Add subsystems package and make modules able to be turned off and on

modules/mgmt_test.go

@@ -0,0 +1,165 @@
+package modules
+
+import (
+	"testing"
+)
+
+func testModuleMgmt(t *testing.T) {
+
+	// enable module management
+	EnableModuleManagement(nil)
+
+	registerTestModule(t, "base")
+	registerTestModule(t, "feature1", "base")
+	registerTestModule(t, "base2", "base")
+	registerTestModule(t, "feature2", "base2")
+	registerTestModule(t, "sub-feature", "base")
+	registerTestModule(t, "feature3", "sub-feature")
+	registerTestModule(t, "feature4", "sub-feature")
+
+	// enable core module
+	core := modules["base"]
+	core.Enable()
+
+	// start and check order
+	err := Start()
+	if err != nil {
+		t.Error(err)
+	}
+	if changeHistory != " on:base" {
+		t.Errorf("order mismatch, was %s", changeHistory)
+	}
+	changeHistory = ""
+
+	// enable feature1
+	feature1 := modules["feature1"]
+	feature1.Enable()
+	// manage modules and check
+	err = ManageModules()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	if changeHistory != " on:feature1" {
+		t.Errorf("order mismatch, was %s", changeHistory)
+	}
+	changeHistory = ""
+
+	// enable feature2
+	feature2 := modules["feature2"]
+	feature2.Enable()
+	// manage modules and check
+	err = ManageModules()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	if changeHistory != " on:base2 on:feature2" {
+		t.Errorf("order mismatch, was %s", changeHistory)
+	}
+	changeHistory = ""
+
+	// enable feature3
+	feature3 := modules["feature3"]
+	feature3.Enable()
+	// manage modules and check
+	err = ManageModules()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	if changeHistory != " on:sub-feature on:feature3" {
+		t.Errorf("order mismatch, was %s", changeHistory)
+	}
+	changeHistory = ""
+
+	// enable feature4
+	feature4 := modules["feature4"]
+	feature4.Enable()
+	// manage modules and check
+	err = ManageModules()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	if changeHistory != " on:feature4" {
+		t.Errorf("order mismatch, was %s", changeHistory)
+	}
+	changeHistory = ""
+
+	// disable feature1
+	feature1.Disable()
+	// manage modules and check
+	err = ManageModules()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	if changeHistory != " off:feature1" {
+		t.Errorf("order mismatch, was %s", changeHistory)
+	}
+	changeHistory = ""
+
+	// disable feature3
+	feature3.Disable()
+	// manage modules and check
+	err = ManageModules()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	// disable feature4
+	feature4.Disable()
+	// manage modules and check
+	err = ManageModules()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	if changeHistory != " off:feature3 off:feature4 off:sub-feature" {
+		t.Errorf("order mismatch, was %s", changeHistory)
+	}
+	changeHistory = ""
+
+	// enable feature4
+	feature4.Enable()
+	// manage modules and check
+	err = ManageModules()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	if changeHistory != " on:sub-feature on:feature4" {
+		t.Errorf("order mismatch, was %s", changeHistory)
+	}
+	changeHistory = ""
+
+	// disable feature4
+	feature4.Disable()
+	// manage modules and check
+	err = ManageModules()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+	if changeHistory != " off:feature4 off:sub-feature" {
+		t.Errorf("order mismatch, was %s", changeHistory)
+	}
+	changeHistory = ""
+
+	err = Shutdown()
+	if err != nil {
+		t.Error(err)
+	}
+	if changeHistory != " off:feature2 off:base2 off:base" {
+		t.Errorf("order mismatch, was %s", changeHistory)
+	}
+
+	// reset history
+	changeHistory = ""
+
+	// disable module management
+	moduleMgmtEnabled.UnSet()
+
+	resetTestEnvironment()
+}