diff --git a/go/chromite/api/test.pb.go b/go/chromite/api/test.pb.go
index 755a137..884b755 100644
--- a/go/chromite/api/test.pb.go
+++ b/go/chromite/api/test.pb.go
@@ -67,7 +67,10 @@
 	// The flags.
 	Flags *BuildTargetUnitTestRequest_Flags `protobuf:"bytes,4,opt,name=flags,proto3" json:"flags,omitempty"`
 	// Skipped packages.
-	PackageBlacklist     []*chromiumos.PackageInfo `protobuf:"bytes,5,rep,name=package_blacklist,json=packageBlacklist,proto3" json:"package_blacklist,omitempty"`
+	PackageBlacklist []*chromiumos.PackageInfo `protobuf:"bytes,5,rep,name=package_blacklist,json=packageBlacklist,proto3" json:"package_blacklist,omitempty"`
+	// Packages to be tested.
+	// Defaults to all testable packages when none are given.
+	Packages             []*chromiumos.PackageInfo `protobuf:"bytes,6,rep,name=packages,proto3" json:"packages,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                  `json:"-"`
 	XXX_unrecognized     []byte                    `json:"-"`
 	XXX_sizecache        int32                     `json:"-"`
@@ -133,6 +136,13 @@
 	return nil
 }
 
+func (m *BuildTargetUnitTestRequest) GetPackages() []*chromiumos.PackageInfo {
+	if m != nil {
+		return m.Packages
+	}
+	return nil
+}
+
 type BuildTargetUnitTestRequest_Flags struct {
 	// Assume the sysroot is empty.
 	EmptySysroot bool `protobuf:"varint,1,opt,name=empty_sysroot,json=emptySysroot,proto3" json:"empty_sysroot,omitempty"`
@@ -993,75 +1003,75 @@
 func init() { proto.RegisterFile("chromite/api/test.proto", fileDescriptor_f5c91b4ac6233d9e) }
 
