Added infinity methods, with tests

spec/core/matchers/toBeNegativeInfinitySpec.js

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+describe("toBeNegativeInfinity", function() {
+  it("fails for anything that isn't -Infinity", function() {
+    var matcher = jasmineUnderTest.matchers.toBeNegativeInfinity(),
+      result;
+
+    result = matcher.compare(1);
+    expect(result.pass).toBe(false);
+
+    result = matcher.compare(Number.NaN);
+    expect(result.pass).toBe(false);
+
+    result = matcher.compare(null);
+    expect(result.pass).toBe(false);
+  });
+
+  it("has a custom message on failure", function() {
+    var matcher = jasmineUnderTest.matchers.toBeNegativeInfinity(),
+      result = matcher.compare(0);
+
+    expect(result.message()).toEqual("Expected 0 not to be -Infinity.")
+  });
+
+  it("succeeds for -Infinity", function() {
+    var matcher = jasmineUnderTest.matchers.toBeNegativeInfinity(),
+      result = matcher.compare(Number.NEGATIVE_INFINITY);
+
+    expect(result.pass).toBe(true);
+    expect(result.message).toEqual("Expected actual to be -Infinity.")
+  });
+
+});

spec/core/matchers/toBePositiveInfinitySpec.js

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+describe("toBePositiveInfinity", function() {
+  it("fails for anything that isn't Infinity", function() {
+    var matcher = jasmineUnderTest.matchers.toBePositiveInfinity(),
+      result;
+
+    result = matcher.compare(1);
+    expect(result.pass).toBe(false);
+
+    result = matcher.compare(Number.NaN);
+    expect(result.pass).toBe(false);
+
+    result = matcher.compare(null);
+    expect(result.pass).toBe(false);
+  });
+
+  it("has a custom message on failure", function() {
+    var matcher = jasmineUnderTest.matchers.toBePositiveInfinity(),
+      result = matcher.compare(0);
+
+    expect(result.message()).toEqual("Expected 0 not to be Infinity.")
+  });
+
+  it("succeeds for Infinity", function() {
+    var matcher = jasmineUnderTest.matchers.toBePositiveInfinity(),
+      result = matcher.compare(Number.POSITIVE_INFINITY);
+
+    expect(result.pass).toBe(true);
+    expect(result.message).toEqual("Expected actual to be Infinity.")
+  });
+
+});