merge: Made all tests follow file strcture convention already in-place (#820)

* add empty line to end of file

* Move all test files to /test following convention

Recursive/test/FloodFill.test.js

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+import { breadthFirstSearch, depthFirstSearch } from '../FloodFill'
+
+// some constants
+const black = [0, 0, 0]
+const green = [0, 255, 0]
+const violet = [255, 0, 255]
+const white = [255, 255, 255]
+const orange = [255, 128, 0]
+
+describe('FloodFill', () => {
+  it('should calculate the correct colors using breadth-first approach', () => {
+    expect(testBreadthFirst([1, 1], green, orange, [1, 1])).toEqual(orange)
+    expect(testBreadthFirst([1, 1], green, orange, [0, 1])).toEqual(violet)
+    expect(testBreadthFirst([1, 1], green, orange, [6, 4])).toEqual(white)
+  })
+
+  it('should calculate the correct colors using depth-first approach', () => {
+    expect(testDepthFirst([1, 1], green, orange, [1, 1])).toEqual(orange)
+    expect(testDepthFirst([1, 1], green, orange, [0, 1])).toEqual(violet)
+    expect(testDepthFirst([1, 1], green, orange, [6, 4])).toEqual(white)
+  })
+})
+
+/**
+ * Utility-function to test the function "breadthFirstSearch".
+ *
+ * @param fillLocation The start location on the image where the flood fill is applied.
+ * @param targetColor The old color to be replaced.
+ * @param replacementColor The new color to replace the old one.
+ * @param testLocation The location of the color to be checked.
+ * @return The color at testLocation.
+ */
+function testBreadthFirst (fillLocation, targetColor, replacementColor, testLocation) {
+  const rgbData = generateTestRgbData()
+  breadthFirstSearch(rgbData, fillLocation, targetColor, replacementColor)
+  return rgbData[testLocation[0]][testLocation[1]]
+}
+
+/**
+ * Utility-function to test the function "depthFirstSearch".
+ *
+ * @param fillLocation The start location on the image where the flood fill is applied.
+ * @param targetColor The old color to be replaced.
+ * @param replacementColor The new color to replace the old one.
+ * @param testLocation The location of the color to be checked.
+ * @return The color at testLocation.
+ */
+function testDepthFirst (fillLocation, targetColor, replacementColor, testLocation) {// eslint-disable-line
+  const rgbData = generateTestRgbData()
+  depthFirstSearch(rgbData, fillLocation, targetColor, replacementColor)
+  return rgbData[testLocation[0]][testLocation[1]]
+}
+
+/**
+ * Generates the rgbData-matrix for the tests.
+ *
+ * @return example rgbData-matrix.
+ */
+function generateTestRgbData () {
+  const layout = [
+    [violet, violet, green, green, black, green, green],
+    [violet, green, green, black, green, green, green],
+    [green, green, green, black, green, green, green],
+    [black, black, green, black, white, white, green],
+    [violet, violet, black, violet, violet, white, white],
+    [green, green, green, violet, violet, violet, violet],
+    [violet, violet, violet, violet, violet, violet, violet]
+  ]
+
+  // transpose layout-matrix so the x-index comes before the y-index
+  const transposed = []
+  for (let x = 0; x < layout[0].length; x++) {
+    transposed[x] = []
+    for (let y = 0; y < layout.length; y++) {
+      transposed[x][y] = layout[y][x]
+    }
+  }
+
+  return transposed
+}

Recursive/test/KochSnowflake.test.js

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+import { iterate, Vector2 } from '../KochSnowflake'
+
+describe('KochSnowflake', () => {
+  it('should produce the correctly-transformed vectors', () => {
+    expect(iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[0])
+      .toEqual({ x: 0, y: 0 })
+
+    expect(iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[1])
+      .toEqual({ x: 1 / 3, y: 0 })
+
+    expect(iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[2])
+      .toEqual({ x: 1 / 2, y: Math.sin(Math.PI / 3) / 3 })
+
+    expect(iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[3])
+      .toEqual({ x: 2 / 3, y: 0 })
+
+    expect(iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[4])
+      .toEqual({ x: 1, y: 0 })
+  })
+})