WIP: add tests

tests/example_flows.rs

@@ -0,0 +1,25 @@
+use petgraph::prelude::StableGraph;
+
+
+// Example taken from: https://en.wikipedia.org/wiki/Dinic%27s_algorithm#Example
+#[test]
+fn test_maxflow_small_graph() {
+    let mut g: StableGraph<(f32, f32), (u64, u64)> = StableGraph::new();
+    let s = g.add_node((0., 5.));
+    let one = g.add_node((10., 0.));
+    let two = g.add_node((10., 10.));
+    let three = g.add_node((20., 0.));
+    let four = g.add_node((20., 10.));
+    let t = g.add_node((30., 5.));
+    g.add_edge(s, one, (0, 10));
+    g.add_edge(s, two, (0, 10));
+    g.add_edge(one, three, (0, 4));
+    g.add_edge(one, four, (0, 8));
+    g.add_edge(one, two, (0,2));
+    g.add_edge(two, four, (0,9));
+    g.add_edge(three, t, (0,10));
+    g.add_edge(four, three, (0,6));
+    g.add_edge(four, t, (0,10));
+
+    // TODO: 
+}

tests/valid_flow.rs

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+// check capacity at each edge (incoming flows = outgoing flows)
+// check capacity isn't violated (flow <= capacity)