diff --git a/web/package.json b/web/package.json
index e9bc540d2..021847d7c 100644
--- a/web/package.json
+++ b/web/package.json
@@ -28,6 +28,7 @@
         "bootstrap": "lerna bootstrap --hoist",
         "build": "lerna run build --stream",
         "buildProduction": "lerna run build --stream -- --mode=production",
-        "demo": "lerna run --scope ruffle-demo serve --stream"
+        "demo": "lerna run --scope ruffle-demo serve --stream",
+        "test": "lerna run test --stream"
     }
 }
diff --git a/web/packages/core/package-lock.json b/web/packages/core/package-lock.json
new file mode 100644
index 000000000..1e4198035
--- /dev/null
+++ b/web/packages/core/package-lock.json
@@ -0,0 +1,986 @@
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+            "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+            "dev": true,
+            "requires": {
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+            }
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+            "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+            "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
+            "dev": true
+        },
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+            "dev": true,
+            "requires": {
+                "has-flag": "^3.0.0"
+            }
+        },
+        "to-regex-range": {
+            "version": "5.0.1",
+            "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
+            "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
+            "dev": true,
+            "requires": {
+                "is-number": "^7.0.0"
+            }
+        },
+        "type-detect": {
+            "version": "4.0.8",
+            "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+            "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+            "dev": true
+        },
+        "which": {
+            "version": "1.3.1",
+            "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+            "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+            "dev": true,
+            "requires": {
+                "isexe": "^2.0.0"
+            }
+        },
+        "which-module": {
+            "version": "2.0.0",
+            "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+            "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+            "dev": true
+        },
+        "wide-align": {
+            "version": "1.1.3",
+            "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+            "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+            "dev": true,
+            "requires": {
+                "string-width": "^1.0.2 || 2"
+            }
+        },
+        "wrap-ansi": {
+            "version": "5.1.0",
+            "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+            "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+            "dev": true,
+            "requires": {
+                "ansi-styles": "^3.2.0",
+                "string-width": "^3.0.0",
+                "strip-ansi": "^5.0.0"
+            },
+            "dependencies": {
+                "ansi-regex": {
+                    "version": "4.1.0",
+                    "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+                    "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+                    "dev": true
+                },
+                "string-width": {
+                    "version": "3.1.0",
+                    "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+                    "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+                    "dev": true,
+                    "requires": {
+                        "emoji-regex": "^7.0.1",
+                        "is-fullwidth-code-point": "^2.0.0",
+                        "strip-ansi": "^5.1.0"
+                    }
+                },
+                "strip-ansi": {
+                    "version": "5.2.0",
+                    "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+                    "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+                    "dev": true,
+                    "requires": {
+                        "ansi-regex": "^4.1.0"
+                    }
+                }
+            }
+        },
+        "wrappy": {
+            "version": "1.0.2",
+            "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+            "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+            "dev": true
+        },
+        "y18n": {
+            "version": "4.0.0",
+            "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+            "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+            "dev": true
+        },
+        "yargs": {
+            "version": "13.3.2",
+            "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+            "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
+            "dev": true,
+            "requires": {
+                "cliui": "^5.0.0",
+                "find-up": "^3.0.0",
+                "get-caller-file": "^2.0.1",
+                "require-directory": "^2.1.1",
+                "require-main-filename": "^2.0.0",
+                "set-blocking": "^2.0.0",
+                "string-width": "^3.0.0",
+                "which-module": "^2.0.0",
+                "y18n": "^4.0.0",
+                "yargs-parser": "^13.1.2"
+            },
+            "dependencies": {
+                "ansi-regex": {
+                    "version": "4.1.0",
+                    "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+                    "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+                    "dev": true
+                },
+                "string-width": {
+                    "version": "3.1.0",
+                    "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+                    "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+                    "dev": true,
+                    "requires": {
+                        "emoji-regex": "^7.0.1",
