Implement bp2build for the `license` module

Also, add ExpectedRuleTarget type to simplify bp2build testing

Bug: 190817312
Test: treehugger
Change-Id: Id3a642680d3518d36360ba957919a6fc96222672
diff --git a/bp2build/Android.bp b/bp2build/Android.bp
index 3d9fc5a..8aef66f 100644
--- a/bp2build/Android.bp
+++ b/bp2build/Android.bp
@@ -63,6 +63,7 @@
         "java_library_host_conversion_test.go",
         "java_plugin_conversion_test.go",
         "java_proto_conversion_test.go",
+        "license_conversion_test.go",
         "linker_config_conversion_test.go",
         "ndk_headers_conversion_test.go",
         "performance_test.go",
diff --git a/bp2build/license_conversion_test.go b/bp2build/license_conversion_test.go
new file mode 100644
index 0000000..ea6b27a
--- /dev/null
+++ b/bp2build/license_conversion_test.go
@@ -0,0 +1,81 @@
+// Copyright 2022 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 bp2build
+
+import (
+	"android/soong/android"
+	"testing"
+)
+
+func registerLicenseModuleTypes(_ android.RegistrationContext) {}
+
+func TestLicenseBp2Build(t *testing.T) {
+	tests := []struct {
+		description string
+		module      string
+		expected    ExpectedRuleTarget
+	}{
+		{
+			description: "license kind and text notice",
+			module: `
+license {
+    name: "my_license",
+    license_kinds: [ "SPDX-license-identifier-Apache-2.0"],
+    license_text: [ "NOTICE"],
+}`,
+			expected: ExpectedRuleTarget{
+				"android_license",
+				"my_license",
+				AttrNameToString{
+					"license_kinds": `["SPDX-license-identifier-Apache-2.0"]`,
+					"license_text":  `"NOTICE"`,
+				},
+				android.HostAndDeviceDefault,
+			},
+		},
+		{
+			description: "visibility, package_name, copyright_notice",
+			module: `
+license {
+	name: "my_license",
+    package_name: "my_package",
+    visibility: [":__subpackages__"],
+    copyright_notice: "Copyright © 2022",
+}`,
+			expected: ExpectedRuleTarget{
+				"android_license",
+				"my_license",
+				AttrNameToString{
+					"copyright_notice": `"Copyright © 2022"`,
+					"package_name":     `"my_package"`,
+					"visibility":       `[":__subpackages__"]`,
+				},
+				android.HostAndDeviceDefault,
+			},
+		},
+	}
+
+	for _, test := range tests {
+		RunBp2BuildTestCase(t,
+			registerLicenseModuleTypes,
+			Bp2buildTestCase{
+				Description:                test.description,
+				ModuleTypeUnderTest:        "license",
+				ModuleTypeUnderTestFactory: android.LicenseFactory,
+				Blueprint:                  test.module,
+				ExpectedBazelTargets:       []string{test.expected.String()},
+			})
+	}
+}
diff --git a/bp2build/testing.go b/bp2build/testing.go
index ee9200a..edc5c4a 100644
--- a/bp2build/testing.go
+++ b/bp2build/testing.go
@@ -141,7 +141,7 @@
 		android.FailIfErrored(t, errs)
 	}
 	if actualCount, expectedCount := len(bazelTargets), len(tc.ExpectedBazelTargets); actualCount != expectedCount {
-		t.Errorf("%s: Expected %d bazel target (%s), got `%d`` (%s)",
+		t.Errorf("%s: Expected %d bazel target (%s), got %d (%s)",
 			tc.Description, expectedCount, tc.ExpectedBazelTargets, actualCount, bazelTargets)
 	} else {
 		for i, target := range bazelTargets {
@@ -452,3 +452,14 @@
 func MakeBazelTarget(typ, name string, attrs AttrNameToString) string {
 	return makeBazelTargetHostOrDevice(typ, name, attrs, android.DeviceSupported)
 }
+
+type ExpectedRuleTarget struct {
+	Rule  string
+	Name  string
+	Attrs AttrNameToString
+	Hod   android.HostOrDeviceSupported
+}
+
+func (ebr ExpectedRuleTarget) String() string {
+	return makeBazelTargetHostOrDevice(ebr.Rule, ebr.Name, ebr.Attrs, ebr.Hod)
+}