diff --git a/src/textual/_resolve.py b/src/textual/_resolve.py
index 7193931b5..cf10dfcb5 100644
--- a/src/textual/_resolve.py
+++ b/src/textual/_resolve.py
@@ -71,32 +71,3 @@ def resolve(
     ]
 
     return results
-
-
-if __name__ == "__main__":
-
-    dimensions = [Scalar.parse("3"), Scalar.parse("1fr"), Scalar.parse("1")]
-
-    print(resolve(dimensions, 20, 1, Size(40, 20), Size(40, 20)))
-
-    print(
-        resolve(
-            [Scalar.parse("1fr"), Scalar.parse("1fr")],
-            20,
-            1,
-            Size(40, 20),
-            Size(40, 20),
-        )
-    )
-
-    print(
-        resolve(
-            [
-                Scalar.parse("1fr"),
-            ],
-            20,
-            1,
-            Size(40, 20),
-            Size(40, 20),
-        )
-    )
diff --git a/tests/test_resolve.py b/tests/test_resolve.py
new file mode 100644
index 000000000..4fac5ded2
--- /dev/null
+++ b/tests/test_resolve.py
@@ -0,0 +1,58 @@
+import pytest
+
+from textual.geometry import Size
+from textual.css.scalar import Scalar
+from textual._resolve import resolve
+
+
+def test_resolve_empty():
+    assert resolve([], 10, 1, Size(20, 10), Size(80, 24)) == []
+
+
+@pytest.mark.parametrize(
+    "scalars,total,gutter,result",
+    [
+        (["10"], 100, 0, [(0, 10)]),
+        (
+            ["10", "20"],
+            100,
+            0,
+            [(0, 10), (10, 20)],
+        ),
+        (
+            ["10", "20"],
+            100,
+            1,
+            [(0, 10), (11, 20)],
+        ),
+        (
+            ["10", "1fr"],
+            100,
+            1,
+            [(0, 10), (11, 89)],
+        ),
+        (
+            ["1fr", "1fr"],
+            100,
+            0,
+            [(0, 50), (50, 50)],
+        ),
+        (
+            ["3", "1fr", "1fr", "1"],
+            100,
+            1,
+            [(0, 3), (4, 46), (51, 47), (99, 1)],
+        ),
+    ],
+)
+def test_resolve(scalars, total, gutter, result):
+    assert (
+        resolve(
+            [Scalar.parse(scalar) for scalar in scalars],
+            total,
+            gutter,
+            Size(40, 20),
+            Size(80, 24),
+        )
+        == result
+    )