Migrate Figure.grdcontour tests to dvc (#1158)

Co-authored-by: Dongdong Tian <[email protected]>

pygmt/tests/baseline/test_grdcontour.png.dvc

@@ -0,0 +1,4 @@
+outs:
+- md5: 438f13a0356e3bec8e3762180ea9c2f0
+  size: 219869
+  path: test_grdcontour.png

pygmt/tests/baseline/test_grdcontour_file.png.dvc

@@ -0,0 +1,4 @@
+outs:
+- md5: fa2f0be00003b6a1cf8cc80da0eb824c
+  size: 102192
+  path: test_grdcontour_file.png

pygmt/tests/baseline/test_grdcontour_interval_file_full_opts.png.dvc

@@ -0,0 +1,4 @@
+outs:
+- md5: 7f655c17e068dd4860c5f97b7503a314
+  size: 38237
+  path: test_grdcontour_interval_file_full_opts.png

pygmt/tests/baseline/test_grdcontour_labels.png.dvc

@@ -0,0 +1,4 @@
+outs:
+- md5: 582303f039a43f271c543b78d3a3ff4b
+  size: 226135
+  path: test_grdcontour_labels.png

pygmt/tests/baseline/test_grdcontour_slice.png.dvc

@@ -0,0 +1,4 @@
+outs:
+- md5: c9538960aae7cd5263bce0f6bda20090
+  size: 102143
+  path: test_grdcontour_slice.png

pygmt/tests/test_grdcontour.py

@@ -8,7 +8,6 @@
 from pygmt import Figure
 from pygmt.datasets import load_earth_relief
 from pygmt.exceptions import GMTInvalidInput
-from pygmt.helpers.testing import check_figures_equal
 
 TEST_DATA_DIR = os.path.join(os.path.dirname(__file__), "data")
 TEST_CONTOUR_FILE = os.path.join(TEST_DATA_DIR, "contours.txt")
@@ -22,52 +21,45 @@ def fixture_grid():
     return load_earth_relief(registration="gridline")
 
 
-@check_figures_equal()
+@pytest.mark.mpl_image_compare
 def test_grdcontour(grid):
     """
     Plot a contour image using an xarray grid with fixed contour interval.
     """
-    fig_ref, fig_test = Figure(), Figure()
-    kwargs = dict(interval="1000", projection="W0/6i")
-    fig_ref.grdcontour("@earth_relief_01d_g", **kwargs)
-    fig_test.grdcontour(grid, **kwargs)
-    return fig_ref, fig_test
+    fig = Figure()
+    fig.grdcontour(grid, interval="1000", projection="W0/15c", frame=True)
+    return fig
 
 
-@check_figures_equal()
+@pytest.mark.mpl_image_compare
 def test_grdcontour_labels(grid):
     """
     Plot a contour image using a xarray grid with contour labels and alternate
     colors.
     """
-    fig_ref, fig_test = Figure(), Figure()
-    kwargs = dict(
+    fig = Figure()
+    fig.grdcontour(
+        grid,
         interval="1000",
         annotation="5000",
-        projection="W0/6i",
+        projection="W0/15c",
         pen=["a1p,red", "c0.5p,black"],
-        label_placement="d3i",
+        label_placement="d6c",
+        frame=True,
     )
-    fig_ref.grdcontour("@earth_relief_01d_g", **kwargs)
-    fig_test.grdcontour(grid, **kwargs)
-    return fig_ref, fig_test
+    return fig
 
 
-@check_figures_equal()
+@pytest.mark.mpl_image_compare
 def test_grdcontour_slice(grid):
     """
     Plot an contour image using an xarray grid that has been sliced.
     """
-
-    fig_ref, fig_test = Figure(), Figure()
-
     grid_ = grid.sel(lat=slice(-30, 30))
-    kwargs = dict(interval="1000", projection="M6i")
-    fig_ref.grdcontour(
-        grid="@earth_relief_01d_g", region=[-180, 180, -30, 30], **kwargs
-    )
-    fig_test.grdcontour(grid=grid_, **kwargs)
-    return fig_ref, fig_test
+
+    fig = Figure()
+    fig.grdcontour(grid=grid_, interval="1000", projection="M15c", frame=True)
+    return fig
 
 
 @pytest.mark.mpl_image_compare
@@ -82,43 +74,31 @@ def test_grdcontour_file():
         limit="0",
         pen="0.5p,black",
         region=[-180, 180, -70, 70],
-        projection="M10i",
+        projection="M15c",
+        frame=True,
     )
     return fig
 
 
-@check_figures_equal()
-def test_grdcontour_interval_file_full_opts():
+@pytest.mark.mpl_image_compare
+def test_grdcontour_interval_file_full_opts(grid):
     """
     Plot based on external contour level file.
     """
-    fig_ref, fig_test = Figure(), Figure()
-    # Use single-character arguments for the reference image
-    comargs_ref = {
-        "grid": "@earth_relief_10m",
-        "R": "-161.5/-154/18.5/23",
-        "C": TEST_CONTOUR_FILE,
-        "S": 100,
-        "J": "M6i",
-        "Q": 10,
-    }
-    fig_ref.grdcontour(**comargs_ref, L="-25000/-1", W=["a1p,blue", "c0.5p,blue"])
-    fig_ref.grdcontour(**comargs_ref, L="0", W=["a1p,black", "c0.5p,black"])
+    fig = Figure()
 
-    comargs_test = {
+    comargs = {
         "region": [-161.5, -154, 18.5, 23],
         "interval": TEST_CONTOUR_FILE,
-        "grid": "@earth_relief_10m",
+        "grid": grid,
         "resample": "100",
-        "projection": "M6i",
+        "projection": "M10c",
         "cut": 10,
     }
-    fig_test.grdcontour(
-        **comargs_test, limit=(-25000, -1), pen=["a1p,blue", "c0.5p,blue"]
-    )
-    fig_test.grdcontour(**comargs_test, limit=0, pen=["a1p,black", "c0.5p,black"])
+    fig.grdcontour(**comargs, limit=(-25000, -1), pen=["a1p,blue", "c0.5p,blue"])
+    fig.grdcontour(**comargs, limit=0, pen=["a1p,black", "c0.5p,black"], frame=True)
 
-    return fig_ref, fig_test
+    return fig
 
 
 def test_grdcontour_fails():