diff --git a/tests/test_math_format.py b/tests/test_math_format.py
index 93def03..d1d547b 100644
--- a/tests/test_math_format.py
+++ b/tests/test_math_format.py
@@ -1,10 +1,10 @@
 import pytest
 
-from ai_typewriter.math_format import format_math_text, split_word_equation_segments
+from ai_typewriter.math_format import format_math_text
 
 
-def test_plain_mode_keeps_linear_math_literal():
-    assert format_math_text("z_1 + x^2", "plain") == "z_1 + x^2"
+def test_plain_mode_keeps_latex_and_markers_literal():
+    assert format_math_text(r"[EQ]\frac{a}{b}[/EQ]", "plain") == r"[EQ]\frac{a}{b}[/EQ]"
 
 
 def test_unicode_mode_converts_indices_exponents_and_symbols():
@@ -13,35 +13,6 @@ def test_unicode_mode_converts_indices_exponents_and_symbols():
     assert result == "z₁ + x² + xᵢ₊₁ + α + ∞"
 
 
-def test_marker_mode_only_uses_explicit_equation_blocks():
-    segments = split_word_equation_segments(r"On pose [EQ]z_1 = x + iy[/EQ]. Puis [EQ]\alpha = 2[/EQ].")
-
-    assert [(segment.kind, segment.value) for segment in segments] == [
-        ("text", "On pose "),
-        ("equation", "z_1 = x + iy"),
-        ("text", ". Puis "),
-        ("equation", r"\alpha = 2"),
-        ("text", "."),
-    ]
-
-
-def test_marker_mode_does_not_guess_math_without_markers():
-    segments = split_word_equation_segments(r"z_1 reste du texte normal sans marqueur.")
-
-    assert [(segment.kind, segment.value) for segment in segments] == [
-        ("text", r"z_1 reste du texte normal sans marqueur."),
-    ]
-
-
-def test_unclosed_equation_marker_consumes_the_rest():
-    segments = split_word_equation_segments(r"Résultat: [EQ]x^2 + 1")
-
-    assert [(segment.kind, segment.value) for segment in segments] == [
-        ("text", "Résultat: "),
-        ("equation", "x^2 + 1"),
-    ]
-
-
 def test_invalid_math_text_format_is_rejected():
     with pytest.raises(ValueError):
         format_math_text("x_1", "bad")