Move test_styles into css test folder

tests/css/test_styles.py

@@ -0,0 +1,128 @@
+from rich.color import Color
+from rich.style import Style
+
+from textual.css.styles import Styles, RenderStyles
+
+
+def test_styles_reset():
+    styles = Styles()
+    styles.text_style = "not bold"
+    assert styles.text_style == Style(bold=False)
+    styles.reset()
+    assert styles.text_style is Style.null()
+
+
+def test_has_rule():
+    styles = Styles()
+    assert not styles.has_rule("text_style")
+    styles.text_style = "bold"
+    assert styles.has_rule("text_style")
+    styles.text_style = None
+    assert not styles.has_rule("text_style")
+
+
+def test_clear_rule():
+    styles = Styles()
+    styles.text_style = "bold"
+    assert styles.has_rule("text_style")
+    styles.clear_rule("text_style")
+    assert not styles.has_rule("text_style")
+
+
+def test_get_rules():
+    styles = Styles()
+    # Empty rules at start
+    assert styles.get_rules() == {}
+    styles.text_style = "bold"
+    assert styles.get_rules() == {"text_style": Style.parse("bold")}
+    styles.display = "none"
+    assert styles.get_rules() == {
+        "text_style": Style.parse("bold"),
+        "display": "none",
+    }
+
+
+def test_set_rule():
+    styles = Styles()
+    assert styles.get_rules() == {}
+    styles.set_rule("text_style", Style.parse("bold"))
+    assert styles.get_rules() == {"text_style": Style.parse("bold")}
+
+
+def test_reset():
+    styles = Styles()
+    assert styles.get_rules() == {}
+    styles.set_rule("text_style", Style.parse("bold"))
+    assert styles.get_rules() == {"text_style": Style.parse("bold")}
+    styles.reset()
+    assert styles.get_rules() == {}
+
+
+def test_merge():
+    styles = Styles()
+    styles.set_rule("text_style", Style.parse("bold"))
+    styles2 = Styles()
+    styles2.set_rule("display", "none")
+    styles.merge(styles2)
+    assert styles.get_rules() == {
+        "text_style": Style.parse("bold"),
+        "display": "none",
+    }
+
+
+def test_merge_rules():
+    styles = Styles()
+    styles.set_rule("text_style", Style.parse("bold"))
+    styles.merge_rules({"display": "none"})
+    assert styles.get_rules() == {
+        "text_style": Style.parse("bold"),
+        "display": "none",
+    }
+
+
+def test_render_styles_text():
+    """Test inline styles override base styles"""
+    base = Styles()
+    inline = Styles()
+    styles_view = RenderStyles(None, base, inline)
+
+    # Both styles are empty
+    assert styles_view.text == Style()
+
+    # Base is bold blue
+    base.text_color = "blue"
+    base.text_style = "bold"
+    assert styles_view.text == Style.parse("bold blue")
+
+    # Base is bold blue, inline is red
+    inline.text_color = "red"
+    assert styles_view.text == Style.parse("bold red")
+
+    # Base is bold yellow, inline is red
+    base.text_color = "yellow"
+    assert styles_view.text == Style.parse("bold red")
+
+    # Base is bold blue
+    inline.text_color = None
+    assert styles_view.text == Style.parse("bold yellow")
+
+
+def test_render_styles_border():
+    base = Styles()
+    inline = Styles()
+    styles_view = RenderStyles(None, base, inline)
+
+    base.border_top = ("heavy", "red")
+    # Base has border-top: heavy red
+    assert styles_view.border_top == ("heavy", Color.parse("red"))
+
+    inline.border_left = ("rounded", "green")
+    # Base has border-top heavy red, inline has border-left: rounded green
+    assert styles_view.border_top == ("heavy", Color.parse("red"))
+    assert styles_view.border_left == ("rounded", Color.parse("green"))
+    assert styles_view.border == (
+        ("heavy", Color.parse("red")),
+        ("", Color.default()),
+        ("", Color.default()),
+        ("rounded", Color.parse("green")),
+    )