diff --git a/github/admin_stats_test.go b/github/admin_stats_test.go
index 0d20b74cad8..dab2bc21fce 100644
--- a/github/admin_stats_test.go
+++ b/github/admin_stats_test.go
@@ -209,3 +209,311 @@ var testAdminStats = &AdminStats{
 		TotalPullRequestComments: Int(30),
 	},
 }
+
+func TestIssueStats_Marshal(t *testing.T) {
+	testJSONMarshal(t, &IssueStats{}, "{}")
+
+	u := &IssueStats{
+		TotalIssues:  Int(1),
+		OpenIssues:   Int(1),
+		ClosedIssues: Int(1),
+	}
+
+	want := `{
+		"total_issues": 1,
+		"open_issues": 1,
+		"closed_issues": 1
+	}`
+
+	testJSONMarshal(t, u, want)
+}
+
+func TestHookStats_Marshal(t *testing.T) {
+	testJSONMarshal(t, &HookStats{}, "{}")
+
+	u := &HookStats{
+		TotalHooks:    Int(1),
+		ActiveHooks:   Int(1),
+		InactiveHooks: Int(1),
+	}
+
+	want := `{
+		"total_hooks": 1,
+		"active_hooks": 1,
+		"inactive_hooks": 1
+	}`
+
+	testJSONMarshal(t, u, want)
+}
+
+func TestMilestoneStats_Marshal(t *testing.T) {
+	testJSONMarshal(t, &MilestoneStats{}, "{}")
+
+	u := &MilestoneStats{
+		TotalMilestones:  Int(1),
+		OpenMilestones:   Int(1),
+		ClosedMilestones: Int(1),
+	}
+
+	want := `{
+		"total_milestones": 1,
+		"open_milestones": 1,
+		"closed_milestones": 1
+	}`
+
+	testJSONMarshal(t, u, want)
+}
+
+func TestOrgStats_Marshal(t *testing.T) {
+	testJSONMarshal(t, &OrgStats{}, "{}")
+
+	u := &OrgStats{
+		TotalOrgs:        Int(1),
+		DisabledOrgs:     Int(1),
+		TotalTeams:       Int(1),
+		TotalTeamMembers: Int(1),
+	}
+
+	want := `{
+		"total_orgs": 1,
+		"disabled_orgs": 1,
+		"total_teams": 1,
+		"total_team_members": 1
+	}`
+
+	testJSONMarshal(t, u, want)
+}
+
+func TestCommentStats_Marshal(t *testing.T) {
+	testJSONMarshal(t, &CommentStats{}, "{}")
+
+	u := &CommentStats{
+		TotalCommitComments:      Int(1),
+		TotalGistComments:        Int(1),
+		TotalIssueComments:       Int(1),
+		TotalPullRequestComments: Int(1),
+	}
+
+	want := `{
+		"total_commit_comments": 1,
+		"total_gist_comments": 1,
+		"total_issue_comments": 1,
+		"total_pull_request_comments": 1
+	}`
+
+	testJSONMarshal(t, u, want)
+}
+
+func TestPageStats_Marshal(t *testing.T) {
+	testJSONMarshal(t, &PageStats{}, "{}")
+
+	u := &PageStats{
+		TotalPages: Int(1),
+	}
+
+	want := `{
+		"total_pages": 1
+	}`
+
+	testJSONMarshal(t, u, want)
+}
+
+func TestUserStats_Marshal(t *testing.T) {
+	testJSONMarshal(t, &UserStats{}, "{}")
+
+	u := &UserStats{
+		TotalUsers:     Int(1),
+		AdminUsers:     Int(1),
+		SuspendedUsers: Int(1),
+	}
+
+	want := `{
+		"total_users": 1,
+		"admin_users": 1,
+		"suspended_users": 1
+	}`
+
+	testJSONMarshal(t, u, want)
+}
+
+func TestGistStats_Marshal(t *testing.T) {
+	testJSONMarshal(t, &GistStats{}, "{}")
+
+	u := &GistStats{
+		TotalGists:   Int(1),
+		PrivateGists: Int(1),
+		PublicGists:  Int(1),
+	}
+
+	want := `{
+		"total_gists": 1,
+		"private_gists": 1,
+		"public_gists": 1
+	}`
+
+	testJSONMarshal(t, u, want)
+}
+
+func TestPullStats_Marshal(t *testing.T) {
+	testJSONMarshal(t, &PullStats{}, "{}")
+
+	u := &PullStats{
+		TotalPulls:      Int(1),
+		MergedPulls:     Int(1),
+		MergablePulls:   Int(1),
+		UnmergablePulls: Int(1),
+	}
+
