tests/thirdparty: add klauspost/compress/s2 (#131)

Adds @klauspost's S2 implementation to the third party test suite.

The full klauspost/compress tests are slow but we only care about the S2 sub-package. Therefore this PR also adds the option to only run a subset of the package tests, controlled by a "test" parameter in the JSON configuration.

Closes #130

tests/thirdparty/config.go

@@ -14,6 +14,7 @@ type Package struct {
 	Version    string     `json:"version"`     // git sha, tag or branch
 	Generate   [][]string `json:"generate"`    // generate commands to run
 	Dir        string     `json:"dir"`         // working directory for generate commands
+	Test       string     `json:"test"`        // test path relative to repo root (if empty defaults to ./...)
 }
 
 // Name returns the package name.
@@ -26,6 +27,14 @@ func (p Package) CloneURL() string {
 	return "https://" + p.ImportPath + ".git"
 }
 
+// TestPath returns the paths to run "go test" on, relative to the repository root.
+func (p Package) TestPath() string {
+	if p.Test == "" {
+		return "./..."
+	}
+	return p.Test
+}
+
 // LoadPackages loads a list of package configurations from JSON format.
 func LoadPackages(r io.Reader) ([]Package, error) {
 	var pkgs []Package

tests/thirdparty/config_test.go

@@ -19,6 +19,18 @@ func TestPackageCloneURL(t *testing.T) {
 	}
 }
 
+func TestPackagesTestPath(t *testing.T) {
+	p := Package{}
+	if p.TestPath() != "./..." {
+		t.Fail()
+	}
+
+	p.Test = "./sub"
+	if p.TestPath() != "./sub" {
+		t.Fail()
+	}
+}
+
 func TestLoadPackages(t *testing.T) {
 	r := strings.NewReader(`[{"unknown_field": "value"}]`)
 	_, err := LoadPackages(r)

tests/thirdparty/packages.json

@@ -130,5 +130,22 @@
                 "primitivefuncs_amd64.s"
             ]
         ]
+    },
+    {
+        "import_path": "github.com/klauspost/compress",
+        "version": "23a5980ed240fd76b89481403c834f48943b3788",
+        "dir": "s2",
+        "generate": [
+            [
+                "go",
+                "run",
+                "gen.go",
+                "-out",
+                "encodeblock_amd64.s",
+                "-stubs",
+                "encodeblock_amd64.go"
+            ]
+        ],
+        "test": "./s2"
     }
 ]

tests/thirdparty/packages_test.go

@@ -145,7 +145,7 @@ func (t *PackageTest) diff() {
 
 // test runs go test.
 func (t *PackageTest) test() {
-	t.gotool("test", "./...")
+	t.gotool("test", t.TestPath())
 }
 
 // git runs a git command.