value": 10.0
   }
  }
 },
 {
  "note": "Undo takes the snap's constraint with the drag that made it."
 },
 {
  "key": "Z",
  "cmd": true
 },
 {
  "key": "Z",
  "cmd": true
 },
 {
  "expect": {
   "dof": 8,
   "query": {
    "command": "sketch.inspect",
    "path": [
     "constraints",
     0
    ],
    "value": null
   }
  }
 },
 {
  "note": "A line dragged by its body: its start, brought near l1's start, snaps onto it (coincident)."
 },
 {
  "call": "engine.execute",
  "params": {
   "command": "sketch.line",
   "params": {
    "points": [
     [
      40,
      30
     ],
     [
      50,
      30
     ]
    ]
   }
  }
 },
 {
  "drag": [
   {
    "sketch": [
     45,
     30
    ]
   },
   {
    "sketch": [
     15.3,
     10.3
    ]
   }
  ],
  "steps": 16
 },
 {
  "expect": {
   "dof": 10,
   "query": {
    "command": "sketch.inspect",
    "path": [
     "curves",
     2,
     "start_at"
    ],
    "value": [
     10.0,
     10.0
    ]
   }
  }
 }
]