Adding DAG testing draft

golden/dag.go

@@ -0,0 +1,75 @@
+package golden
+
+import "testing"
+
+type DagTestCase struct {
+	name   string
+	needs  []string
+	config BashConfig
+	path   string
+}
+
+// DagTest runs a set of test cases in topological order.
+// Each test case is a BashTest, and the test cases are connected by their
+// dependencies. If a test case has dependencies, it will only be run after all
+// of its dependencies have been run.
+//
+// Sample usage:
+//
+//	cases := []golden.DagTestCase{
+//	  {
+//	    name:   "app-create",
+//	    needs:  []string{},
+//	    config: BashConfig{ /**/ },
+//	    path:   "app-create",
+//	  },
+//	  {
+//	    name:   "app-push",
+//	    needs:  []string{"app-create"},
+//	    config: BashConfig{ /**/ },
+//	    path:   "app-push",
+//	  },
+//	}
+//	golden.DagTest(t, cases)
+func DagTest(t *testing.T, cases []DagTestCase) {
+	open := cases
+	done := make(map[string]bool)
+
+	for len(open) > 0 {
+		// Pick the first case from the open list that has all its needs met.
+		var next DagTestCase
+		for _, c := range open {
+			ready := true
+			for _, need := range c.needs {
+				if !done[need] {
+					ready = false
+					break
+				}
+			}
+			if ready {
+				next = c
+				break
+			}
+		}
+
+		// If we didn't find a case to run, we have a cycle.
+		if next.name == "" {
+			t.Fatal("cycle detected")
+		}
+
+		// Run the case and mark it as done.
+		t.Run(next.name, func(t *testing.T) {
+			// Run the test case.
+			BashTest(t, next.path, next.config)
+		})
+		done[next.name] = true
+
+		// Remove the case from the open list.
+		for i, c := range open {
+			if c.name == next.name {
+				open = append(open[:i], open[i+1:]...)
+				break
+			}
+		}
+	}
+}