diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index bf5e786e4..640c2e87e 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -45,7 +45,7 @@ To run tests, run
 
 To run a specific test, run
 
-    npm run test fixture001
+    npm run test build/fixture001
 
 ## Testing and debugging the extension
 
diff --git a/README.md b/README.md
index 012acd374..df294b4df 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,8 @@
 [![Average time to resolve an issue](https://isitmaintained.com/badge/resolution/James-Yu/LaTeX-Workshop.svg)](https://github.com/James-Yu/LaTeX-Workshop/issues)
 [![Percentage of issues still open](https://isitmaintained.com/badge/open/James-Yu/LaTeX-Workshop.svg)](https://github.com/James-Yu/LaTeX-Workshop/issues)
 
+[![TeX Live on Windows](https://github.com/James-Yu/LaTeX-Workshop/workflows/TeX%20Live%20on%20Windows/badge.svg)](https://github.com/James-Yu/LaTeX-Workshop/actions?query=workflow%3A%22TeX+Live+on+Windows%22) [![TeX Live on macOS](https://github.com/James-Yu/LaTeX-Workshop/workflows/TeX%20Live%20on%20macOS/badge.svg)](https://github.com/James-Yu/LaTeX-Workshop/actions?query=workflow%3A%22TeX+Live+on+macOS%22) [![TeX Live on Linux](https://github.com/James-Yu/LaTeX-Workshop/workflows/TeX%20Live%20on%20Linux/badge.svg)](https://github.com/James-Yu/LaTeX-Workshop/actions?query=workflow%3A%22TeX+Live+on+Linux%22) [![Docker on Linux](https://github.com/James-Yu/LaTeX-Workshop/workflows/Docker%20on%20Linux/badge.svg)](https://github.com/James-Yu/LaTeX-Workshop/actions?query=workflow%3A%22Docker+on+Linux%22)
+
 LaTeX Workshop is an extension for [Visual Studio Code](https://code.visualstudio.com/), aiming to provide core features for LaTeX typesetting with Visual Studio Code. It also has a sibling extension, [LaTeX Utilities](https://marketplace.visualstudio.com/items?itemName=tecosaur.latex-utilities), providing extra features.
 
 This project won't be successful without contributions from the community, especially the current and past key contributors:
diff --git a/src/components/manager.ts b/src/components/manager.ts
index 1711a4835..f1147b490 100644
--- a/src/components/manager.ts
+++ b/src/components/manager.ts
@@ -56,9 +56,11 @@ export class Manager {
         this.initiatePdfWatcher()
     }
 
-    /* Returns the output directory developed according to the input tex path
-       and 'latex.outDir' config. If undefined is passed in, the default root
-       file is used. If there is not root file, './' is output. */
+    /**
+     * Returns the output directory developed according to the input tex path
+     * and 'latex.outDir' config. If undefined is passed in, the default root
+     * file is used. If there is not root file, './' is output.
+     */
     getOutDir(texPath?: string) {
         if (texPath === undefined) {
             texPath = this.rootFile
@@ -300,9 +302,11 @@ export class Manager {
         return undefined
     }
 
-    /* This function returns a string array which holds all imported tex files
-       from the given `file`. If it is undefined, this function traces from the
-       root file, or return empty array if root is undefined */
+    /**
+     * This function returns a string array which holds all imported tex files
+     * from the given `file`. If it is undefined, this function traces from the
+     * root file, or return empty array if root is undefined
+     */
     getIncludedTeX(file?: string, includedTeX: string[] = []) {
         if (file === undefined) {
             file = this.rootFile
@@ -350,13 +354,15 @@ export class Manager {
         return micromatch.some(file, globsToIgnore, { format } as any)
     }
 
