diff --git a/src/lib/color.test.ts b/src/lib/color.test.ts
new file mode 100644
index 0000000..fbfd735
--- /dev/null
+++ b/src/lib/color.test.ts
@@ -0,0 +1,29 @@
+import {Color} from './color'
+
+describe('Color', () => {
+  test('fromLumaChromaHue', () => {
+    expect(Color.fromLumaChromaHue(0, 0, 0).toCSS()).toEqual('rgba(0, 0, 0, 1.00)')
+    expect(Color.fromLumaChromaHue(1, 0, 0).toCSS()).toEqual('rgba(255, 255, 255, 1.00)')
+
+    expect(Color.fromLumaChromaHue(0.5, 0, 30).toCSS()).toEqual('rgba(128, 128, 128, 1.00)')
+    expect(Color.fromLumaChromaHue(0.5, 0, 60).toCSS()).toEqual('rgba(128, 128, 128, 1.00)')
+
+    expect(Color.fromLumaChromaHue(0.5, 0.5, 0).toCSS()).toEqual('rgba(217, 89, 89, 1.00)')
+
+    expect(Color.fromLumaChromaHue(0.5, 1.0, 0).toCSS()).toEqual('rgba(255, 51, 51, 1.00)')
+    expect(Color.fromLumaChromaHue(0.5, 1.0, 60).toCSS()).toEqual('rgba(156, 156, 0, 1.00)')
+    expect(Color.fromLumaChromaHue(0.5, 1.0, 120).toCSS()).toEqual('rgba(0, 232, 0, 1.00)')
+    expect(Color.fromLumaChromaHue(0.5, 1.0, 180).toCSS()).toEqual('rgba(0, 204, 204, 1.00)')
+    expect(Color.fromLumaChromaHue(0.5, 1.0, 240).toCSS()).toEqual('rgba(99, 99, 255, 1.00)')
+    expect(Color.fromLumaChromaHue(0.5, 1.0, 300).toCSS()).toEqual('rgba(255, 23, 255, 1.00)')
+    expect(Color.fromLumaChromaHue(0.5, 1.0, 360).toCSS()).toEqual('rgba(255, 51, 51, 1.00)')
+  })
+
+  test('toCSS', () => {
+    expect(new Color().toCSS()).toEqual('rgba(0, 0, 0, 1.00)')
+    expect(new Color(1, 0, 0, 1).toCSS()).toEqual('rgba(255, 0, 0, 1.00)')
+    expect(new Color(0, 1, 0, 1).toCSS()).toEqual('rgba(0, 255, 0, 1.00)')
+    expect(new Color(0, 0, 1, 1).toCSS()).toEqual('rgba(0, 0, 255, 1.00)')
+    expect(new Color(0, 0, 1, 0.599).toCSS()).toEqual('rgba(0, 0, 255, 0.60)')
+  })
+})
diff --git a/src/lib/color.ts b/src/lib/color.ts
index f859d31..92dcce1 100644
--- a/src/lib/color.ts
+++ b/src/lib/color.ts
@@ -1,3 +1,5 @@
+import {clamp} from './math'
+
 export class Color {
   constructor(
     readonly r: number = 0,
@@ -7,6 +9,9 @@ export class Color {
   ) {}
 
   static fromLumaChromaHue(L: number, C: number, H: number) {
+    // 0 <= L <= 1
+    // 0 <= C <= 1
+    // 0 <= H <= 360
     // https://en.wikipedia.org/wiki/HSL_and_HSV#From_luma/chroma/hue
 
     const hPrime = H / 60
@@ -26,7 +31,7 @@ export class Color {
 
     const m = L - (0.3 * R1 + 0.59 * G1 + 0.11 * B1)
 
-    return new Color(R1 + m, G1 + m, B1 + m, 1.0)
+    return new Color(clamp(R1 + m, 0, 1), clamp(G1 + m, 0, 1), clamp(B1 + m, 0, 1), 1.0)
   }
 
   toCSS(): string {
diff --git a/src/lib/demangle-cpp.test.ts b/src/lib/demangle-cpp.test.ts
index ce6f5be..cd024f3 100644
--- a/src/lib/demangle-cpp.test.ts
+++ b/src/lib/demangle-cpp.test.ts
@@ -6,4 +6,8 @@ test('demangleCpp', () => {
   expect(demangleCpp('__ZNK7Support6ColorFeqERKS0_')).toBe(
     'Support::ColorF::operator==(Support::ColorF const&) const',
   )
+  // Running a second time to test the cache
+  expect(demangleCpp('__ZNK7Support6ColorFeqERKS0_')).toBe(
+    'Support::ColorF::operator==(Support::ColorF const&) const',
+  )
 })
diff --git a/src/lib/hash-params.test.ts b/src/lib/hash-params.test.ts
new file mode 100644
index 0000000..804221b
--- /dev/null
+++ b/src/lib/hash-params.test.ts
@@ -0,0 +1,27 @@
+import {getHashParams} from './hash-params'
+
+test('getHashParams', () => {
+  expect(getHashParams('')).toEqual({})
+  expect(getHashParams('#')).toEqual({})
+  expect(getHashParams('#title=hello')).toEqual({title: 'hello'})
+  expect(getHashParams('#localProfilePath=file:///tmp/file.js')).toEqual({
+    localProfilePath: 'file:///tmp/file.js',
+  })
+  expect(
+    getHashParams(
+      '#profileURL=https://raw.githubusercontent.com/jlfwong/speedscope/master/sample/profiles/speedscope/0.1.2/simple-sampled.speedscope.json',
+    ),
+  ).toEqual({
+    profileURL:
+      'https://raw.githubusercontent.com/jlfwong/speedscope/master/sample/profiles/speedscope/0.1.2/simple-sampled.speedscope.json',
+  })
+  expect(getHashParams('#title=hello&localProfilePath=file:///tmp/file.js')).toEqual({
+    title: 'hello',
+    localProfilePath: 'file:///tmp/file.js',
+  })
+  expect(getHashParams('#title=hello%20world')).toEqual({
+    title: 'hello world',
+  })
+  expect(getHashParams('#abc=bcd')).toEqual({})
+  expect(getHashParams('garbage')).toEqual({})
+})
diff --git a/src/lib/hash-params.ts b/src/lib/hash-params.ts
index 6a6e227..469e820 100644
--- a/src/lib/hash-params.ts
+++ b/src/lib/hash-params.ts
@@ -4,22 +4,22 @@ export interface HashParams {
   localProfilePath?: string
 }
 
-export function getHashParams(): HashParams {
+export function getHashParams(hashContents = window.location.hash): HashParams {
   try {
-    const hashContents = window.location.hash
     if (!hashContents.startsWith('#')) {
       return {}
     }
     const components = hashContents.substr(1).split('&')
     const result: HashParams = {}
     for (const component of components) {
-      const [key, value] = component.split('=')
+      let [key, value] = component.split('=')
+      value = decodeURIComponent(value)
       if (key === 'profileURL') {
-        result.profileURL = decodeURIComponent(value)
+        result.profileURL = value
       } else if (key === 'title') {
-        result.title = decodeURIComponent(value)
+        result.title = value
       } else if (key === 'localProfilePath') {
-        result.localProfilePath = decodeURIComponent(value)
+        result.localProfilePath = value
       }
     }
     return result