Updated vignettes (programming strategy and unit test guide) to speci…

…fy library(tibble) and tribble() rather than tibble::tribble().

vignettes/programming_strategy.Rmd

@@ -296,8 +296,9 @@ An example is given below:
 #' @examples
 #' library(lubridate)
 #' library(dplyr)
+#' library(tibble)
 #'
-#' datain <- tibble::tribble(
+#' datain <- tribble(
 #'   ~TRTSDTM,             ~ASTDTM,               ~AENDT,
 #'  "2014-01-17T23:59:59", "2014-01-18T13:09:O9", "2014-01-20"
 #' ) %>%
@@ -329,7 +330,7 @@ Any newly added variable(-s) should be mentioned here.
 * `@examples`: A fully self-contained example of how to use the function. 
 Self-contained means that, if this code is executed in a new R session, it will run without errors. 
 That means any packages need to be loaded with `library()` and any datasets needed either to be created directly inside the example code or loaded using `data()`.
-If a dataset is created in the example, it should be done so using the function `tibble::tribble()`. 
+If a dataset is created in the example, it should be done so using the function `tribble()` (specify `library(tibble)` before calling this function).  
 Make sure to align columns as this ensures quick code readability. 
 
 Copying descriptions should be avoided as it makes the documentation hard to

vignettes/unit_test_guidance.Rmd

@@ -134,7 +134,9 @@ the testing framework used is testthat and has the following format :
 
 ```
 test_that("<function_name> Test 1: <Explanation of the test>", {
-  input <- tibble::tribble(
+  library(tibble)
+  
+  input <- tribble(
     ~inputvar1, ~inputvar2, ...
     <Add Test Data Scenarios>
     ...
@@ -158,7 +160,9 @@ Open the newly created file "test-all_funcs.R" and use the following format:
 
 ```
 test_that("my_new_func Test 1: <Explanation of the test>", {
-  input <- tibble::tribble(
+  library(tibble)
+  
+  input <- tribble(
     ~inputvar1, ~inputvar2, ...
     <Add Test Data Scenarios>
     ...
@@ -177,7 +181,7 @@ The input and expected output for the unit tests must follow the following rules
 * Values should be hard-coded whenever possible.
 * If values need to be derived, only unit tested functions can be used.
 
-If a dataset needs to be created for testing purpose, it should be done so using the function `tibble::tribble()`. 
+If a dataset needs to be created for testing purpose, it should be done so using the function `tribble()` (specify `library(tibble)` before calling this function). 
 Make sure to align columns as well. This ensures quick code readability.
 
 Ensure you give a meaningful explanation of the test in the testthat call, as