-    /* This function is called when a root file is found or a watched file is
-       changed (in vscode or externally). It searches the subfiles, including
-       \input siblings, bib files, and related fls file to construct a file
-       dependency data structure in `this.cachedContent`. Noted that only the
-       provided `file` is re-parsed, together with any new files that were not
-       previously watched/considered. Since this function is called upon content
-       changes, this lazy loading should be fine. */
+    /**
+     * This function is called when a root file is found or a watched file is
+     * changed (in vscode or externally). It searches the subfiles, including
+     * \input siblings, bib files, and related fls file to construct a file
+     * dependency data structure in `this.cachedContent`. Noted that only the
+     * provided `file` is re-parsed, together with any new files that were not
+     * previously watched/considered. Since this function is called upon content
+     * changes, this lazy loading should be fine.
+     */
     parseFileAndSubs(file: string, onChange: boolean = false) {
         if (this.isExcluded(file)) {
             this.extension.logger.addLogMessage(`Ignoring ${file}`)
@@ -380,8 +386,10 @@ export class Manager {
     }
 
     private cachedFullContent: string | undefined
-    /* This function returns the flattened content from the given file,
-       typically the root file. */
+    /**
+     * This function returns the flattened content from the given file,
+     * typically the root file.
+     */
     getContent(file?: string, fileTrace: string[] = []): string {
         // Here we make a copy, so that the tree structure of tex dependency
         // Can be maintained. For instance, main -> s1 and s2, both of which
@@ -527,10 +535,12 @@ export class Manager {
         }
     }
 
-    /* This function parses the content of a fls attached to the given base tex
-       file. All input files are considered as included subfiles/non-tex files,
-       and all output files will be check if there are aux files related. If so,
-       the aux files are parsed for any possible bib file. */
+    /**
+     * This function parses the content of a fls attached to the given base tex
+     * file. All input files are considered as included subfiles/non-tex files,
+     * and all output files will be check if there are aux files related. If so,
+     * the aux files are parsed for any possible bib file.
+     */
     parseFlsFile(baseFile: string) {
         this.extension.logger.addLogMessage('Parse fls file.')
         const rootDir = path.dirname(baseFile)
@@ -776,7 +786,9 @@ export class Manager {
         this.extension.completer.input.getGraphicsPath(file)
     }
 
-    // This function updates all completers upon tex-file changes, or active file content is changed.
+    /**
+     * This function updates all completers upon tex-file changes, or active file content is changed.
+     */
     async updateCompleter(file: string, content: string) {
         this.extension.completer.citation.update(file, content)
         // Here we use this delay config. Otherwise, multiple updates may run
diff --git a/src/utils/utils.ts b/src/utils/utils.ts
index 9b2cfe69e..e7eaf08c7 100644
--- a/src/utils/utils.ts
+++ b/src/utils/utils.ts
@@ -47,7 +47,9 @@ export function getLongestBalancedString(s: string): string {
     return s.substring(0, i)
 }
 
-// Given an input file determine its full path using the prefixes dirs
+/**
+ * Given an input file determine its full path using the prefixes dirs
+ */
 export function resolveFile(dirs: string[], inputFile: string, suffix: string = '.tex'): string | undefined {
     if (inputFile.startsWith('/')) {
         dirs.unshift('')
@@ -83,18 +85,21 @@ export function convertFilenameEncoding(filePath: string): string | undefined {
     return undefined
 }
 
-// prefix that server.ts uses to distiguish requests on pdf files from others.
-// We use '.' because it is not converted by encodeURIComponent and other functions.
-// See https://stackoverflow.com/questions/695438/safe-characters-for-friendly-url
-// See https://tools.ietf.org/html/rfc3986#section-2.3
-
+/**
+ * Prefix that server.ts uses to distiguish requests on pdf files from others.
+ * We use '.' because it is not converted by encodeURIComponent and other functions.
+ * See https://stackoverflow.com/questions/695438/safe-characters-for-friendly-url
+ * See https://tools.ietf.org/html/rfc3986#section-2.3
+ */
 export const pdfFilePrefix = 'pdf..'
 