+                        "is-fullwidth-code-point": "^2.0.0",
+                        "strip-ansi": "^5.1.0"
+                    }
+                },
+                "strip-ansi": {
+                    "version": "5.2.0",
+                    "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+                    "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+                    "dev": true,
+                    "requires": {
+                        "ansi-regex": "^4.1.0"
+                    }
+                }
+            }
+        },
+        "yargs-parser": {
+            "version": "13.1.2",
+            "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+            "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
+            "dev": true,
+            "requires": {
+                "camelcase": "^5.0.0",
+                "decamelize": "^1.2.0"
+            }
+        },
+        "yargs-unparser": {
+            "version": "1.6.0",
+            "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
+            "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+            "dev": true,
+            "requires": {
+                "flat": "^4.1.0",
+                "lodash": "^4.17.15",
+                "yargs": "^13.3.0"
+            }
+        }
+    }
+}
diff --git a/web/packages/core/package.json b/web/packages/core/package.json
index 75df04737..9cb3bf61c 100644
--- a/web/packages/core/package.json
+++ b/web/packages/core/package.json
@@ -4,6 +4,11 @@
     "description": "Core bindings for Ruffle",
     "private": true,
     "scripts": {
-        "build": "webpack"
+        "build": "webpack",
+        "test": "mocha"
+    },
+    "devDependencies": {
+        "chai": "^4.2.0",
+        "mocha": "^7.1.2"
     }
 }
diff --git a/web/packages/core/test/.eslintrc.json b/web/packages/core/test/.eslintrc.json
new file mode 100644
index 000000000..4668ae79f
--- /dev/null
+++ b/web/packages/core/test/.eslintrc.json
@@ -0,0 +1,5 @@
+{
+    "env": {
+        "mocha": true
+    }
+}
diff --git a/web/packages/core/test/version.js b/web/packages/core/test/version.js
new file mode 100644
index 000000000..279cefdf8
--- /dev/null
+++ b/web/packages/core/test/version.js
@@ -0,0 +1,219 @@
+const { assert } = require("chai");
+const { Version } = require("../src/version");
+
+// Each row should be a list of compatible versions.
+// Earlier entries in a row should be "greater than" later entries in the same row.
+// Earlier rows should be "greater than" later rows.
+// Rows should be incompatible with other rows.
+const testMatrix = [
+    ["3.6-pre1", "3.5.4", "3.2.3", "3"],
+    ["2.5", "2.2.6", "2.2.4", "2.2.3"],
+    [
+        "1",
+        "1-rc.1",
+        "1-beta.11",
+        "1-beta.2",
+        "1-beta",
+        "1-alpha.beta",
+        "1-alpha.1",
+        "1-alpha",
+    ],
+    ["0.1.2", "0.1.1-dev", "0.1"],
+    ["0.0.2", "0.0.2-dev", "0.0.2+build"],
+    ["0.0.1", "0.0.1-dev", "0.0.1-5", "0.0.1-2"],
+];
+
+describe("Version", function () {
+    describe("#from_semver()", function () {
+        it("should parse valid semver strings", function () {
+            assert.deepEqual(
+                Version.from_semver("1.2"),
+                new Version(1, 2, 0, undefined, undefined)
+            );
+            assert.deepEqual(
+                Version.from_semver("1.2.3"),
+                new Version(1, 2, 3, undefined, undefined)
+            );
+            assert.deepEqual(
+                Version.from_semver("1.2.3-pr"),
+                new Version(1, 2, 3, ["pr"], undefined)
+            );
+            assert.deepEqual(
+                Version.from_semver("1.2.3-pr1.pr2"),
+                new Version(1, 2, 3, ["pr1", "pr2"], undefined)
+            );
+            assert.deepEqual(
+                Version.from_semver("1.2.3+build"),
+                new Version(1, 2, 3, undefined, ["build"])
+            );
+            assert.deepEqual(
+                Version.from_semver("1.2.3+build1.build2"),
+                new Version(1, 2, 3, undefined, ["build1", "build2"])
+            );
+            assert.deepEqual(
+                Version.from_semver("1-pr1.pr2+build1.build2"),
+                new Version(1, 0, 0, ["pr1", "pr2"], ["build1", "build2"])
+            );
+        });
+    });
+
+    describe("#is_compatible_with()", function () {
+        it("is compatible with similar versions", function () {
+            for (let test of testMatrix) {
+                for (let a of test) {
+                    for (let b of test) {
+                        assert.isOk(
+                            Version.from_semver(a).is_compatible_with(
+                                Version.from_semver(b)
+                            ),
+                            `${a} is compatible with ${b}`
+                        );
+                    }
+                }
+            }
+        });
+        it("is not compatible with other versions", function () {
+            for (let test of testMatrix) {
+                for (let a of test) {
+                    for (let otherTest of testMatrix) {
+                        if (test === otherTest) continue;
+                        for (let b of otherTest) {
+                            assert.isNotOk(
+                                Version.from_semver(a).is_compatible_with(
+                                    Version.from_semver(b)
+                                ),
+                                `${a} is not compatible with ${b}`
+                            );
+                        }
+                    }
+                }
+            }
+        });
+    });
+
+    describe("#has_precedence_over()", function () {
+        it("returns true when it should", function () {
+            const tests = testMatrix.flat();
+            for (let a = 0; a < tests.length; a++) {
+                for (let b = a + 1; b < tests.length; b++) {
+                    if (
+                        tests[a].indexOf("+") > -1 ||
+                        tests[b].indexOf("+") > -1
+                    ) {
+                        // Skip "builds" for purposes of this test.
