diff --git a/tests/data/target/target_demo_1.csv b/tests/data/target/target_demo_1.csv
new file mode 100644
index 0000000..ff2b305
--- /dev/null
+++ b/tests/data/target/target_demo_1.csv
@@ -0,0 +1,11 @@
+wavelength,spectral flux density
+200,1.1e-15
+201,1.2e-15
+202,1.3e-15
+203,1.4e-15
+204,1.5e-15
+205,1.6e-15
+206,1.7e-15
+207,1.8e-15
+208,1.9e-15
+209,2.0e-15