diff --git a/gpfit/plot_fit.py b/gpfit/plot_fit.py
index 1dba6d7..fe28bc2 100644
--- a/gpfit/plot_fit.py
+++ b/gpfit/plot_fit.py
@@ -7,7 +7,7 @@
 
 # pylint: disable=invalid-name
 # pylint: disable=too-many-locals
-def plot_fit_1d(udata, wdata, K=1, fitclass='MA', plotspace='log'):
+def plot_fit_1d(udata, wdata, K=1, fitclass='SMA', plotspace='log'):
     "Finds and plots a fit (MA or SMA) for 1D data"
 
     cstrt, _ = fit(np.log(udata), np.log(wdata), K, fitclass)
@@ -50,11 +50,10 @@ def plot_fit_1d(udata, wdata, K=1, fitclass='MA', plotspace='log'):
     ax.set_xlabel('u')
     ax.legend(['Data'] + stringlist, loc='best')
 
-    plt.show()
     return f, ax
 
 if __name__ == "__main__":
     N = 51
     U = np.logspace(0, np.log10(3), N)
     W = (U**2+3) / (U+1)**2
-    plot_fit_1d(U, W, K=2, fitclass='MA', plotspace="linear")
+    plot_fit_1d(U, W, K=2, fitclass='SMA', plotspace="linear")
diff --git a/gpfit/tests/run_tests.py b/gpfit/tests/run_tests.py
index e3d7fe7..b9deb24 100644
--- a/gpfit/tests/run_tests.py
+++ b/gpfit/tests/run_tests.py
@@ -26,6 +26,9 @@
 from gpfit.tests import t_print_fit
 TESTS += t_print_fit.TESTS
 
+from gpfit.tests import t_plot_fit
+TESTS += t_plot_fit.TESTS
+
 from gpfit.tests import t_ex6_3
 TESTS += t_ex6_3.TESTS
 
diff --git a/gpfit/tests/t_plot_fit.py b/gpfit/tests/t_plot_fit.py
new file mode 100644
index 0000000..12e6e38
--- /dev/null
+++ b/gpfit/tests/t_plot_fit.py
@@ -0,0 +1,26 @@
+"unit tests for gpfit.print_fit module"
+import unittest
+import numpy as np
+from gpfit.plot_fit import plot_fit_1d
+
+
+class TestPlotFit(unittest.TestCase):
+    "Unit tests for plot_fit_1d"
+
+    def test_plot_fit_1d(self):
+        N = 51
+        U = np.logspace(0, np.log10(3), N)
+        W = (U**2+3) / (U+1)**2
+        plot_fit_1d(U, W, K=2, fitclass='SMA', plotspace="linear")
+
+
+TESTS = [TestPlotFit]
+
+if __name__ == '__main__':
+    SUITE = unittest.TestSuite()
+    LOADER = unittest.TestLoader()
+
+    for t in TESTS:
+        SUITE.addTests(LOADER.loadTestsFromTestCase(t))
+
+    unittest.TextTestRunner(verbosity=2).run(SUITE)