diff --git a/pygmt/tests/baseline/test_meca_loc_array.png b/pygmt/tests/baseline/test_meca_loc_array.png
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new file mode 100644
index 00000000000..31612381e84
--- /dev/null
+++ b/pygmt/tests/baseline/test_meca_loc_array.png.dvc
@@ -0,0 +1,4 @@
+outs:
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+  size: 4903
+  path: test_meca_loc_array.png
diff --git a/pygmt/tests/baseline/test_meca_spec_1d_array.png b/pygmt/tests/baseline/test_meca_spec_1d_array.png
deleted file mode 100644
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new file mode 100644
index 00000000000..def65f4334c
--- /dev/null
+++ b/pygmt/tests/baseline/test_meca_spec_1d_array.png.dvc
@@ -0,0 +1,4 @@
+outs:
+- md5: 05610aeb221699698eac9d74012b5c0b
+  size: 3212
+  path: test_meca_spec_1d_array.png
diff --git a/pygmt/tests/baseline/test_meca_spec_2d_array.png b/pygmt/tests/baseline/test_meca_spec_2d_array.png
deleted file mode 100644
index 51c62146df3..00000000000
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new file mode 100644
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--- /dev/null
+++ b/pygmt/tests/baseline/test_meca_spec_2d_array.png.dvc
@@ -0,0 +1,4 @@
+outs:
+- md5: b3e49cd999ed234d679f359d7b4fac28
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+  path: test_meca_spec_2d_array.png
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deleted file mode 100644
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new file mode 100644
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--- /dev/null
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@@ -0,0 +1,4 @@
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+  path: test_meca_spec_dataframe.png
diff --git a/pygmt/tests/baseline/test_meca_spec_dict_list.png b/pygmt/tests/baseline/test_meca_spec_dict_list.png
deleted file mode 100644
index c4b54723c7b..00000000000
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new file mode 100644
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--- /dev/null
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@@ -0,0 +1,4 @@
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+  path: test_meca_spec_dict_list.png
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deleted file mode 100644
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new file mode 100644
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--- /dev/null
+++ b/pygmt/tests/baseline/test_meca_spec_dictionary.png.dvc
@@ -0,0 +1,4 @@
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+  size: 19564
+  path: test_meca_spec_dictionary.png
diff --git a/pygmt/tests/baseline/test_meca_spec_file.png b/pygmt/tests/baseline/test_meca_spec_file.png
deleted file mode 100644
index d3a57997080..00000000000
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diff --git a/pygmt/tests/baseline/test_meca_spec_file.png.dvc b/pygmt/tests/baseline/test_meca_spec_file.png.dvc
new file mode 100644
index 00000000000..1693cb3f82d
--- /dev/null
+++ b/pygmt/tests/baseline/test_meca_spec_file.png.dvc
@@ -0,0 +1,4 @@
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+- md5: ad602355748d74a76edfa5cef4100b13
+  size: 3179
+  path: test_meca_spec_file.png
diff --git a/pygmt/tests/test_meca.py b/pygmt/tests/test_meca.py
index 24715cd92a2..400ef37570d 100644
--- a/pygmt/tests/test_meca.py
+++ b/pygmt/tests/test_meca.py
@@ -15,12 +15,10 @@
 @pytest.mark.mpl_image_compare
 def test_meca_spec_dictionary():
     """
-    Test supplying a dictionary containing a single focal mechanism to the
-    `spec` argument.
+    Test supplying a dictionary containing a single focal mechanism to the spec
+    parameter.
     """
-
     fig = Figure()
-
     # Right lateral strike slip focal mechanism
     fig.meca(
         dict(strike=0, dip=90, rake=0, magnitude=5),
@@ -32,7 +30,6 @@ def test_meca_spec_dictionary():
         projection="M14c",
         frame=2,
     )
-
     return fig
 
 
@@ -40,16 +37,13 @@ def test_meca_spec_dictionary():
 def test_meca_spec_dict_list():
     """
     Test supplying a dictionary containing a list of focal mechanism to the
-    `spec` argument.
+    spec parameter.
     """
-
     fig = Figure()
-
     # supply focal mechanisms as a dict of lists
     focal_mechanisms = dict(
         strike=[330, 350], dip=[30, 50], rake=[90, 90], magnitude=[3, 2]
     )
-
     fig.meca(
         focal_mechanisms,
         longitude=[-124.3, -124.4],
@@ -59,15 +53,14 @@ def test_meca_spec_dict_list():
         scale="2c",
         projection="M14c",
     )
-
     return fig
 
