Added Cursor.At test

cursor/cursor_test.go

@@ -73,7 +73,17 @@ func testCursor[C cursor.Cursor[byte]](t *testing.T, makeCursor func([]byte) C)
 		test.ErrorIs(t, err, io.EOF)
 		test.EqOp(t, len(data), int(n))
 	}))
-	t.Run("At", Todo)
+	t.Run("At sets cursor position", rapid.MakeCheck(func(t *rapid.T) {
+		data := rapid.SliceOfN(rapid.Byte(), 1, 100).Draw(t, "data")
+		pos := rapid.Uint64Range(0, uint64(len(data)-1)).Draw(t, "pos")
+		c := makeCursor(data).At(pos)
+
+		dst := make([]byte, 1)
+		n, _, err := c.Read(dst)
+		test.EqOp(t, 1, n)
+		test.NoError(t, err)
+		test.EqOp(t, data[pos], dst[0])
+	}))
 }
 
 func TestSliceCursor(t *testing.T) {

go.mod

@@ -3,10 +3,8 @@ module git.codemonkeysoftware.net/b/gigaparsec
 go 1.23
 
 require (
-	github.com/shoenig/test v1.9.1
+	github.com/shoenig/test v1.10.0
 	pgregory.net/rapid v1.1.0
 )
 
 require github.com/google/go-cmp v0.6.0 // indirect
-
-replace github.com/shoenig/test v1.9.1 => ../shoenig-test

go.sum

@@ -1,4 +1,6 @@
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/shoenig/test v1.10.0 h1:cf/OnhhbkMnJ0uk39OUwbY+x/OT5x20D69pdNACeBwc=
+github.com/shoenig/test v1.10.0/go.mod h1:UxJ6u/x2v/TNs/LoLxBNJRV9DiwBBKYxXSyczsBHFoI=
 pgregory.net/rapid v1.1.0 h1:CMa0sjHSru3puNx+J0MIAuiiEV4N0qj8/cMWGBBCsjw=
 pgregory.net/rapid v1.1.0/go.mod h1:PY5XlDGj0+V1FCq0o192FdRhpKHGTRIWBgqjDBTrq04=