packer_test: add convenience func for invert grep

As inverted grep is something we do rather often, we add a convenience
function to create an inverted grep gadget.

packer_test/core_tests/local_eval_test.go

@@ -17,7 +17,7 @@ func (ts *PackerCoreTestSuite) TestEvalLocalsOrder() {
 		Stdin("local.test_local\n").
 		SetArgs("console", "./templates/locals_no_order.pkr.hcl").
 		Assert(lib.MustSucceed(),
-			lib.Grep("\\[\\]", lib.GrepStdout, lib.GrepInvert))
+			lib.GrepInverted("\\[\\]", lib.GrepStdout))
 }
 
 func (ts *PackerCoreTestSuite) TestLocalDuplicates() {

packer_test/lib/gadgets.go

@@ -125,6 +125,10 @@ func Grep(expression string, opts ...GrepOpts) Checker {
 	return pc
 }
 
+func GrepInverted(expression string, opts ...GrepOpts) Checker {
+	return Grep(expression, append(opts, GrepInvert)...)
+}
+
 type PluginVersionTuple struct {
 	Source  string
 	Version *version.Version

packer_test/plugin_tests/install_test.go

@@ -52,7 +52,7 @@ func (ts *PackerPluginTestSuite) TestInstallPluginWithPath() {
 			SetArgs("plugins", "installed").
 			Assert(lib.MustSucceed(),
 				lib.Grep("plugin-tester_v1.0.0-dev[^+]", lib.GrepStdout),
-				lib.Grep("plugin-tester_v1.0.0-dev\\+", lib.GrepStdout, lib.GrepInvert),
+				lib.GrepInverted("plugin-tester_v1.0.0-dev\\+", lib.GrepStdout),
 				lib.LineCountCheck(1))
 	})
 }

packer_test/plugin_tests/loading_test.go

@@ -110,7 +110,7 @@ func (ts *PackerPluginTestSuite) TestLoadWithSHAMismatches() {
 			SetArgs("plugins", "installed").
 			Assert(lib.MustSucceed(),
 				lib.Grep("packer-plugin-tester_v1\\.0\\.9[^\\n]+", lib.GrepStdout),
-				lib.Grep("packer-plugin-tester_v1.0.10", lib.GrepStdout, lib.GrepInvert),
+				lib.GrepInverted("packer-plugin-tester_v1.0.10", lib.GrepStdout),
 				lib.Grep("v1.0.10[^\\n]+ignoring possibly unsafe binary", lib.GrepStderr))
 	})
 
@@ -128,7 +128,7 @@ func (ts *PackerPluginTestSuite) TestLoadWithSHAMismatches() {
 			SetArgs("plugins", "installed").
 			Assert(lib.MustSucceed(),
 				lib.Grep("packer-plugin-tester_v1\\.0\\.9[^\\n]+", lib.GrepStdout),
-				lib.Grep("packer-plugin-tester_v1.0.10", lib.GrepInvert, lib.GrepStdout),
+				lib.GrepInverted("packer-plugin-tester_v1.0.10", lib.GrepStdout),
 				lib.Grep("v1.0.10[^\\n]+ignoring possibly unsafe binary", lib.GrepStderr),
 				lib.Grep(`Checksums \(\*sha256\.digest\) did not match.`, lib.GrepStderr))
 	})

packer_test/plugin_tests/plugins_remove_test.go

@@ -72,7 +72,7 @@ func (ts *PackerPluginTestSuite) TestPluginsRemoveWithSourceAddressAndVersion()
 				lib.MustSucceed(),
 				lib.Grep("packer-plugin-tester_v1.0.9", lib.GrepStdout),
 				lib.Grep("packer-plugin-tester_v1.0.10", lib.GrepStdout),
-				lib.Grep("packer-plugin-tester_v2.0.0", lib.GrepInvert, lib.GrepStdout),
+				lib.GrepInverted("packer-plugin-tester_v2.0.0", lib.GrepStdout),
 			)
 	})
 
@@ -98,7 +98,7 @@ func (ts *PackerPluginTestSuite) TestPluginsRemoveWithLocalPath() {
 			Assert(
 				lib.MustSucceed(),
 				lib.Grep("packer-plugin-tester_v1.0.9", lib.GrepStdout),
-				lib.Grep("packer-plugin-tester_v1.0.10", lib.GrepInvert, lib.GrepStdout),
+				lib.GrepInverted("packer-plugin-tester_v1.0.10", lib.GrepStdout),
 			)
 	})
 	ts.Run("plugins installed after calling plugins remove outputs remaining installed plugins", func() {
@@ -107,7 +107,7 @@ func (ts *PackerPluginTestSuite) TestPluginsRemoveWithLocalPath() {
 			Assert(
 				lib.MustSucceed(),
 				lib.Grep("packer-plugin-tester_v1.0.10", lib.GrepStdout),
-				lib.Grep("packer-plugin-tester_v1.0.9", lib.GrepInvert, lib.GrepStdout),
+				lib.GrepInverted("packer-plugin-tester_v1.0.9", lib.GrepStdout),
 			)
 	})