Add test runner for RippleAPI, begin to break up large test file

test/api/xrpToDrops/index.ts

@@ -0,0 +1,104 @@
+import assert from 'assert-diff'
+import BigNumber from 'bignumber.js'
+import { TestSuite } from '../utils'
+
+/**
+ * Every test suite exports their tests in the default object.
+ * - Check out the "TestSuite" type for documentation on the interface.
+ * - Check out "test/api/index.ts" for more information about the test runner.
+ */
+export default <TestSuite>{
+  'works with a typical amount': function(api) {
+    const drops = api.xrpToDrops('2')
+    assert.strictEqual(drops, '2000000', '2 XRP equals 2 million drops')
+  },
+  'works with fractions': function(api) {
+    let drops = api.xrpToDrops('3.456789')
+    assert.strictEqual(drops, '3456789', '3.456789 XRP equals 3,456,789 drops')
+    drops = api.xrpToDrops('3.400000')
+    assert.strictEqual(drops, '3400000', '3.400000 XRP equals 3,400,000 drops')
+    drops = api.xrpToDrops('0.000001')
+    assert.strictEqual(drops, '1', '0.000001 XRP equals 1 drop')
+    drops = api.xrpToDrops('0.0000010')
+    assert.strictEqual(drops, '1', '0.0000010 XRP equals 1 drop')
+  },
+  'works with zero': function(api) {
+    let drops = api.xrpToDrops('0')
+    assert.strictEqual(drops, '0', '0 XRP equals 0 drops')
+    drops = api.xrpToDrops('-0') // negative zero is equivalent to zero
+    assert.strictEqual(drops, '0', '-0 XRP equals 0 drops')
+    drops = api.xrpToDrops('0.000000')
+    assert.strictEqual(drops, '0', '0.000000 XRP equals 0 drops')
+    drops = api.xrpToDrops('0.0000000')
+    assert.strictEqual(drops, '0', '0.0000000 XRP equals 0 drops')
+  },
+  'works with a negative value': function(api) {
+    const drops = api.xrpToDrops('-2')
+    assert.strictEqual(drops, '-2000000', '-2 XRP equals -2 million drops')
+  },
+  'works with a value ending with a decimal point': function(api) {
+    let drops = api.xrpToDrops('2.')
+    assert.strictEqual(drops, '2000000', '2. XRP equals 2000000 drops')
+    drops = api.xrpToDrops('-2.')
+    assert.strictEqual(drops, '-2000000', '-2. XRP equals -2000000 drops')
+  },
+  'works with BigNumber objects': function(api) {
+    let drops = api.xrpToDrops(new BigNumber(2))
+    assert.strictEqual(
+      drops,
+      '2000000',
+      '(BigNumber) 2 XRP equals 2 million drops'
+    )
+    drops = api.xrpToDrops(new BigNumber(-2))
+    assert.strictEqual(
+      drops,
+      '-2000000',
+      '(BigNumber) -2 XRP equals -2 million drops'
+    )
+  },
+  'works with a number': function(api) {
+    // This is not recommended. Use strings or BigNumber objects to avoid precision errors.
+    let drops = api.xrpToDrops(2)
+    assert.strictEqual(
+      drops,
+      '2000000',
+      '(number) 2 XRP equals 2 million drops'
+    )
+    drops = api.xrpToDrops(-2)
+    assert.strictEqual(
+      drops,
+      '-2000000',
+      '(number) -2 XRP equals -2 million drops'
+    )
+  },
+  'throws with an amount with too many decimal places': function(api) {
+    assert.throws(() => {
+      api.xrpToDrops('1.1234567')
+    }, /has too many decimal places/)
+    assert.throws(() => {
+      api.xrpToDrops('0.0000001')
+    }, /has too many decimal places/)
+  },
+  'throws with an invalid value': function(api) {
+    assert.throws(() => {
+      api.xrpToDrops('FOO')
+    }, /invalid value/)
+    assert.throws(() => {
+      api.xrpToDrops('1e-7')
+    }, /invalid value/)
+    assert.throws(() => {
+      api.xrpToDrops('2,0')
+    }, /invalid value/)
+    assert.throws(() => {
+      api.xrpToDrops('.')
+    }, /xrpToDrops: invalid value '\.', should be a BigNumber or string-encoded number\./)
+  },
+  'throws with an amount more than one decimal point': function(api) {
+    assert.throws(() => {
+      api.xrpToDrops('1.0.0')
+    }, /xrpToDrops: invalid value '1\.0\.0'/)
+    assert.throws(() => {
+      api.xrpToDrops('...')
+    }, /xrpToDrops: invalid value '\.\.\.'/)
+  }
+}