Parse the d operation

1 files changed, 35 insertions, 0 deletions

diff --git a/__tests__/parser.test.js b/__tests__/parser.test.js
new file mode 100644
index 0000000..004e18b
--- /dev/null
+++ b/__tests__/parser.test.js
@@ -0,0 +1,35 @@
+const { parse } = require('../src/parser.js')
+
+describe('parse', () => {
+  it('parses a constant', () => {
+    expect(parse('5')).toEqual({ type: 'constant', value: 5 })
+  })
+
+  it('parses a simple die (1d6)', () => {
+    expect(parse('1d6')).toEqual({
+      type: 'd',
+      left: { type: 'constant', value: 1 },
+      right: { type: 'constant', value: 6 }
+    })
+  })
+
+  it('parses a simple die (10d42)', () => {
+    expect(parse('10d42')).toEqual({
+      type: 'd',
+      left: { type: 'constant', value: 10 },
+      right: { type: 'constant', value: 42 }
+    })
+  })
+
+  it('parses a compound die (1d2d3)', () => {
+    expect(parse('1d2d3')).toEqual({
+      type: 'd',
+      left: { type: 'constant', value: 1 },
+      right: {
+        type: 'd',
+        left: { type: 'constant', value: 2 },
+        right: { type: 'constant', value: 3 }
+      }
+    })
+  })
+})