+	want := `{
+		"total_pulls": 1,
+		"merged_pulls": 1,
+		"mergeable_pulls": 1,
+		"unmergeable_pulls": 1
+	}`
+
+	testJSONMarshal(t, u, want)
+}
+
+func TestRepoStats_Marshal(t *testing.T) {
+	testJSONMarshal(t, &RepoStats{}, "{}")
+
+	u := &RepoStats{
+		TotalRepos:  Int(1),
+		RootRepos:   Int(1),
+		ForkRepos:   Int(1),
+		OrgRepos:    Int(1),
+		TotalPushes: Int(1),
+		TotalWikis:  Int(1),
+	}
+
+	want := `{
+		"total_repos": 1,
+		"root_repos": 1,
+		"fork_repos": 1,
+		"org_repos": 1,
+		"total_pushes": 1,
+		"total_wikis": 1
+	}`
+
+	testJSONMarshal(t, u, want)
+}
+
+func TestAdminStats_Marshal(t *testing.T) {
+	testJSONMarshal(t, &AdminStats{}, "{}")
+
+	u := &AdminStats{
+		Repos: &RepoStats{
+			TotalRepos:  Int(212),
+			RootRepos:   Int(194),
+			ForkRepos:   Int(18),
+			OrgRepos:    Int(51),
+			TotalPushes: Int(3082),
+			TotalWikis:  Int(15),
+		},
+		Hooks: &HookStats{
+			TotalHooks:    Int(27),
+			ActiveHooks:   Int(23),
+			InactiveHooks: Int(4),
+		},
+		Pages: &PageStats{
+			TotalPages: Int(36),
+		},
+		Orgs: &OrgStats{
+			TotalOrgs:        Int(33),
+			DisabledOrgs:     Int(0),
+			TotalTeams:       Int(60),
+			TotalTeamMembers: Int(314),
+		},
+		Users: &UserStats{
+			TotalUsers:     Int(254),
+			AdminUsers:     Int(45),
+			SuspendedUsers: Int(21),
+		},
+		Pulls: &PullStats{
+			TotalPulls:      Int(86),
+			MergedPulls:     Int(60),
+			MergablePulls:   Int(21),
+			UnmergablePulls: Int(3),
+		},
+		Issues: &IssueStats{
+			TotalIssues:  Int(179),
+			OpenIssues:   Int(83),
+			ClosedIssues: Int(96),
+		},
+		Milestones: &MilestoneStats{
+			TotalMilestones:  Int(7),
+			OpenMilestones:   Int(6),
+			ClosedMilestones: Int(1),
+		},
+		Gists: &GistStats{
+			TotalGists:   Int(178),
+			PrivateGists: Int(151),
+			PublicGists:  Int(25),
+		},
+		Comments: &CommentStats{
+			TotalCommitComments:      Int(6),
+			TotalGistComments:        Int(28),
+			TotalIssueComments:       Int(366),
+			TotalPullRequestComments: Int(30),
+		},
+	}
+
+	want := `{
+		"repos": {
+			"total_repos": 212,
+			"root_repos": 194,
+			"fork_repos": 18,
+			"org_repos": 51,
+			"total_pushes": 3082,
+			"total_wikis": 15
+		},
+		"hooks": {
+			"total_hooks": 27,
+			"active_hooks": 23,
+			"inactive_hooks": 4
+		},
+		"pages": {
+			"total_pages": 36
+		},
+		"orgs": {
+			"total_orgs": 33,
+			"disabled_orgs": 0,
+			"total_teams": 60,
+			"total_team_members": 314
+		},
+		"users": {
+			"total_users": 254,
+			"admin_users": 45,
+			"suspended_users": 21
+		},
+		"pulls": {
+			"total_pulls": 86,
+			"merged_pulls": 60,
+			"mergeable_pulls": 21,
+			"unmergeable_pulls": 3
+		},
+		"issues": {
+			"total_issues": 179,
+			"open_issues": 83,
+			"closed_issues": 96
+		},
+		"milestones": {
+			"total_milestones": 7,
+			"open_milestones": 6,
+			"closed_milestones": 1
+		},
+		"gists": {
+			"total_gists": 178,
+			"private_gists": 151,
+			"public_gists": 25
+		},
+		"comments": {
+			"total_commit_comments": 6,
+			"total_gist_comments": 28,
+			"total_issue_comments": 366,
+			"total_pull_request_comments": 30
+		}
+	}`
+
+	testJSONMarshal(t, u, want)
+}