theme: Add missing styles to REQUIRED_STYLES and check completeness.

* 3 missing styles: 'muted', 'current_user', 'table_head' were added
to REQUIRED_STYLES.
* `complete_and_incomplete_themes` was amended to
check for equality instead of the superset criteria
* The completeness test for builtin themes was amended to check for
equality with REQUIRED_STYLES and existance of Colors.

tests/config/test_themes.py

@@ -6,6 +6,7 @@
     complete_and_incomplete_themes,
     generate_theme,
 )
+from zulipterminal.themes import gruvbox, zt_blue, zt_dark, zt_light
 from zulipterminal.themes._template import REQUIRED_STYLES
 
 
@@ -14,7 +15,6 @@
     "gruvbox_dark",
     "zt_light",
     "zt_blue",
-    "gruvbox_dark24",
 }
 
 
@@ -34,10 +34,14 @@ def test_all_themes():
 )
 def test_builtin_theme_completeness(theme_name):
     theme = THEMES[theme_name]
-    styles_in_theme = {style[0] for style in theme}
+    theme_styles = theme.STYLES
+    theme_colors = theme.Color
 
-    assert len(styles_in_theme) >= len(REQUIRED_STYLES)
-    assert all(required_style in styles_in_theme for required_style in REQUIRED_STYLES)
+    assert len(theme_styles) == len(REQUIRED_STYLES)
+    assert all(required_style in theme_styles for required_style in REQUIRED_STYLES)
+    for style_name, style_conf in theme_styles.items():
+        fg, bg = style_conf
+        assert fg in theme_colors and bg in theme_colors
 
 
 def test_complete_and_incomplete_themes():

zulipterminal/config/themes.py

@@ -36,7 +36,7 @@ def complete_and_incomplete_themes() -> Tuple[List[str], List[str]]:
     complete = {
         name
         for name, theme in THEMES.items()
-        if {s for s in theme.STYLES}.issuperset(REQUIRED_STYLES)
+        if theme.STYLES.keys() == REQUIRED_STYLES.keys()
     }
     incomplete = list(set(THEMES) - complete)
     return sorted(list(complete)), sorted(incomplete)

zulipterminal/themes/_template.py

@@ -103,11 +103,14 @@ class Color(Enum):
     'popup_category'  : 'bold',
     'unread_count'    : 'bold',
     'starred_count'   : '',
+    'table_head'      : 'bold',
     'filter_results'  : 'bold',
     'edit_topic'      : 'standout',
     'edit_tag'        : 'standout',
     'edit_author'     : 'bold',
     'edit_time'       : 'bold',
+    'current_user'    : '',
+    'muted'           : 'bold',
     'popup_border'    : 'bold',
     'area:help'       : 'standout',
     'area:msg'        : 'standout',