tests [export]: Properly isolate test cases and remove duplicate code.

tests/test_export.py

@@ -2,54 +2,69 @@
 import unittest
 import unittest.mock
 import io
+import shutil
 import os
 
 from pywal import export
 from pywal import util
 
 
-# Import colors.
 COLORS = util.read_file_json("tests/test_files/test_file.json")
 COLORS["colors"].update(COLORS["special"])
 
-util.create_dir("/tmp/wal")
+TMP_DIR = "/tmp/wal"
 
 
 class TestExportColors(unittest.TestCase):
     """Test the export functions."""
 
-    def test_all_templates(self):
-        """> Test substitutions in template file."""
-        export.every(COLORS, "/tmp/wal")
+    def setUp(self):
+        """> Setup export tests."""
+        util.create_dir(TMP_DIR)
 
-        result = os.path.isfile("/tmp/wal/colors.sh")
+    def tearDown(self):
+        """> Clean up export tests."""
+        shutil.rmtree(TMP_DIR, ignore_errors=True)
+
+    def is_file(self, tmp_file):
+        """> Test is something is a file."""
+        result = os.path.isfile(tmp_file)
         self.assertTrue(result)
 
-        with open("/tmp/wal/colors.sh") as file:
-            content = file.read().splitlines()
+    def is_file_contents(self, tmp_file, pattern):
+        """> Check for pattern in file."""
+        content = util.read_file(tmp_file)
+        self.assertEqual(content[7], pattern)
 
-        self.assertEqual(content[6], "foreground='#F5F1F4'")
+    def test_all_templates(self):
+        """> Test substitutions in template file."""
+        tmp_file = os.path.join(TMP_DIR, "colors.sh")
+        export.every(COLORS, TMP_DIR)
+
+        self.is_file(tmp_file)
+        self.is_file_contents(tmp_file, "foreground='#F5F1F4'")
 
     def test_css_template(self):
         """> Test substitutions in template file (css)."""
-        export.color(COLORS, "css", "/tmp/wal/test.css")
+        tmp_file = os.path.join(TMP_DIR, "test.css")
+        export.color(COLORS, "css", tmp_file)
 
-        result = os.path.isfile("/tmp/wal/test.css")
-        self.assertTrue(result)
+        self.is_file(tmp_file)
+        self.is_file_contents(tmp_file, "    --background: #1F211E;")
 
-        with open("/tmp/wal/test.css") as file:
-            content = file.read().splitlines()
 
-        self.assertEqual(content[6], "    --background: #1F211E;")
+class TestInvalidExport(unittest.TestCase):
+    """Test export function error handling."""
 
     def test_invalid_template(self):
         """> Test template validation."""
         error_msg = "warning: template 'dummy' doesn't exist."
+        tmp_file = os.path.join(TMP_DIR, "test.css")
 
         # Since this function prints a message on fail we redirect
         # it's output so that we can read it.
         with unittest.mock.patch('sys.stdout', new=io.StringIO()) as fake_out:
-            export.color(COLORS, "dummy", "/tmp/wal/test.css")
+            export.color(COLORS, "dummy", tmp_file)
             self.assertEqual(fake_out.getvalue().strip(), error_msg)