Adding no checks message when PR has no checks

Including additional tests.

pkg/cmd/pr/shared/display.go

@@ -75,17 +75,19 @@ func ListHeader(repoName string, itemName string, matchCount int, totalMatchCoun
 }
 
 func PrCheckStatusSummaryWithColor(cs *iostreams.ColorScheme, checks api.PullRequestChecksStatus) string {
-	var summary string
-	if checks.Failing > 0 {
-		if checks.Failing == checks.Total {
-			summary = cs.Red("× All checks failing")
-		} else {
-			summary = cs.Redf("× %d/%d checks failing", checks.Failing, checks.Total)
+	var summary = cs.Gray("No checks")
+	if checks.Total > 0 {
+		if checks.Failing > 0 {
+			if checks.Failing == checks.Total {
+				summary = cs.Red("× All checks failing")
+			} else {
+				summary = cs.Redf("× %d/%d checks failing", checks.Failing, checks.Total)
+			}
+		} else if checks.Pending > 0 {
+			summary = cs.Yellow("- Checks pending")
+		} else if checks.Passing == checks.Total {
+			summary = cs.Green("✓ Checks passing")
 		}
-	} else if checks.Pending > 0 {
-		summary = cs.Yellow("- Checks pending")
-	} else if checks.Passing == checks.Total {
-		summary = cs.Green("✓ Checks passing")
 	}
 	return summary
 }

pkg/cmd/pr/shared/display_test.go

@@ -103,6 +103,16 @@ func TestPrCheckStatusSummaryWithColor(t *testing.T) {
 		args api.PullRequestChecksStatus
 		want string
 	}{
+		{
+			Name: "No Checks",
+			args: api.PullRequestChecksStatus{
+				Total:   0,
+				Failing: 0,
+				Passing: 0,
+				Pending: 0,
+			},
+			want: "No checks",
+		},
 		{
 			Name: "All Passing",
 			args: api.PullRequestChecksStatus{

pkg/cmd/pr/view/fixtures/prViewPreviewWithNoChecks.json

@@ -0,0 +1,58 @@
+{
+  "data": {
+    "repository": {
+      "pullRequest": {
+        "number": 12,
+        "title": "Blueberries are from a fork",
+        "state": "OPEN",
+        "body": "**blueberries taste good**",
+        "url": "https://github.com/OWNER/REPO/pull/12",
+        "author": {
+          "login": "nobody"
+        },
+        "additions": 100,
+        "deletions": 10,
+        "assignees": {
+          "nodes": [],
+          "totalcount": 0
+        },
+        "labels": {
+          "nodes": [],
+          "totalcount": 0
+        },
+        "projectcards": {
+          "nodes": [],
+          "totalcount": 0
+        },
+        "milestone": {
+          "title": ""
+        },
+        "commits": {
+          "totalCount": 12
+        },
+        "baseRefName": "master",
+        "headRefName": "blueberries",
+        "headRepositoryOwner": {
+          "login": "hubot"
+        },
+        "isCrossRepository": true,
+        "isDraft": false,
+        "statusCheckRollup": {
+          "nodes": [
+            {
+              "commit": {
+                "oid": "abc",
+                "statusCheckRollup": {
+                  "contexts": {
+                    "nodes": [
+                    ]
+                  }
+                }
+              }
+            }
+          ]
+        }
+      }
+    }
+  }
+}

pkg/cmd/pr/view/view_test.go

@@ -490,6 +490,20 @@ func TestPRView_Preview(t *testing.T) {
 				`View this pull request on GitHub: https://github.com/OWNER/REPO/pull/12`,
 			},
 		},
+		"Open PR with no checks": {
+			branch: "master",
+			args:   "12",
+			fixtures: map[string]string{
+				"PullRequestByNumber": "./fixtures/prViewPreviewWithNoChecks.json",
+			},
+			expectedOutputs: []string{
+				`Blueberries are from a fork #12`,
+				`Open.*nobody wants to merge 12 commits into master from blueberries . about X years ago`,
+				`.+100.-10 • No checks`,
+				`blueberries taste good`,
+				`View this pull request on GitHub: https://github.com/OWNER/REPO/pull/12`,
+			},
+		},
 	}
 
 	for name, tc := range tests {