added a new test case

fpm.toml

@@ -7,17 +7,12 @@ homepage = "https://github.com/jacobwilliams/daglib"
 keywords = ["graph theory", "graphviz", "DAG"]
 
 [build]
-auto-executables = false
-auto-examples = false
-auto-tests = false
+auto-executables = true
+auto-examples = true
+auto-tests = true
 
 [library]
 source-dir = "src"
 
 [install]
 library = true
-
-[[test]]
-name = "dag_example"
-source-dir = "tests"
-main = "dag_example.f90"

test/dag_example_2.f90

@@ -0,0 +1,82 @@
+!*******************************************************************************
+!>
+!  DAG module test program.
+
+    program dag_example_2
+
+    use dag_module
+
+    implicit none
+
+    type(dag) :: d
+    integer,dimension(:),allocatable :: order
+    integer :: istat
+    integer :: i,r,c
+    logical,dimension(:,:),allocatable :: mat !! dependency matrix
+
+    integer,parameter :: n_nodes = 12
+    character(len=*),parameter :: filetype = 'pdf'  !! filetype for output plot ('pdf', png', etc.)
+    character(len=*),dimension(n_nodes),parameter :: labels = ['yb   ', &
+                                                               'pi   ', &
+                                                               'jg   ', &
+                                                               'ej   ', &
+                                                               'KN   ', &
+                                                               'LD   ', &
+                                                               'start', &
+                                                               'end  ', &
+                                                               'UF   ', &
+                                                               'xd   ', &
+                                                               'qx   ', &
+                                                               'DM   ']
+
+    call d%set_vertices(n_nodes, labels=labels)
+
+    call d%set_edges( 1  , [2,5,10 ] )    !  [penwidth=1, arrowhead=none];
+    call d%set_edges( 3  , [4,5,6,1] )    !  [penwidth=1, arrowhead=none]
+    call d%set_edges( 4  , [11,6   ] )    !  [penwidth=1, arrowhead=none]
+    call d%set_edges( 6  , [7      ] )    !  [penwidth=1, arrowhead=none]
+    call d%set_edges( 7  , [11,4   ] )    !  [penwidth=1, arrowhead=none]
+    call d%set_edges( 8  , [9,5    ] )    !  [penwidth=1, arrowhead=none]
+    call d%set_edges( 9  , [1,3    ] )    !  [penwidth=1, arrowhead=none]
+    call d%set_edges( 10 , [8,6,9  ] )    !  [penwidth=1, arrowhead=none]
+    call d%set_edges( 11 , [1,6,9,3] )    !  [penwidth=1, arrowhead=none]
+    call d%set_edges( 12 , [10     ] )    !  [penwidth=1, arrowhead=none]
+
+    ! [penwidth=1, arrowhead=none]
+
+    do i = 1, n_nodes
+        if (i==7 .or. i==8) then
+            call d%set_vertex_info(i,label=labels(i), attributes="shape=square,fillcolor=SlateGray1,style=filled")
+        else
+            call d%set_vertex_info(i,attributes="shape=circle,fillcolor=cornsilk,style=filled")
+        end if
+    end do
+
+    write(*,*) ''
+    write(*,*) 'diagraph:'
+    write(*,*) ''
+
+    call d%save_digraph('test2.dot','RL',300)
+    call execute_command_line('cat test2.dot')
+    call execute_command_line('dot -T'//filetype//' -o test2.'//filetype//' test2.dot')
+
+    write(*,*) ''
+    write(*,*) 'dependency matrix:'
+    write(*,*) ''
+    call d%generate_dependency_matrix(mat)
+    do r=1,n_nodes
+        do c=1,n_nodes
+            if (mat(r,c)) then
+                write(*,'(A)',advance='NO') 'X'
+            else
+                write(*,'(A)',advance='NO') 'O'
+            end if
+        end do
+            write(*,'(A)') ''
+    end do
+
+    ! cleanup:
+    call d%destroy()
+
+    end program dag_example_2
+!*******************************************************************************