Add math run and fraction

src/file/paragraph/math/fraction/math-fraction.spec.ts

@@ -0,0 +1,45 @@
+import { expect } from "chai";
+
+import { Formatter } from "export/formatter";
+
+import { MathDenominator } from "./math-denominator";
+import { MathFraction } from "./math-fraction";
+import { MathNumerator } from "./math-numerator";
+
+describe("MathFraction", () => {
+    describe("#constructor()", () => {
+        it("should create a MathFraction with correct root key", () => {
+            const mathFraction = new MathFraction({
+                numerator: new MathNumerator("2"),
+                denominator: new MathDenominator("2"),
+            });
+            const tree = new Formatter().format(mathFraction);
+            expect(tree).to.deep.equal({
+                "m:f": [
+                    {
+                        "m:num": [
+                            {
+                                "m:r": [
+                                    {
+                                        "m:t": ["2"],
+                                    },
+                                ],
+                            },
+                        ],
+                    },
+                    {
+                        "m:den": [
+                            {
+                                "m:r": [
+                                    {
+                                        "m:t": ["2"],
+                                    },
+                                ],
+                            },
+                        ],
+                    },
+                ],
+            });
+        });
+    });
+});