Add createProcessBuilder test case

Author: lfir

src/test/java/cf/maybelambda/fedora/PostInstallUpdaterTests.java

@@ -24,6 +24,18 @@ void setUp() {
         this.mockBuilder = mock(ProcessBuilder.class);
     }
 
+    @Test
+    void createProcessBuilderReturnsProcessBuilderWithExpectedCommand() {
+        String[] expectedCommand = {"ls", "-la"};
+        ProcessBuilder mockBuilder = mock(ProcessBuilder.class);
+        Mockito.doReturn(mockBuilder).when(updater).createProcessBuilder(expectedCommand);
+        
+        ProcessBuilder result = updater.createProcessBuilder(expectedCommand);
+        
+        assertEquals(mockBuilder, result);
+        Mockito.verify(updater).createProcessBuilder(expectedCommand);
+    }
+
     @Test
     void runCommandReturnsStatusCodeOfCommandExecuted() throws Exception {
         Process mockProcess = mock(Process.class);