Include function names in pretty printer output

This helps make matcher errors and spy strategy mismatch errors easier
to understand in cases where the difference involves expecting one
function but getting a different one.

lib/jasmine-core/jasmine.js

@@ -7761,7 +7761,11 @@ getJasmineRequireObj().makePrettyPrinter = function(j$) {
         } else if (value instanceof RegExp) {
           this.emitScalar(value.toString());
         } else if (typeof value === 'function') {
-          this.emitScalar('Function');
+          if (value.name) {
+            this.emitScalar(`Function '${value.name}'`);
+          } else {
+            this.emitScalar('Function');
+          }
         } else if (j$.isDomNode(value)) {
           if (value.tagName) {
             this.emitDomElement(value);

spec/core/PrettyPrintSpec.js

@@ -164,7 +164,7 @@ describe('PrettyPrinter', function() {
       "Object({ foo: 'bar', baz: 3, nullValue: null, undefinedValue: undefined })"
     );
     expect(pp({ foo: function() {}, bar: [1, 2, 3] })).toEqual(
-      'Object({ foo: Function, bar: [ 1, 2, 3 ] })'
+      "Object({ foo: Function 'foo', bar: [ 1, 2, 3 ] })"
     );
   });
 
@@ -450,7 +450,7 @@ describe('PrettyPrinter', function() {
     };
 
     expect(pp(objFromOtherContext)).toEqual(
-      "Object({ foo: 'bar', toString: Function })"
+      "Object({ foo: 'bar', toString: Function 'toString' })"
     );
   });
 
@@ -477,6 +477,17 @@ describe('PrettyPrinter', function() {
     expect(pp(a)).toEqual('<anonymous>({  })');
   });
 
+  it('stringifies functions with names', function() {
+    const pp = jasmineUnderTest.makePrettyPrinter();
+    expect(pp(foo)).toEqual("Function 'foo'");
+    function foo() {}
+  });
+
+  it('stringifies functions without names', function() {
+    const pp = jasmineUnderTest.makePrettyPrinter();
+    expect(pp(function() {})).toEqual('Function');
+  });
+
   it('should handle objects with null prototype', function() {
     const pp = jasmineUnderTest.makePrettyPrinter();
     const obj = Object.create(null);

spec/core/matchers/toEqualSpec.js

@@ -458,9 +458,9 @@ describe('toEqual', function() {
   });
 
   it('reports mismatches between Functions', function() {
-    const actual = { x: function() {} },
+    const actual = { x: function() {} };
-      expected = { x: function() {} },
+    const expected = { x: function() {} };
-      message = 'Expected $.x = Function to equal Function.';
+    const message = "Expected $.x = Function 'x' to equal Function 'x'.";
 
     expect(compareEquals(actual, expected).message).toEqual(message);
   });

src/core/PrettyPrinter.js

@@ -35,7 +35,11 @@ getJasmineRequireObj().makePrettyPrinter = function(j$) {
         } else if (value instanceof RegExp) {
           this.emitScalar(value.toString());
         } else if (typeof value === 'function') {
-          this.emitScalar('Function');
+          if (value.name) {
+            this.emitScalar(`Function '${value.name}'`);
+          } else {
+            this.emitScalar('Function');
+          }
         } else if (j$.isDomNode(value)) {
           if (value.tagName) {
             this.emitDomElement(value);