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+	0x80, 0x3e, 0x83, 0xda, 0x30, 0x72, 0x33, 0xc9, 0x78, 0x60, 0x58, 0x8b, 0x78, 0xd4, 0x69, 0x65,
+	0x28, 0xfe, 0x32, 0xf3, 0x47, 0x80, 0xa9, 0x93, 0xe8, 0x29, 0xe8, 0x49, 0x1a, 0x0c, 0x31, 0x27,
+	0xee, 0x29, 0x19, 0x4d, 0x3b, 0x7a, 0x5e, 0x56, 0x1a, 0x0a, 0xf9, 0x15, 0x19, 0x89, 0xec, 0x20,
+	0xa8, 0x24, 0x34, 0x95, 0x29, 0x5f, 0x76, 0xc4, 0xb7, 0x69, 0x41, 0x55, 0x5e, 0x88, 0x0c, 0x58,
+	0x49, 0x30, 0xe7, 0x24, 0x8d, 0xd5, 0x88, 0x18, 0x1f, 0xad, 0x27, 0xa0, 0xe5, 0x82, 0x43, 0x37,
+	0x41, 0x3b, 0x7e, 0xd5, 0x69, 0x1f, 0xb6, 0x8e, 0x9e, 0x1f, 0x1d, 0x1e, 0xe8, 0xef, 0xa1, 0x1a,
+	0x54, 0xba, 0xcf, 0x3a, 0x5d, 0xbd, 0x84, 0xea, 0x50, 0x7b, 0x76, 0xdc, 0x7d, 0xdd, 0x3d, 0xec,
+	0x74, 0xf5, 0xb2, 0xa5, 0x43, 0x63, 0x1c, 0x9a, 0x2a, 0xa2, 0xdf, 0xcb, 0x70, 0xfb, 0x25, 0xed,
+	0x85, 0xb8, 0x57, 0x2c, 0xa5, 0x6b, 0x74, 0x0c, 0x7a, 0x05, 0xab, 0x41, 0x94, 0xcd, 0xf0, 0x04,
+	0x8f, 0x42, 0x8a, 0x4f, 0x54, 0x05, 0xed, 0x16, 0x73, 0x3a, 0xe7, 0x16, 0xbb, 0x2d, 0x0d, 0x9c,
+	0xba, 0xb0, 0x57, 0x27, 0xd4, 0x86, 0x86, 0x87, 0xbd, 0xc1, 0x84, 0x6f, 0x3c, 0xc2, 0xae, 0x41,
+	0xb8, 0x2a, 0x08, 0xd4, 0x89, 0x99, 0x4d, 0x58, 0x19, 0x93, 0x3f, 0x80, 0xca, 0xc2, 0x27, 0x12,
+	0x5a, 0x6b, 0x1d, 0xee, 0x14, 0xe9, 0x55, 0xba, 0xfe, 0x28, 0xc1, 0x66, 0x27, 0x88, 0x92, 0x90,
+	0x88, 0x19, 0x44, 0xbe, 0xa1, 0xe9, 0x69, 0x3f, 0xa4, 0xbf, 0xfe, 0xa7, 0x69, 0xb0, 0x09, 0x9a,
+	0x00, 0x10, 0x77, 0xd2, 0x7f, 0x37, 0x1c, 0x90, 0x22, 0x27, 0x03, 0x7c, 0x02, 0x9a, 0x4f, 0x23,
+	0xec, 0x7a, 0x34, 0xee, 0x07, 0xbe, 0xea, 0xb9, 0xf5, 0xbc, 0xeb, 0x2f, 0x68, 0x84, 0x5b, 0x42,
+	0xeb, 0x80, 0x3f, 0xf9, 0xb6, 0x2c, 0xd8, 0xba, 0xd8, 0x5b, 0x19, 0xd2, 0xde, 0x5f, 0x55, 0x59,
+	0x4c, 0x1d, 0x92, 0x0e, 0x03, 0x8f, 0xa0, 0x14, 0x6e, 0xcf, 0x59, 0x5e, 0x68, 0xe7, 0xaa, 0x1b,
+	0xde, 0xdc, 0xbd, 0x02, 0x52, 0xa5, 0xb3, 0xfa, 0xe6, 0xad, 0x59, 0xd6, 0xcb, 0x08, 0x83, 0x3e,
+	0xbb, 0x34, 0xd0, 0xc3, 0x22, 0xcd, 0x05, 0xbb, 0xc9, 0x7c, 0x74, 0x19, 0x4c, 0x2d, 0xdd, 0x1f,
+	0xa0, 0x51, 0x5c, 0x1b, 0x68, 0x7b, 0xbe, 0x65, 0x61, 0x33, 0x99, 0x0f, 0x16, 0x83, 0x14, 0xf9,
+	0xcf, 0x70, 0x73, 0x66, 0x67, 0xa0, 0x59, 0xc3, 0xb9, 0x8b, 0xc9, 0x7c, 0x78, 0x09, 0x4a, 0xf1,
+	0x7f, 0x0b, 0xab, 0x85, 0x1d, 0x80, 0x66, 0xe6, 0xd5, 0xbc, 0xad, 0x64, 0x6e, 0x2f, 0xc4, 0x28,
+	0xe6, 0xd6, 0x64, 0xda, 0xdc, 0x5d, 0x30, 0x02, 0xcd, 0x7b, 0xf3, 0x95, 0x8a, 0xe4, 0x27, 0xa8,
+	0xe7, 0xbb, 0x05, 0xdd, 0xbf, 0xb4, 0x51, 0x4d, 0x6b, 0x11, 0x64, 0xa6, 0x3a, 0x7e, 0x2b, 0x81,
+	0x71, 0x51, 0x19, 0xa3, 0x8f, 0x67, 0x9a, 0x6b, 0x71, 0x73, 0x9a, 0xf6, 0x55, 0xe1, 0x45, 0x1f,
+	0xcc, 0xfa, 0x9b, 0xb7, 0x66, 0x0d, 0x2a, 0xd9, 0xab, 0xeb, 0xa5, 0xfd, 0x4f, 0xbf, 0x7f, 0xe2,
+	0xd3, 0x49, 0xff, 0xd9, 0x34, 0xf5, 0x9b, 0xb9, 0x5f, 0xf4, 0x41, 0xdc, 0x4f, 0x71, 0x53, 0xfc,
+	0x9e, 0x6f, 0xfa, 0xb4, 0x99, 0xff, 0x07, 0xa1, 0x57, 0x15, 0xe2, 0xc7, 0xff, 0x06, 0x00, 0x00,
+	0xff, 0xff, 0xb9, 0x6f, 0xbf, 0xf7, 0x7c, 0x0c, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/src/chromite/api/test.proto b/src/chromite/api/test.proto
index ac8e491..40a3fcc 100644
--- a/src/chromite/api/test.proto
+++ b/src/chromite/api/test.proto
@@ -28,6 +28,9 @@
   Flags flags = 4;
   // Skipped packages.
   repeated chromiumos.PackageInfo package_blacklist = 5;
+  // Packages to be tested.
+  // Defaults to all testable packages when none are given.
+  repeated chromiumos.PackageInfo packages = 6;
 }
 
 message BuildTargetUnitTestResponse {