Added test to showcase the functionality.

tests/testthat/GeomLinerangeBC_pars

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+list(na.rm = TRUE, flipped_aes = FALSE, na.rm = TRUE, fill_up = "darkblue", 
+    fill_down = "red", colour_up = "darkblue", colour_down = "red", 
+    position = "identity", hoverTextAes = list(x = "date", y = "close", 
+        open = "open", close = "close", high = "high", low = "low"))

tests/testthat/GeomRectCS_pars

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+list(na.rm = TRUE, na.rm = TRUE, fill_up = "darkblue", fill_down = "red", 
+    colour_up = "darkblue", colour_down = "red", position = "identity", 
+    hoverTextAes = list(x = "date", y = "close", open = "open", 
+        close = "close", high = "high", low = "low"))

tests/testthat/test-geom-candlestick.R

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+if(require(tidyquant)){
+  df <- data.frame(symbol = c("AMZN", "AMZN", "AMZN", "AMZN", "AMZN", 
+    "AMZN", "AMZN", "AMZN", "AMZN", "AMZN", "AMZN", "AMZN", "AMZN", 
+    "AMZN", "AMZN", "AMZN", "AMZN", "AMZN", "AMZN"), date = structure(c(17140, 
+    17141, 17142, 17143, 17144, 17147, 17148, 17149, 17150, 17151, 
+    17154, 17155, 17156, 17157, 17158, 17162, 17163, 17164, 17165
+    ), class = "Date"), open = c(745, 763.98999, 764.549988, 771.869995, 
+    770, 766.400024, 764.960022, 778.25, 766.280029, 765, 758.890015, 
+    768.650024, 770, 768.119995, 764.549988, 763.400024, 776.25, 
+    772.400024, 766.469971), high = c(761.48999, 768.23999, 770.419983, 
+    773.789978, 770.25, 766.890015, 782.460022, 780.859985, 769.099976, 
+    765.130005, 770.5, 774.390015, 771.219971, 771.210022, 766.5, 
+    774.650024, 780, 773.400024, 767.400024), low = c(742, 757.25, 
+    755.820007, 765.190002, 765.340027, 757.200012, 762, 762.809998, 
+    760.309998, 754, 756.159973, 767.710022, 765.700012, 763.02002, 
+    757.98999, 761.200012, 770.5, 760.849976, 748.280029), close = c(759.359985, 
+    764.719971, 770.419983, 767.330017, 768.659973, 760.119995, 774.340027, 
+    768.820007, 761, 757.77002, 766, 771.219971, 770.599976, 766.340027, 
+    760.590027, 771.400024, 772.130005, 765.150024, 749.869995), 
+    volume = c(4314700, 3794700, 3684900, 3189600, 2470900, 2963900, 
+    5285300, 5454800, 3801900, 4848200, 3113200, 2703600, 2044600, 
+    2543600, 1981600, 2638700, 3301000, 3158300, 4139400), adjusted = c(759.359985, 
+    764.719971, 770.419983, 767.330017, 768.659973, 760.119995, 
+    774.340027, 768.820007, 761, 757.77002, 766, 771.219971, 
+    770.599976, 766.340027, 760.590027, 771.400024, 772.130005, 
+    765.150024, 749.869995), stringsAsFactors = F)
+
+  test_that("candlestick gets rendered correctly", {
+    p <- AMZN %>%
+           ggplot(aes(x = date, y = close)) +
+           geom_candlestick(aes(open = open, close = close, high = high, low = low)) + 
+           labs(title = "AMZN: New Candlestick Geom!",
+                x = "", y = "Closing Price") +
+           coord_x_date(ylim = c(700, 870))
+    expect_doppelganger(ggplotly(p), "geom-candle")
+  })       
+}