Add tests with `test_write_eddy`

Inst_eddies/Tests/test_output.json

+[
+    {
+	"title": "Medium_mix",
+	"description": "Append to medium-sized SHPC, mixing output to the three shapefiles.",
+	"input": "&main_nml /\n",
+	"command" :
+	[
+	    "time",
+	    "$build_dir/Inst_eddies/Tests/test_write_eddy"
+	],
+	"copy":	["$PWD/n_dates_14/SHPC_cyclo"],
+	"stdout": "test_write_eddy_stdout.txt"
+    },
+    {
+	"title": "Small_mix",
+	"description": "Append to small SHPC, mixing output to the three shapefiles.",
+	"input": "&main_nml /\n",
+	"command" :
+	[
+	    "time",
+	    "$build_dir/Inst_eddies/Tests/test_write_eddy"
+	],
+	"copy":	["$PWD/n_dates_1/SHPC_cyclo"],
+	"stdout": "test_write_eddy_stdout.txt"
+    },
+    {
+	"title": "Medium_sep",
+	"description": "Append to medium-sized SHPC, separating output to the three shapefiles.",
+	"input": "&main_nml mixed = f/\n",
+	"command" :
+	[
+	    "time",
+	    "$build_dir/Inst_eddies/Tests/test_write_eddy"
+	],
+	"copy":	["$PWD/n_dates_14/SHPC_cyclo"],
+	"stdout": "test_write_eddy_stdout.txt"
+    },
+    {
+	"title": "Small_sep",
+	"description": "Append to small SHPC, separating output to the three shapefiles.",
+	"input": "&main_nml mixed = f/\n",
+	"command" :
+	[
+	    "time",
+	    "$build_dir/Inst_eddies/Tests/test_write_eddy"
+	],
+	"copy":	["$PWD/n_dates_1/SHPC_cyclo"],
+	"stdout": "test_write_eddy_stdout.txt"
+    },
+    {
+	"title": "Create_mix",
+	"description": "Create SHPC, mixing output to the three shapefiles.",
+	"input": "&main_nml /\n",
+	"commands" :
+	[
+	    ["mkdir", "SHPC_cyclo"],
+	    [
+		"time",
+		"$build_dir/Inst_eddies/Tests/test_write_eddy"
+	    ]
+	],
+	"stdout": "test_write_eddy_stdout.txt"
+    },
+    {
+	"title": "Create_sep",
+	"description": "Create SHPC, separating output to the three shapefiles.",
+	"input": "&main_nml mixed = f/\n",
+	"commands" :
+	[
+	    ["mkdir", "SHPC_cyclo"],
+	    [
+		"time",
+		"$build_dir/Inst_eddies/Tests/test_write_eddy"
+	    ]
+	],
+	"stdout": "test_write_eddy_stdout.txt"
+    },
+    {
+	"title": "Big_mix",
+	"description": "Append to big SHPC, mixing output to the three shapefiles.",
+	"input": "&main_nml /\n",
+	"command" :
+	[
+	    "time",
+	    "$build_dir/Inst_eddies/Tests/test_write_eddy"
+	],
+	"copy":	["$PWD/Inst_eddies_9/SHPC_cyclo"],
+	"stdout": "test_write_eddy_stdout.txt"
+    },
+    {
+	"title": "Big_sep",
+	"description": "Append to big SHPC, separating output to the three shapefiles.",
+	"input": "&main_nml mixed = f/\n",
+	"command" :
+	[
+	    "time",
+	    "$build_dir/Inst_eddies/Tests/test_write_eddy"
+	],
+	"copy":	["$PWD/Inst_eddies_9/SHPC_cyclo"],
+	"stdout": "test_write_eddy_stdout.txt"
+    }
+]