logging: check for exact # of logs in tests

Change-Id: I780f3d2793660ad7c9753966e7067e50e9df44ad
Reviewed-on: https://code-review.googlesource.com/9031
Reviewed-by: Ross Light <light@google.com>
diff --git a/logging/logging_test.go b/logging/logging_test.go
index 7391559..bb4eb89 100644
--- a/logging/logging_test.go
+++ b/logging/logging_test.go
@@ -182,7 +182,7 @@
 			t.Log("fetching log entries: ", err)
 			return false
 		}
-		return len(got) >= len(want)
+		return len(got) == len(want)
 	})
 	if !ok {
 		t.Fatalf("timed out; got: %d, want: %d\n", len(got), len(want))
@@ -219,7 +219,7 @@
 			t.Log("fetching log entries: ", err)
 			return false
 		}
-		return len(got) >= len(want)
+		return len(got) == len(want)
 	})
 	if !ok {
 		t.Fatalf("timed out; got: %d, want: %d\n", len(got), len(want))
@@ -318,7 +318,7 @@
 			t.Log("fetching log entries: ", err)
 			return false
 		}
-		return len(got) >= 1
+		return len(got) == 1
 	})
 	if !ok {
 		t.Fatalf("timed out; got: %d, want: %d\n", len(got), 1)