test(isValid2DBoundingBox): add robust snapshot tests

Adds extensive snapshot testing to address #32.

tests/boundingBoxes/__snapshots__/isValid2DBoundingBox.test.js.snap

@@ -1,18 +1,66 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Error Snapshot Testing. Throws error: expect([10, 10, 20, 20]).not.isValid2DBoundingBox 1`] = `
-"[2mexpect([22m[31m[east, south, west, north][39m[2m).not.isValid2DBoundingBox()[22m
+exports[`Error Snapshot Testing. Throws error: Bounding box eastern value must be a number between -180 and 180 1`] = `
+"[2mexpect([22m[31m[east, south, west, north][39m[2m).isValid2DBoundingBox()[22m
 
-Expected input to not be a four element array of numbers with longitude between (-90 to 90),
-        latitude between (-180 to 180), and northern boundary greater than southern boundary.
+Bounding box western value must be a number between -180 and 180.
 
-Received:  [31m[10, 10, 20, 20][39m"
+Received:  [31m[10, 10, 200, 20][39m"
 `;
 
-exports[`Error Snapshot Testing. Throws error: expect(false).isValid2DBoundingBox() 1`] = `
+exports[`Error Snapshot Testing. Throws error: Bounding box must be an array of only four elments 1`] = `
+"expect([east, south, west, north]).isValid2DBoundingBox()
+
+Bounding box must be an array of only four elments.
+
+Received:  [10, 10, 20, 20, 30]"
+`;
+
+exports[`Error Snapshot Testing. Throws error: Bounding box northern value must be a number between -90 and 90 1`] = `
+"expect([east, south, west, north]).isValid2DBoundingBox()
+
+Bounding box northern value must be a number between -90 and 90.
+
+Received:  [10, 10, 20, 200]"
+`;
+
+exports[`Error Snapshot Testing. Throws error: Bounding box northern value must be greater than southern 1`] = `
+"expect([east, south, west, north]).isValid2DBoundingBox()
+
+Bounding box northern value must be greater than southern.
+
+Received:  [10, 20, 20, 0]"
+`;
+
+exports[`Error Snapshot Testing. Throws error: Bounding box southern value must be a number between -90 and 90 1`] = `
+"expect([east, south, west, north]).isValid2DBoundingBox()
+
+Bounding box southern value must be a number between -90 and 90.
+
+Received:  [10, -200, 20, 20]"
+`;
+
+exports[`Error Snapshot Testing. Throws error: Bounding box western value must be a number between -180 and 180 1`] = `
+"expect([east, south, west, north]).isValid2DBoundingBox()
+
+Bounding box eastern value must be a number between -180 and 180.
+
+Received:  [200, 10, 20, 20]"
+`;
+
+exports[`Error Snapshot Testing. Throws error: Invalid input to matcher 1`] = `
 "expect([east, south, west, north]).isValid2DBoundingBox()
 
 Bounding box must be an array of only four elments.
 
 Received:  false"
 `;
+
+exports[`Error Snapshot Testing. Throws error: Valid use case passes 1`] = `
+"expect([east, south, west, north]).not.isValid2DBoundingBox()
+
+Expected input to not be a four element array of numbers with longitude between (-90 to 90),
+        latitude between (-180 to 180), and northern boundary greater than southern boundary.
+
+Received:  [10, 10, 20, 20]"
+`;

tests/boundingBoxes/isValid2DBoundingBox.test.js

@@ -154,13 +154,47 @@ describe('Inalid Use Cases', () => {
 })
 
 describe('Error Snapshot Testing. Throws error:', () => {
-    test('expect([10, 10, 20, 20]).not.isValid2DBoundingBox', () => {
+    test('Valid use case passes', () => {
         expect(() =>
             expect([10, 10, 20, 20]).not.isValid2DBoundingBox()
         ).toThrowErrorMatchingSnapshot()
     })
 
-    test('expect(false).isValid2DBoundingBox()', () => {
+    test('Invalid input to matcher', () => {
         expect(() => expect(false).isValid2DBoundingBox()).toThrowErrorMatchingSnapshot()
     })
+
+    test('Bounding box must be an array of only four elments', () => {
+        expect(() =>
+            expect([10, 10, 20, 20, 30]).isValid2DBoundingBox()
+        ).toThrowErrorMatchingSnapshot()
+    })
+
+    test('Bounding box eastern value must be a number between -180 and 180', () => {
+        expect(() =>
+            expect([10, 10, 200, 20]).isValid2DBoundingBox()
+        ).toThrowErrorMatchingSnapshot()
+    })
+
+    test('Bounding box western value must be a number between -180 and 180', () => {
+        expect(() =>
+            expect([200, 10, 20, 20]).isValid2DBoundingBox()
+        ).toThrowErrorMatchingSnapshot()
+    })
+
+    test('Bounding box southern value must be a number between -90 and 90', () => {
+        expect(() =>
+            expect([10, -200, 20, 20]).isValid2DBoundingBox()
+        ).toThrowErrorMatchingSnapshot()
+    })
+
+    test('Bounding box northern value must be a number between -90 and 90', () => {
+        expect(() =>
+            expect([10, 10, 20, 200]).isValid2DBoundingBox()
+        ).toThrowErrorMatchingSnapshot()
+    })
+
+    test('Bounding box northern value must be greater than southern', () => {
+        expect(() => expect([10, 20, 20, 0]).isValid2DBoundingBox()).toThrowErrorMatchingSnapshot()
+    })
 })