1 files changed, 27 insertions, 0 deletions
diff --git a/src/test/java/simulator/VSMainTest.java b/src/test/java/simulator/VSMainTest.java
new file mode 100644
index 0000000..5d4fb8b
--- /dev/null
+++ b/src/test/java/simulator/VSMainTest.java
@@ -0,0 +1,27 @@
+package simulator;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import org.junit.jupiter.api.Test;
+
+public class VSMainTest {
+    @Test
+    void resolveStartupSimulationFileReturnsNullForMissingArgs() {
+        assertNull(VSMain.resolveStartupSimulationFile(null));
+        assertNull(VSMain.resolveStartupSimulationFile(new String[0]));
+        assertNull(VSMain.resolveStartupSimulationFile(new String[] {""}));
+        assertNull(VSMain.resolveStartupSimulationFile(new String[] {"   "}));
+    }
+
+    @Test
+    void resolveStartupSimulationFileUsesFirstArgument() {
+        assertEquals("saved-simulations/raft.dat",
+                     VSMain.resolveStartupSimulationFile(
+                         new String[] {"saved-simulations/raft.dat"}));
+        assertEquals("saved-simulations/raft.dat",
+                     VSMain.resolveStartupSimulationFile(
+                         new String[] {"  saved-simulations/raft.dat  ",
+                                       "ignored"}));
+    }
+}