refactoring test_box_substitute: smaller and focused tests are better than large ones

tests/test_box.py

@@ -48,7 +48,26 @@ def test_get_bottom():
     assert bottom == "┗━┻━━┻━━━┛"
 
 
-def test_box_substitute():
+def test_box_substitute_for_same_box():
+    options = ConsoleOptions(
+        ConsoleDimensions(80, 25),
+        legacy_windows=False,
+        min_width=1,
+        max_width=100,
+        is_terminal=True,
+        encoding="utf-8",
+        max_height=25,
+    )
+
+    assert ROUNDED.substitute(options) == ROUNDED
+    assert MINIMAL_HEAVY_HEAD.substitute(options) == MINIMAL_HEAVY_HEAD
+    assert SIMPLE_HEAVY.substitute(options) == SIMPLE_HEAVY
+    assert HEAVY.substitute(options) == HEAVY
+    assert HEAVY_EDGE.substitute(options) == HEAVY_EDGE
+    assert HEAVY_HEAD.substitute(options) == HEAVY_HEAD
+
+
+def test_box_substitute_for_different_box_legacy_windows():
     options = ConsoleOptions(
         ConsoleDimensions(80, 25),
         legacy_windows=True,
@@ -59,7 +78,6 @@ def test_box_substitute():
         max_height=25,
     )
 
-    # A different Box due to legacy_windows
     assert ROUNDED.substitute(options) == SQUARE
     assert MINIMAL_HEAVY_HEAD.substitute(options) == MINIMAL
     assert SIMPLE_HEAVY.substitute(options) == SIMPLE
@@ -67,17 +85,18 @@ def test_box_substitute():
     assert HEAVY_EDGE.substitute(options) == SQUARE
     assert HEAVY_HEAD.substitute(options) == SQUARE
 
-    # The same box
-    options.legacy_windows = False
-    assert ROUNDED.substitute(options) == ROUNDED
-    assert MINIMAL_HEAVY_HEAD.substitute(options) == MINIMAL_HEAVY_HEAD
-    assert SIMPLE_HEAVY.substitute(options) == SIMPLE_HEAVY
-    assert HEAVY.substitute(options) == HEAVY
-    assert HEAVY_EDGE.substitute(options) == HEAVY_EDGE
-    assert HEAVY_HEAD.substitute(options) == HEAVY_HEAD
 
-    # A different Box due to ascii encoding
-    options.encoding = "ascii"
+def test_box_substitute_for_different_box_ascii_encoding():
+    options = ConsoleOptions(
+        ConsoleDimensions(80, 25),
+        legacy_windows=True,
+        min_width=1,
+        max_width=100,
+        is_terminal=True,
+        encoding="ascii",
+        max_height=25,
+    )
+
     assert ROUNDED.substitute(options) == ASCII
     assert MINIMAL_HEAVY_HEAD.substitute(options) == ASCII
     assert SIMPLE_HEAVY.substitute(options) == ASCII