+                        continue;
+                    }
+                    assert.isOk(
+                        Version.from_semver(tests[a]).has_precedence_over(
+                            Version.from_semver(tests[b])
+                        ),
+                        `${tests[a]} has precedence over ${tests[b]}`
+                    );
+                }
+            }
+        });
+        it("returns false when it should", function () {
+            const tests = testMatrix.flat().reverse();
+            for (let a = 0; a < tests.length; a++) {
+                for (let b = a + 1; b < tests.length; b++) {
+                    if (
+                        tests[a].indexOf("+") > -1 ||
+                        tests[b].indexOf("+") > -1
+                    ) {
+                        // Skip "builds" for purposes of this test.
+                        continue;
+                    }
+                    assert.isNotOk(
+                        Version.from_semver(tests[a]).has_precedence_over(
+                            Version.from_semver(tests[b])
+                        ),
+                        `${tests[a]} doesn't have precedence over ${tests[b]}`
+                    );
+                }
+            }
+        });
+    });
+
+    describe("#is_equal()", function () {
+        it("returns true when it should", function () {
+            const tests = testMatrix.flat();
+            for (let version of tests) {
+                assert.isOk(
+                    Version.from_semver(version).is_equal(
+                        Version.from_semver(version)
+                    ),
+                    `${version} is equal to itself`
+                );
+            }
+        });
+        it("returns false when it should", function () {
+            const tests = testMatrix.flat().reverse();
+            for (let a = 0; a < tests.length; a++) {
+                for (let b = a + 1; b < tests.length; b++) {
+                    if (
+                        tests[a].indexOf("+") > -1 ||
+                        tests[b].indexOf("+") > -1 ||
+                        tests[a].indexOf("-") > -1 ||
+                        tests[b].indexOf("-") > -1
+                    ) {
+                        // Skip "builds" and "identifiers" for purposes of this test.
+                        continue;
+                    }
+                    assert.isNotOk(
+                        Version.from_semver(tests[a]).is_equal(
+                            Version.from_semver(tests[b])
+                        ),
+                        `${tests[a]} does not equal ${tests[b]}`
+                    );
+                }
+            }
+        });
+    });
+
+    describe("#is_stable_or_compatible_prerelease()", function () {
+        it("returns true for own versions", function () {
+            const tests = testMatrix.flat();
+            for (let version of tests) {
+                assert.isOk(
+                    Version.from_semver(
+                        version
+                    ).is_stable_or_compatible_prerelease(
+                        Version.from_semver(version)
+                    ),
+                    `${version} is compatible with itself`
+                );
+            }
+        });
+        it("returns true for compatible pre-releases", function () {
+            const tests = ["1.2.3", "1.2.3-alpha", "1.2.3-beta1.build2"];
+            for (let a of tests) {
+                for (let b of tests) {
+                    assert.isOk(
+                        Version.from_semver(
+                            a
+                        ).is_stable_or_compatible_prerelease(
+                            Version.from_semver(b)
+                        ),
+                        `${a} is compatible with ${b}`
+                    );
+                }
+            }
+        });
+        it("returns false for incompatible pre-releases", function () {
+            const tests = ["1-dev", "1.2-alpha", "1.2.3-beta1.build2"];
+            for (let a of tests) {
+                for (let b of tests) {
+                    if (a === b) continue;
+                    assert.isNotOk(
+                        Version.from_semver(
+                            a
+                        ).is_stable_or_compatible_prerelease(
+                            Version.from_semver(b)
+                        ),
+                        `${a} is not compatible with ${b}`
+                    );
+                }
+            }
+        });
+    });
+});