Move spec files back out of spec/javascripts

- Jasmine gem allows us to specify a path to jasmine.yml via ENV

[finish #58126010]

spec/core/matchers/toBeNullSpec.js

@@ -0,0 +1,17 @@
+describe("toBeNull", function() {
+  it("passes for null", function() {
+    var matcher = j$.matchers.toBeNull(),
+      result;
+
+    result = matcher.compare(null);
+    expect(result.pass).toBe(true);
+  });
+
+  it("fails for non-null", function() {
+    var matcher = j$.matchers.toBeNull(),
+      result;
+
+    result = matcher.compare('foo');
+    expect(result.pass).toBe(false);
+  });
+});