Added test for STL output quality control

Author: jmwright

tests/test_stl_codec.py

@@ -1,3 +1,4 @@
+import os
 import tests.test_helpers as helpers
 
 def test_stl_codec():
@@ -9,4 +10,25 @@ def test_stl_codec():
     command = ["python", "cq-cli.py", "--codec", "stl", "--infile", test_file]
     out, err, exitcode = helpers.cli_call(command)
 
-    assert out.decode().split('\n')[0].replace('\r', '') == "solid "
+    assert out.decode().split('\n')[0].replace('\r', '') == "solid "
+
+def test_stl_codec_quality():
+    """
+    Test of the STL codec plugin's ability to adjust the quality of the resulting STL.
+    """
+    test_file = helpers.get_test_file_location("sphere.py")
+
+    command = ["python", "cq-cli.py", "--codec", "stl", "--infile", test_file, "--outfile", "/tmp/high.stl"]
+    out, err, exitcode = helpers.cli_call(command)
+
+    # Keep track of the number of lines for each STL as an approximate measure of quality
+    high_detail = os.path.getsize("/tmp/high.stl")
+
+    # Attempt to adjust the quality of the resulting STL
+    command2 = ["python", "cq-cli.py", "--codec", "stl", "--infile", test_file, "--outfile", "/tmp/low.stl", "--outputopts", "linearDeflection:0.3;angularDeflection:0.3"]
+    out2, err2, exitcode2 = helpers.cli_call(command2)
+
+    # Keep track of the number of lines in the STL as an approximate measure of quality
+    low_detail = os.path.getsize("/tmp/low.stl")
+
+    assert low_detail < high_detail

tests/testdata/sphere.py

@@ -0,0 +1,5 @@
+import cadquery as cq
+
+sphere = cq.Workplane().sphere(1)
+
+show_object(sphere)