 
 @pytest.mark.mpl_image_compare
 def test_meca_spec_dataframe():
     """
-    Test supplying a pandas DataFrame containing focal mechanisms and locations
-    to the `spec` argument.
+    Test supplying a pandas.DataFrame containing focal mechanisms and locations
+    to the spec parameter.
     """
 
     fig = Figure()
@@ -83,9 +76,7 @@ def test_meca_spec_dataframe():
         depth=[12, 11.0],
     )
     spec_dataframe = pd.DataFrame(data=focal_mechanisms)
-
     fig.meca(spec_dataframe, region=[-125, -122, 47, 49], scale="2c", projection="M14c")
-
     return fig
 
 
@@ -93,11 +84,9 @@ def test_meca_spec_dataframe():
 def test_meca_spec_1d_array():
     """
     Test supplying a 1D numpy array containing focal mechanisms and locations
-    to the `spec` argument.
+    to the spec parameter.
     """
-
     fig = Figure()
-
     # supply focal mechanisms to meca as a 1D numpy array, here we are using
     # the Harvard CMT zero trace convention but the focal mechanism
     # parameters may be specified any of the available conventions. Since we
@@ -118,7 +107,6 @@ def test_meca_spec_1d_array():
         0,  # plot_lat, 0 to plot at event location
     ]
     focal_mech_array = np.asarray(focal_mechanism)
-
     fig.meca(
         focal_mech_array,
         convention="mt",
@@ -127,7 +115,6 @@ def test_meca_spec_1d_array():
         scale="2c",
         projection="M14c",
     )
-
     return fig
 
 
@@ -135,11 +122,9 @@ def test_meca_spec_1d_array():
 def test_meca_spec_2d_array():
     """
     Test supplying a 2D numpy array containing focal mechanisms and locations
-    to the `spec` argument.
+    to the spec parameter.
     """
-
     fig = Figure()
-
     # supply focal mechanisms to meca as a 2D numpy array, here we are using
     # the GCMT convention but the focal mechanism parameters may be
     # specified any of the available conventions. Since we are not using a
@@ -163,7 +148,6 @@ def test_meca_spec_2d_array():
         [-127.50, 40.88, 12.0, 168, 40, -115, 20, 54, -70, 4.0, 23, 0, 0],
     ]
     focal_mechs_array = np.asarray(focal_mechanisms)
-
     fig.meca(
         focal_mechs_array,
         convention="gcmt",
@@ -171,21 +155,18 @@ def test_meca_spec_2d_array():
         scale="2c",
         projection="M14c",
     )
-
     return fig
 
 
 @pytest.mark.mpl_image_compare
 def test_meca_spec_file():
     """
-    Test supplying a file containing focal mechanisms and locations to the
-    `spec` argument.
+    Test supplying a file containing focal mechanisms and locations to the spec
+    parameter.
     """
 
     fig = Figure()
-
     focal_mechanism = [-127.43, 40.81, 12, -3.19, 1.16, 3.93, -1.02, -3.93, -1.02, 23]
-
     # writes temp file to pass to gmt
     with GMTTempFile() as temp:
         with open(temp.name, mode="w") as temp_file:
@@ -199,7 +180,6 @@ def test_meca_spec_file():
             scale="2c",
             projection="M14c",
         )
-
     return fig
 
 
@@ -209,22 +189,17 @@ def test_meca_loc_array():
     Test supplying lists and np.ndarrays as the event location (longitude,
     latitude, and depth).
     """
-
     fig = Figure()
-
     # specify focal mechanisms
     focal_mechanisms = dict(
         strike=[327, 350], dip=[41, 50], rake=[68, 90], magnitude=[3, 2]
     )
-
     # longitude, latitude, and depth may be specified as an int, float,
     # list, or 1d numpy array
     longitude = np.array([-123.3, -124.4])
     latitude = np.array([48.4, 48.2])
     depth = [12.0, 11.0]  # to test mixed data types as inputs
-
     scale = "2c"
-
     fig.meca(
         focal_mechanisms,
         scale,
@@ -234,5 +209,4 @@ def test_meca_loc_array():
         region=[-125, -122, 47, 49],
         projection="M14c",
     )
-
     return fig