Use test-icons when matching hashbangs

Although one can use their stylesheet to fix incorrect icons, doing this
quickly becomes laborious when too many permutations are involved:

    [data-name*="-spec."][data-name$=".py"]::after,
    [data-name*="-test."][data-name$=".py"]::after,
    [data-name*="-specs."][data-name$=".py"]::after,
    [data-name*="-tests."][data-name$=".py"]::after{
        font: 17px file-icons;
        content: "\ea66";
        top: 3px;
    }

This commit is a stopgap for an oft-encountered scenario where tests are
given inconsistent icons because they contain hashbangs. Of course, this
only solves part of a much larger issue with package's inability to link
multiple icons to a language, as opposed to only one. That's better left
to a future rewrite, however.

Fixes: #812

CHANGELOG.md

@@ -16,9 +16,11 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Changed `brew-icon` to use Homebrew logo
 - `.m2` extension now associated with [Macaulay2][] instead of [Modula-2][]
 - `.cpc` extension now associated with [CpcdosC+][] instead of [Cartesian Perceptual Compression][CPC]
+- [[`#812`][]]: Hashbang strategy now recognises test-files
 - Renamed `Bazel` entry to `Starlark`
 - UnrealScript files now coloured grey
 
+[`#812`]:    https://github.com/file-icons/atom/issues/812
 [CPC]:       https://en.wikipedia.org/wiki/Cartesian_Perceptual_Compression
 [CpcdosC+]:  https://cpcdos.net/
 [Macaulay2]: https://en.wikipedia.org/wiki/Macaulay2

lib/service/strategies/hashbang-strategy.js

@@ -12,6 +12,24 @@ class HashbangStrategy extends HeaderStrategy {
 			name: "hashbangs",
 			priority: 5,
 		});
+		// HACK: Ad-hoc fix for tests with hashbangs (#812)
+		this.testIcons = new Map([
+			["coffee",  ".test.coffee"],
+			["go",      ".test.go"],
+			["haskell", ".test.hs"],
+			["js",      ".test.js"],
+			["perl",    ".t"],
+			["python",  ".test.py"],
+			["ruby",    ".test.rb"],
+			["rust",    ".test.rs"],
+			["sh",      "/t/1a.sh"],
+			["ts",      ".test.ts"],
+		].map(([name, ext]) => [
+			IconTables.matchLanguage(name),
+			"/" === ext[0]
+				? IconTables.matchPath(ext)
+				: IconTables.matchName(ext),
+		]));
 	}
 
 
@@ -34,6 +52,13 @@ class HashbangStrategy extends HeaderStrategy {
 
 		let result = IconTables.matchInterpreter(name);
 
+		// HACK: Remap icons of test-files containing hashbangs (#812)
+		if(result && this.testIcons.has(result)){
+			const icon = this.testIcons.get(result);
+			if(icon.match.test(icon.matchPath ? resource.path : resource.name))
+				return icon;
+		}
+
 		// Valid hashbang, unrecognised interpreter
 		if(!result){
 			const {executable} = resource;