diff --git a/t/regression/chart_line07.t b/t/regression/chart_line07.t
new file mode 100644
index 00000000..b0bd3819
--- /dev/null
+++ b/t/regression/chart_line07.t
@@ -0,0 +1,95 @@
+###############################################################################
+#
+# Tests the output of Excel::Writer::XLSX against Excel generated files.
+#
+# Copyright 2000-2024, John McNamara, jmcnamara@cpan.org
+#
+# SPDX-License-Identifier: Artistic-1.0-Perl OR GPL-1.0-or-later
+#
+
+use lib 't/lib';
+use TestFunctions qw(_compare_xlsx_files _is_deep_diff);
+use strict;
+use warnings;
+
+use Test::More tests => 1;
+
+###############################################################################
+#
+# Tests setup.
+#
+my $filename     = 'chart_line07.xlsx';
+my $dir          = 't/regression/';
+my $got_filename = $dir . "ewx_$filename";
+my $exp_filename = $dir . 'xlsx_files/' . $filename;
+
+my $ignore_members  = [];
+
+my $ignore_elements = { 'xl/charts/chart1.xml' => [ '<c:crosses' ] };
+
+###############################################################################
+#
+# Test the creation of a simple Excel::Writer::XLSX file.
+#
+use Excel::Writer::XLSX;
+
+my $workbook  = Excel::Writer::XLSX->new( $got_filename );
+my $worksheet = $workbook->add_worksheet();
+my $chart    = $workbook->add_chart( type => 'line', embedded => 1 );
+
+# For testing, copy the randomly generated axis ids in the target xlsx file.
+$chart->{_axis_ids} = [ 77034624, 77036544 ];
+$chart->{_axis2_ids} = [ 95388032, 103040896 ];
+
+my $data = [
+    [ 1,  2,  3,  4,  5  ],
+    [ 10, 40, 50, 20, 10 ],
+    [ 1,  2,  3,  4,  5,  6,  7  ],
+    [ 30, 10, 20, 40, 30, 10, 20 ],
+
+];
+
+$worksheet->write( 'A1', $data );
+
+
+$chart->add_series(
+    categories => '=Sheet1!$A$1:$A$5',
+    values     => '=Sheet1!$B$1:$B$5',
+);
+
+$chart->add_series(
+    categories => '=Sheet1!$C$1:$C$7',
+    values     => '=Sheet1!$D$1:$D$7',
+    y2_axis => 1,
+);
+
+$chart->set_x2_axis( label_position => 'next_to' );
+
+$worksheet->insert_chart( 'E9', $chart );
+
+$workbook->close();
+
+
+###############################################################################
+#
+# Compare the generated and existing Excel files.
+#
+
+my ( $got, $expected, $caption ) = _compare_xlsx_files(
+
+    $got_filename,
+    $exp_filename,
+    $ignore_members,
+    $ignore_elements,
+);
+
+_is_deep_diff( $got, $expected, $caption );
+
+
+###############################################################################
+#
+# Cleanup.
+#
+unlink $got_filename;
+
+__END__
diff --git a/t/regression/chart_line08.t b/t/regression/chart_line08.t
new file mode 100644
index 00000000..9a20cbe4
--- /dev/null
+++ b/t/regression/chart_line08.t
@@ -0,0 +1,97 @@
+###############################################################################
+#
+# Tests the output of Excel::Writer::XLSX against Excel generated files.
+#
+# Copyright 2000-2024, John McNamara, jmcnamara@cpan.org
+#
+# SPDX-License-Identifier: Artistic-1.0-Perl OR GPL-1.0-or-later
+#
+
+use lib 't/lib';
+use TestFunctions qw(_compare_xlsx_files _is_deep_diff);
+use strict;
+use warnings;
+
+use Test::More tests => 1;
+
+###############################################################################
+#
+# Tests setup.
+#
+my $filename     = 'chart_line08.xlsx';
+my $dir          = 't/regression/';
+my $got_filename = $dir . "ewx_$filename";
+my $exp_filename = $dir . 'xlsx_files/' . $filename;
+
+my $ignore_members  = [];
+
+my $ignore_elements = {};
+
+###############################################################################
+#
+# Test the creation of a simple Excel::Writer::XLSX file.
+#
+use Excel::Writer::XLSX;
+
+my $workbook  = Excel::Writer::XLSX->new( $got_filename );
+my $worksheet = $workbook->add_worksheet();
+my $chart    = $workbook->add_chart( type => 'line', embedded => 1 );
+
+# For testing, copy the randomly generated axis ids in the target xlsx file.
+$chart->{_axis_ids} = [ 77034624, 77036544 ];
+$chart->{_axis2_ids} = [ 95388032, 103040896 ];
+
+my $data = [
+    [ 1,  2,  3,  4,  5  ],
+    [ 10, 40, 50, 20, 10 ],
+    [ 1,  2,  3,  4,  5,  6,  7  ],
+    [ 30, 10, 20, 40, 30, 10, 20 ],
+
+];
+
+$worksheet->write( 'A1', $data );
+
+
+$chart->add_series(
+    categories => '=Sheet1!$A$1:$A$5',
+    values     => '=Sheet1!$B$1:$B$5',
+);
+
+$chart->add_series(
+    categories => '=Sheet1!$C$1:$C$7',
+    values     => '=Sheet1!$D$1:$D$7',
+    y2_axis => 1,
+);
+
+
+$chart->set_x2_axis( label_position => 'next_to', visible => 1,  position => 'top' );
+$chart->set_y2_axis( crossing => 'max' );
+
+$worksheet->insert_chart( 'E9', $chart );
+
+$workbook->close();
+
+
+###############################################################################
+#
+# Compare the generated and existing Excel files.
+#
+
+my ( $got, $expected, $caption ) = _compare_xlsx_files(
+
+    $got_filename,
+    $exp_filename,
+    $ignore_members,
+    $ignore_elements,
+);
+
+_is_deep_diff( $got, $expected, $caption );
+
+
+###############################################################################
+#
+# Cleanup.
+#
+unlink $got_filename;
+
+__END__
diff --git a/t/regression/xlsx_files/chart_line07.xlsx b/t/regression/xlsx_files/chart_line07.xlsx
new file mode 100644
index 00000000..a090bbe5
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diff --git a/t/regression/xlsx_files/chart_line08.xlsx b/t/regression/xlsx_files/chart_line08.xlsx
new file mode 100644
index 00000000..50f2dd49
Binary files /dev/null and b/t/regression/xlsx_files/chart_line08.xlsx differ