diff --git a/dexpreopt/dexpreopt_test.go b/dexpreopt/dexpreopt_test.go
new file mode 100644
index 0000000..5265248
--- /dev/null
+++ b/dexpreopt/dexpreopt_test.go
@@ -0,0 +1,208 @@
+// Copyright 2018 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package dexpreopt
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+)
+
+var testGlobalConfig = GlobalConfig{
+	DefaultNoStripping:                 false,
+	DisablePreoptModules:               nil,
+	OnlyPreoptBootImageAndSystemServer: false,
+	HasSystemOther:                     false,
+	PatternsOnSystemOther:              nil,
+	DisableGenerateProfile:             false,
+	BootJars:                           nil,
+	SystemServerJars:                   nil,
+	SystemServerApps:                   nil,
+	SpeedApps:                          nil,
+	PreoptFlags:                        nil,
+	DefaultCompilerFilter:              "",
+	SystemServerCompilerFilter:         "",
+	GenerateDMFiles:                    false,
+	NoDebugInfo:                        false,
+	AlwaysSystemServerDebugInfo:        false,
+	NeverSystemServerDebugInfo:         false,
+	AlwaysOtherDebugInfo:               false,
+	NeverOtherDebugInfo:                false,
+	MissingUsesLibraries:               nil,
+	IsEng:                              false,
+	SanitizeLite:                       false,
+	DefaultAppImages:                   false,
+	Dex2oatXmx:                         "",
+	Dex2oatXms:                         "",
+	EmptyDirectory:                     "",
+	DefaultDexPreoptImageLocation:      nil,
+	CpuVariant:                         nil,
+	InstructionSetFeatures:             nil,
+	Tools: Tools{
+		Profman:             "profman",
+		Dex2oat:             "dex2oat",
+		Aapt:                "aapt",
+		SoongZip:            "soong_zip",
+		Zip2zip:             "zip2zip",
+		VerifyUsesLibraries: "verify_uses_libraries.sh",
+		ConstructContext:    "construct_context.sh",
+	},
+}
+
+var testModuleConfig = ModuleConfig{
+	Name:                   "",
+	DexLocation:            "",
+	BuildPath:              "",
+	DexPath:                "",
+	PreferIntegrity:        false,
+	UncompressedDex:        false,
+	HasApkLibraries:        false,
+	PreoptFlags:            nil,
+	ProfileClassListing:    "",
+	ProfileIsTextListing:   false,
+	EnforceUsesLibraries:   false,
+	OptionalUsesLibraries:  nil,
+	UsesLibraries:          nil,
+	LibraryPaths:           nil,
+	Archs:                  nil,
+	DexPreoptImageLocation: "",
+	PreoptExtractedApk:     false,
+	NoCreateAppImage:       false,
+	ForceCreateAppImage:    false,
+	PresignedPrebuilt:      false,
+	StripInputPath:         "",
+	StripOutputPath:        "",
+}
+
+func TestDexPreopt(t *testing.T) {
+	global, module := testGlobalConfig, testModuleConfig
+
+	module.Name = "test"
+	module.DexLocation = "/system/app/test/test.apk"
+	module.BuildPath = "out/test/test.apk"
+	module.Archs = []string{"arm"}
+
+	rule, err := GenerateDexpreoptRule(global, module)
+	if err != nil {
+		t.Error(err)
+	}
+
+	wantInstalls := []Install{
+		{"out/test/oat/arm/package.odex", "/system/app/test/oat/arm/test.odex"},
+		{"out/test/oat/arm/package.vdex", "/system/app/test/oat/arm/test.vdex"},
+	}
+
+	if !reflect.DeepEqual(rule.Installs(), wantInstalls) {
+		t.Errorf("\nwant installs:\n   %v\ngot:\n   %v", wantInstalls, rule.Installs())
+	}
+}
+
+func TestDexPreoptSystemOther(t *testing.T) {
+	global, module := testGlobalConfig, testModuleConfig
+
+	global.HasSystemOther = true
+	global.PatternsOnSystemOther = []string{"app/%"}
+
+	module.Name = "test"
+	module.DexLocation = "/system/app/test/test.apk"
+	module.BuildPath = "out/test/test.apk"
+	module.Archs = []string{"arm"}
+
+	rule, err := GenerateDexpreoptRule(global, module)
+	if err != nil {
+		t.Error(err)
+	}
+
+	wantInstalls := []Install{
+		{"out/test/oat/arm/package.odex", "/system_other/app/test/oat/arm/test.odex"},
+		{"out/test/oat/arm/package.vdex", "/system_other/app/test/oat/arm/test.vdex"},
+	}
+
+	if !reflect.DeepEqual(rule.Installs(), wantInstalls) {
+		t.Errorf("\nwant installs:\n   %v\ngot:\n   %v", wantInstalls, rule.Installs())
+	}
+}
+
+func TestDexPreoptProfile(t *testing.T) {
+	global, module := testGlobalConfig, testModuleConfig
+
+	module.Name = "test"
+	module.DexLocation = "/system/app/test/test.apk"
+	module.BuildPath = "out/test/test.apk"
+	module.ProfileClassListing = "profile"
+	module.Archs = []string{"arm"}
+
+	rule, err := GenerateDexpreoptRule(global, module)
+	if err != nil {
+		t.Error(err)
+	}
+
+	wantInstalls := []Install{
+		{"out/test/profile.prof", "/system/app/test/test.apk.prof"},
+		{"out/test/oat/arm/package.art", "/system/app/test/oat/arm/test.art"},
+		{"out/test/oat/arm/package.odex", "/system/app/test/oat/arm/test.odex"},
+		{"out/test/oat/arm/package.vdex", "/system/app/test/oat/arm/test.vdex"},
+	}
+
+	if !reflect.DeepEqual(rule.Installs(), wantInstalls) {
+		t.Errorf("\nwant installs:\n   %v\ngot:\n   %v", wantInstalls, rule.Installs())
+	}
+}
+
+func TestStripDex(t *testing.T) {
+	global, module := testGlobalConfig, testModuleConfig
+
+	module.Name = "test"
+	module.DexLocation = "/system/app/test/test.apk"
+	module.BuildPath = "out/test/test.apk"
+	module.Archs = []string{"arm"}
+	module.StripInputPath = "$1"
+	module.StripOutputPath = "$2"
+
+	rule, err := GenerateStripRule(global, module)
+	if err != nil {
+		t.Error(err)
+	}
+
+	want := `zip2zip -i $1 -o $2 -x "classes*.dex"`
+	if len(rule.Commands()) < 1 || !strings.Contains(rule.Commands()[0], want) {
+		t.Errorf("\nwant commands[0] to have:\n   %v\ngot:\n   %v", want, rule.Commands()[0])
+	}
+}
+
+func TestNoStripDex(t *testing.T) {
+	global, module := testGlobalConfig, testModuleConfig
+
+	global.DefaultNoStripping = true
+
+	module.Name = "test"
+	module.DexLocation = "/system/app/test/test.apk"
+	module.BuildPath = "out/test/test.apk"
+	module.Archs = []string{"arm"}
+	module.StripInputPath = "$1"
+	module.StripOutputPath = "$2"
+
+	rule, err := GenerateStripRule(global, module)
+	if err != nil {
+		t.Error(err)
+	}
+
+	wantCommands := []string{
+		"cp -f $1 $2",
+	}
+	if !reflect.DeepEqual(rule.Commands(), wantCommands) {
+		t.Errorf("\nwant commands:\n   %v\ngot:\n   %v", wantCommands, rule.Commands())
+	}
+}