-// We encode the path with base64url after calling encodeURIComponent.
-// The reason not using base64url directly is that we are not sure that
-// encodeURIComponent, unescape, and btoa trick is valid on node.js.
-// See https://en.wikipedia.org/wiki/Base64#URL_applications
-// See https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/btoa#Unicode_strings
+/**
+ * We encode the path with base64url after calling encodeURIComponent.
+ * The reason not using base64url directly is that we are not sure that
+ * encodeURIComponent, unescape, and btoa trick is valid on node.js.
+ * - https://en.wikipedia.org/wiki/Base64#URL_applications
+ * - https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/btoa#Unicode_strings
+ */
 export function encodePath(url: string) {
     const s = encodeURIComponent(url)
     const b64 = Buffer.from(s).toString('base64')
diff --git a/test/README.md b/test/README.md
index 176f70cbe..b705b4931 100644
--- a/test/README.md
+++ b/test/README.md
@@ -1,5 +1,5 @@
 ## Overview
 
-### Tests of building TeX files
+### Executing tests
 
-We start a new VS Code instance each `fixture` directory in `fixtures/build`, and execute an appropriate test defined in `build.test.ts` while skipping other tests not related to the directory. Each test tries to build a TeX file in the directory. If a PDF file is not generated, the test fails. With this approach, we can debug the extension by opening a TeX file in the `fixture` directory if the test fails.
+We start a new VS Code instance each `fixture` directory in `fixtures/build/` and `fixtures/viewer/`, and execute an appropriate test defined in `build.test.ts` while skipping other tests not related to the directory. Each test tries to build a TeX file in the directory. If a PDF file is not generated, the test fails. With this approach, we can debug the extension by opening a TeX file in the `fixture` directory if the test fails.
diff --git a/viewer/README.md b/viewer/README.md
index 18c0fe592..1ccfb86cd 100644
--- a/viewer/README.md
+++ b/viewer/README.md
@@ -2,7 +2,7 @@
 
 The pdf viewer is based on [PDF.js](https://mozilla.github.io/pdf.js/) by Mozilla Foundation. Files are from the [prebuilt download version](https://mozilla.github.io/pdf.js/getting_started/#download). The reason we do not use `web/pdf_viewer.js` from `pdfjs-dist` package is that `pdf_viewer.js` does not provide features we need. `pdf_viewer.js` is much simpler than `viewer.js`. See [link](https://github.com/mozilla/pdf.js/issues/9318).
 
-Mozilla [asks](https://mozilla.github.io/pdf.js/getting_started/) web developers to reskin `viewer.html` because Firefox users would think bugs of the viewer on the web site are ones of Firefox and would report them to the pdf.js team. See [link](https://github.com/mozilla/pdf.js/issues/5609). Our usage does not cause such a problem.
+Mozilla [asks](https://mozilla.github.io/pdf.js/getting_started/) web developers to reskin `viewer.html` because Firefox users would think bugs of the viewer on the web site are ones of Firefox and would report them to the PDF.js team. See [link](https://github.com/mozilla/pdf.js/issues/5609). Our usage does not cause such a problem.
 
 We provide additional features by setting up new event listeners in `latexworkshop.js` for DOM objects in `viewer.html`. We do not and should not override functions defined by PDF.js.
 
@@ -20,7 +20,7 @@ When opening a PDF file. In order.
 4. pagesinit
 5. documentloaded
 7. documentinit
-8. PDF da551cb... [...] (PDF.js: 2.2.228) (a log message is output)
+8. `PDF da551cb... [...] (PDF.js: 2.2.228)` (a log message is output)
 9. pagerendered
 1. pagesloaded
 1. textlayerrendered
@@ -32,7 +32,7 @@ When reloading a PDF file. In order.
 1. pagesinit
 1. documentloaded
 1. documentinit
-1. PDF da551cb... [...] (PDF.js: 2.2.228) (a log message is output)
+1. `PDF da551cb... [...] (PDF.js: 2.2.228)` (a log message is output)
 1. pagerendered
 1. pagesloaded
 1. textlayerrendered