test(isValid3DCoordinate): add robust snapshot tests

Adds extensive snapshot testing to address #32.

tests/coordinates/__snapshots__/isValid3DCoordinate.test.js.snap

@@ -1,18 +1,34 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Error Snapshot Testing. Throws error: expect([0, 0, 0]).not.isValid3DCoordinate 1`] = `
-"[2mexpect([22m[31m[longitude, latitude, altitude][39m[2m).not.isValid3DCoordinate()[22m
+exports[`Error Snapshot Testing. Throws error: Coordinate altitude value must be numeric 1`] = `
+"[2mexpect([22m[31m[longitude, latitude, altitude][39m[2m).isValid3DCoordinate()[22m
 
-Expected input to not be a three element array with longitude between (-90 to 90), 
-        latitude between (-180 to 180), and numeric altitude.
+Coordinate altitude value must be numeric.
 
-Received:  [0, 0, 0]"
+Received:  [0, 0, true]"
+`;
+
+exports[`Error Snapshot Testing. Throws error: Coordinate must be an array of only three elments 1`] = `
+"expect([longitude, latitude, altitude]).isValid3DCoordinate()
+
+Coordinate must be an array of only three elments.
+
+Received:  [0, 0]"
 `;
 
-exports[`Error Snapshot Testing. Throws error: expect([0, 0]).isValid3DCoordinate 1`] = `
+exports[`Error Snapshot Testing. Throws error: Invalid input to matcher 1`] = `
 "expect([longitude, latitude, altitude]).isValid3DCoordinate()
 
 Coordinate must be an array of only three elments.
 
 Received:  [0, 0]"
 `;
+
+exports[`Error Snapshot Testing. Throws error: Valid use case passes 1`] = `
+"expect([longitude, latitude, altitude]).not.isValid3DCoordinate()
+
+Expected input to not be a three element array with longitude between (-90 to 90), 
+        latitude between (-180 to 180), and numeric altitude.
+
+Received:  [0, 0, 0]"
+`;

tests/coordinates/isValid3DCoordinate.test.js

@@ -145,11 +145,19 @@ describe('Invalid Use Cases', () => {
 })
 
 describe('Error Snapshot Testing. Throws error:', () => {
-    test('expect([0, 0, 0]).not.isValid3DCoordinate', () => {
+    test('Valid use case passes', () => {
         expect(() => expect([0, 0, 0]).not.isValid3DCoordinate()).toThrowErrorMatchingSnapshot()
     })
 
-    test('expect([0, 0]).isValid3DCoordinate', () => {
+    test('Invalid input to matcher', () => {
         expect(() => expect([0, 0]).isValid3DCoordinate()).toThrowErrorMatchingSnapshot()
     })
+
+    test('Coordinate must be an array of only three elments', () => {
+        expect(() => expect([0, 0]).isValid3DCoordinate()).toThrowErrorMatchingSnapshot()
+    })
+
+    test('Coordinate altitude value must be numeric', () => {
+        expect(() => expect([0, 0, true]).isValid3DCoordinate()).toThrowErrorMatchingSnapshot()
+    })
 })