Dependabot 2.0: Add negative tests for tool names

This may help prevent confusion surrounding tool names being listed
in the documentation (like "pip-compile") that are invalid YAML values
and must instead be configured with a specific YAML (like "pip").

src/negative_test/dependabot-2.0/package-ecosystem-tool-name-not-yaml-value-elm-package.json

@@ -0,0 +1,12 @@
+{
+  "updates": [
+    {
+      "directory": "/",
+      "package-ecosystem": "elm-package",
+      "schedule": {
+        "interval": "monthly"
+      }
+    }
+  ],
+  "version": 2
+}

src/negative_test/dependabot-2.0/package-ecosystem-tool-name-not-yaml-value-hex.json

@@ -0,0 +1,12 @@
+{
+  "updates": [
+    {
+      "directory": "/",
+      "package-ecosystem": "hex",
+      "schedule": {
+        "interval": "monthly"
+      }
+    }
+  ],
+  "version": 2
+}

src/negative_test/dependabot-2.0/package-ecosystem-tool-name-not-yaml-value-pip-compile.json

@@ -0,0 +1,12 @@
+{
+  "updates": [
+    {
+      "directory": "/",
+      "package-ecosystem": "pip-compile",
+      "schedule": {
+        "interval": "monthly"
+      }
+    }
+  ],
+  "version": 2
+}

src/negative_test/dependabot-2.0/package-ecosystem-tool-name-not-yaml-value-pipenv.json

@@ -0,0 +1,12 @@
+{
+  "updates": [
+    {
+      "directory": "/",
+      "package-ecosystem": "pipenv",
+      "schedule": {
+        "interval": "monthly"
+      }
+    }
+  ],
+  "version": 2
+}

src/negative_test/dependabot-2.0/package-ecosystem-tool-name-not-yaml-value-pnpm.json

@@ -0,0 +1,12 @@
+{
+  "updates": [
+    {
+      "directory": "/",
+      "package-ecosystem": "pnpm",
+      "schedule": {
+        "interval": "monthly"
+      }
+    }
+  ],
+  "version": 2
+}

src/negative_test/dependabot-2.0/package-ecosystem-tool-name-not-yaml-value-poetry.json

@@ -0,0 +1,12 @@
+{
+  "updates": [
+    {
+      "directory": "/",
+      "package-ecosystem": "poetry",
+      "schedule": {
+        "interval": "monthly"
+      }
+    }
+  ],
+  "version": 2
+}

src/negative_test/dependabot-2.0/package-ecosystem-tool-name-not-yaml-value-yarn.json

@@ -0,0 +1,12 @@
+{
+  "updates": [
+    {
+      "directory": "/",
+      "package-ecosystem": "yarn",
+      "schedule": {
+        "interval": "monthly"
+      }
+    }
+  ],
+  "version": 2
+}