test-results: Add revisions handler

go/src/infra/appengine/test-results/frontend/revision_test.go

Index: go/src/infra/appengine/test-results/frontend/revision_test.go
diff --git a/go/src/infra/appengine/test-results/frontend/revision_test.go b/go/src/infra/appengine/test-results/frontend/revision_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..a967624eecda254eee89356ae1b066396c843224
--- /dev/null
+++ b/go/src/infra/appengine/test-results/frontend/revision_test.go
@@ -0,0 +1,57 @@
+package frontend
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/luci/luci-go/server/router"
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestCommitPositionToHash(t *testing.T) {
+	t.Parallel()
+
+	data := map[string][]byte{
+		"1300": []byte(`{
+ "git_sha": "0dfc81bbe403cd98f4cd2d58e7817cdc8a881a5f",
+"repo": "chromium/src",
+"redirect_url": "https://chromium.googlesource.com/chromium/src/+/0dfc81bbe403cd98f4cd2d58e7817cdc8a881a5f",
+"project": "chromium",
+"redirect_type": "GIT_FROM_NUMBER",
+"repo_url": "https://chromium.googlesource.com/chromium/src/",
+"kind": "crrev#redirectItem",
+"etag": "\"kuKkspxlsT40mYsjSiqyueMe20E/qt8_sNqlQbK8xP9pkpc9EOsNyrE\""
+}`),
+	}
+	handler := func(c *router.Context) {
+		b, ok := data[c.Params.ByName("pos")]
+		if !ok {
+			http.Error(c.Writer, "not found", http.StatusNotFound)
+			return
+		}
+		c.Writer.Write(b)
+	}
+	r := router.New()
+	r.GET("/:pos", router.MiddlewareChain{}, handler)
+
+	srv := httptest.NewServer(r)
+
+	client := crRevClient{
+		HTTPClient: &http.Client{},
+		BaseURL:    srv.URL,
+	}
+
+	Convey("commitPositionToHash", t, func() {
+		Convey("existing position", func() {
+			hash, err := client.commitHash("1300")
+			So(err, ShouldBeNil)
+			So(hash, ShouldEqual, "0dfc81bbe403cd98f4cd2d58e7817cdc8a881a5f")
+		})
+
+		Convey("non-existent position", func() {
+			_, err := client.commitHash("0")
+			So(err, ShouldNotBeNil)
+		})
+	})
+}