From 02a92c33ab71e3d2e0bf28ffcffb1477d4a367d4 Mon Sep 17 00:00:00 2001
From: Daniel Chudnov <dlchudnov@mitre.org>
Date: Thu, 10 Jun 2021 14:35:01 -0400
Subject: [PATCH] added "valid, but empty input" test, fix, refs
 https://github.com/carriedaymont/growthcleanr/issues/49

---
 R/growth.R                        | 36 +++++++++++++++++--------------
 tests/testthat/test-cleangrowth.R | 12 +++++++++++
 2 files changed, 32 insertions(+), 16 deletions(-)

diff --git a/R/growth.R b/R/growth.R
index d3c5942d..f10227b9 100644
--- a/R/growth.R
+++ b/R/growth.R
@@ -564,12 +564,12 @@ cleangrowth <- function(subjid,
 
   # adult: send to cleanadult to do most of the work ----
 
-  if (!quietly){
-    cat(sprintf("[%s] Begin processing adult data...\n", Sys.time()))
-  }
-
   # no need to do this if there's no data
   if (nrow(data.adult) > 0){
+    if (!quietly){
+      cat(sprintf("[%s] Begin processing adult data...\n", Sys.time()))
+    }
+
     # TODO: MAKE THIS BETTER -- FUNCTION OR SOMETHING
     # TODO: BATCH LOGS??
     # if parallel processing is desired, load additional modules
@@ -659,19 +659,23 @@ cleangrowth <- function(subjid,
   }
 
 
-  # join with pediatric data
-  full_out <- data.table(
-    line = c(ret.df$line, res$line),
-    exclude = c(as.character(ret.df$exclude), res$result),
-    mean_sde = c(rep(NA, nrow(ret.df)), res$mean_sde)
-  )
-  full_out[, exclude := factor(exclude, levels = unique(c(exclude.levels,
-                                                   unique(exclude))))]
-  full_out <- full_out[order(line),]
-  # remove column added for keeping track
-  full_out[, line := NULL]
+  if (any(nrow(data.all) > 0, nrow(data.adult) > 0)) {
+    # join with pediatric data
+    full_out <- data.table(
+      line = c(ret.df$line, res$line),
+      exclude = c(as.character(ret.df$exclude), res$result),
+      mean_sde = c(rep(NA, nrow(ret.df)), res$mean_sde)
+    )
+    full_out[, exclude := factor(exclude, levels = unique(c(exclude.levels,
+                                                    unique(exclude))))]
+    full_out <- full_out[order(line),]
+    # remove column added for keeping track
+    full_out[, line := NULL]
 
-  return(full_out$exclude)
+    return(full_out$exclude)
+  } else {
+    return(c())
+  }
 
 }
 
diff --git a/tests/testthat/test-cleangrowth.R b/tests/testthat/test-cleangrowth.R
index b3fa3588..4b89e5f4 100644
--- a/tests/testthat/test-cleangrowth.R
+++ b/tests/testthat/test-cleangrowth.R
@@ -94,6 +94,7 @@ test_that("growthcleanr works without either adult or pediatric data", {
   # using default cutpoint -- 20
   only_peds <- syngrowth[syngrowth$agedays < 20*365.25,][1:50,]
   only_adult <- syngrowth[syngrowth$agedays >= 20*365.25,][1:50,]
+  nobody <- syngrowth[syngrowth$agedays > 120*365.25,]
 
   # testing cleangrowth works without adult data
   peds_res <- cleangrowth(
@@ -119,4 +120,15 @@ test_that("growthcleanr works without either adult or pediatric data", {
 
   expect_equal(length(adult_res), nrow(only_adult))
 
+  # testing cleangrowth works with no data
+  no_res <- cleangrowth(
+    nobody$subjid,
+    nobody$param,
+    nobody$agedays,
+    nobody$sex,
+    nobody$measurement,
+    quietly = T
+  )
+
+  expect_equal(length(no_res), nrow(nobody))
 })
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